Beginner's guide
The peptide compound guide
New to peptides? Here's every compound in the catalog explained in plain English — what it is, the pathway researchers study it in, and where it fits in the science. No biochemistry degree required, and nothing here is a health claim.
Peptide names look intimidating from the outside — a wall of acronyms. This guide strips that away. Below, each compound gets a short, plain-English card: what it actually is, how it works in everyday terms, and the area of science researchers study it in. No background needed — start with the quick glossary, then jump to whichever area you're curious about.
One important thing to understand before you read on: everything here describes these compounds as research reference materials, studied in laboratory and preclinical settings. This is educational information about the science — not medical advice, not dosing guidance, and not a claim that any compound treats or benefits any condition.
Peptide words, in plain English
- Peptide
- A tiny chain of amino acids — the same building blocks that make up proteins, just much smaller.
- Amino acid
- The individual links in that chain. Their order gives each peptide its shape and the way it behaves.
- Hormone
- A natural signaling molecule the body releases to tell other parts what to do — like a chemical text message between cells.
- Receptor
- A docking point on a cell. When the right molecule fits it, it works like an on-switch for some activity inside the cell.
- Blend
- Two or more compounds combined in one vial and studied together.
- Reconstitution
- Mixing a freeze-dried powder with a sterile liquid so it can be handled in the lab. See the reconstitution guide.
- Certificate of Analysis (COA)
- The independent lab report that proves what's actually in a batch and how pure it is. Always check it — here's how to read one.
- Research use only
- Everything here is sold as a reference material for laboratory research — not for use by people or animals.
New to peptides? The things people ask first
A quick pass through what trips up newcomers — units, mixing, labels, storage, and how ordering works. Skim these and the compound cards below will make a lot more sense.
Why does it come as a powder?
Peptides ship freeze-dried — as a dry powder — because they stay stable far longer that way. Before they're used in the lab, the powder is reconstituted: mixed with a sterile liquid to dissolve it. The reconstitution guide walks through it step by step.
What do I mix it with?
The standard liquid is bacteriostatic water — sterile water with a tiny amount of preservative so it keeps once opened. A few compounds use plain sterile water or a mild acetic-acid water instead. All are listed under Solvents & supplies below.
mg, mcg and IU — what do the units mean?
mg is milligrams and mcg (sometimes written µg) is micrograms — there are 1,000 mcg in 1 mg. IU means “international units,” a way of measuring the strength of certain compounds (like HGH or HCG) instead of their weight. The number in a product name, like “10mg,” is simply how much is in the vial.
What's a COA, and why does everyone mention it?
A Certificate of Analysis is an independent lab's report on one specific batch — what it actually is and how pure it is. It's the main way to know a vial matches its label. For lots we publish, the report is yours to open and check in our certificate library; here's how to read it.
What does “research use only” actually mean?
It means everything here is sold as a reference material for laboratory research — not as a medicine, supplement, or product for people or animals. It's a real legal line, and this guide keeps to it: it explains what each compound is and the science around it, never how to use it on a person.
Single vs kit — what's the difference?
A single is one vial — the smallest quantity you can order. A kit is a multi-vial pack that works out cheaper per vial; the overseas catalog is sold as kits. It's purely a purchasing choice, not a difference in the compound itself.
Why does one compound have so many names?
A compound usually has a plain name (like “Tirzepatide”), a developer's code (like “LY3298176”), and sometimes a nickname. Each card's “Also called” line lists these, so you can match whatever name you've seen elsewhere.
What's a “blend”?
A blend is two or more compounds combined in one vial, studied together — KLOW, for example, combines four. Each card notes when a product is a blend and what's inside it.
US stock vs overseas — which is which?
US-stock items ship from within the country and arrive quickly. The overseas catalog is much larger but takes longer to reach you. Both are held to the same verification standards — more on the trade-offs.
How is it stored?
As a sealed powder, a peptide stays stable for a long time when it's kept cool and out of light. Once it's mixed with liquid, it's kept refrigerated and used within a shorter window. The storage guide covers the details.
What does the purity % (HPLC) mean?
On a COA you'll see a purity percentage, measured by a lab method called HPLC. It tells you how much of the vial is the actual compound versus anything else. Higher is better — reputable batches are usually 98% or above.
How do I pay?
You can pay with crypto — Bitcoin, USDC or Ethereum — billed at the listed total, no premium. Never bought crypto? The checkout FAQ walks you through buying your first Bitcoin with a debit card. The How to Order steps walk you through it even if you've never used crypto before.
Metabolic Research
This group covers compounds that scientists study in metabolic and energy-signaling pathways — including incretin, glucagon, and amylin-axis tools, plus related small molecules used as laboratory probes. Many copy or block natural gut and pancreatic hormones. Everything here is described for laboratory research only, with no human use.
Retatrutide
Incretin-pathway research peptideAlso called: LY3437943, Triple-G, GGG tri-agonist
- What it is
- Retatrutide is a lab-made peptide — a short chain of amino acids, the building blocks of proteins. It is one of the newest molecules in this research area.
- How it works
- It is built to copy three of the body's own hormone signals at once — natural messengers the gut and pancreas send around a meal to modulate glucose-related and energy-handling signals in models.
- Studied in
- Studied in early laboratory and animal research on how switching on several of these natural signals at the same time affects glucose-handling and energy readouts in those models. Research use only.
Note — A newer compound; only a small amount of published research exists so far.
Tirzepatide
Incretin-pathway research peptideAlso called: LY3298176, GIP/GLP-1 dual agonist
- What it is
- Tirzepatide is a man-made peptide (a short chain of amino acids) that copies two of the body's natural gut-hormone signals at the same time. It is widely studied in this research area.
- How it works
- It acts like two of the hormones the gut normally releases after eating — natural signals the body uses to release insulin and in meal-related gut-hormone signaling.
- Studied in
- A commonly referenced compound in laboratory research on glucose-handling and energy-signaling pathways. Research use only.
Semaglutide
Incretin-pathway research peptideAlso called: GLP-1 analog
- What it is
- Semaglutide is a lab-made peptide modeled on a natural hormone the gut releases after eating. It is one of the most-studied molecules in this area.
- How it works
- It copies that natural after-meal gut hormone — one of the signals the body uses in insulin-release and post-meal signaling models.
- Studied in
- A commonly referenced compound in laboratory research on glucose-handling and energy-signaling pathways. Research use only.
Survodutide
Incretin-pathway research peptideAlso called: BI 456906
- What it is
- Survodutide is a man-made peptide (a short chain of amino acids) that copies two of the body's natural hormone signals together. It is an experimental molecule in this research area.
- How it works
- It imitates two of the body's own hormones — signals tied to glucose-handling signals and hepatic energy models.
- Studied in
- Studied in early laboratory and animal research on how those two natural signals affect glucose-handling and energy readouts. Research use only.
Mazdutide
Incretin-pathway research peptideAlso called: IBI362, LY3305677, OXM analog
- What it is
- Mazdutide is a lab-made peptide based on a natural gut hormone called oxyntomodulin. It is an experimental compound in this research area.
- How it works
- It copies two of the body's natural hormone signals — the ones involved in releasing insulin and in how the liver manages energy.
- Studied in
- Studied in early laboratory and animal research on how those natural signals affect glucose-handling and energy readouts. Research use only.
Cagrilintide
Amylin-pathway research peptideAlso called: AM833, long-acting amylin analog
- What it is
- Cagrilintide is a man-made peptide modeled on amylin, a hormone the pancreas releases alongside insulin. It comes from a different hormone family than the peptides above.
- How it works
- It copies the natural amylin hormone — one of the signals the body uses in amylin-axis and glucose-handling models.
- Studied in
- A reference compound in laboratory research on the amylin signal and amylin-axis signaling and energy handling in laboratory models. Research use only.
Cagrilintide + Semaglutide (combo)
Two-peptide metabolism combinationAlso called: CagriSema
- What it is
- This is a pairing of two separate peptides studied together: cagrilintide (based on the hormone amylin) and semaglutide (based on the gut's after-meal hormone). Researchers look at how the two behave side by side.
- How it works
- It brings together two copied hormone signals — one based on amylin, one based on the gut's after-meal hormone — both natural messengers studied in energy-handling research.
- Studied in
- Studied in early laboratory and animal research on how the two signals behave together. Research use only.
AOD-9604
Growth-hormone fragment peptideAlso called: hGH fragment 176-191, Growth-hormone fragment
- What it is
- AOD-9604 is a small peptide copied from just the tail end of human growth hormone. It is only a fragment, not the whole hormone, and it does not carry growth hormone's overall activity.
- How it works
- In lab and animal studies, researchers look at how it relates to the way cells handle fat. Unlike the whole growth hormone, it is reported not to raise a related growth signal (IGF-1). Its exact target inside the cell is not firmly established.
- Studied in
- Studied in early laboratory research on lipid handling in cellular energy models. Research use only.
Note — Older human studies did not reach their goals, and there is still limited information on how it works.
5-Amino-1MQ
Small molecule for adipocyte studiesAlso called: 5-amino-1-methylquinolinium
- What it is
- 5-Amino-1MQ is not a peptide but a small man-made molecule. Researchers use it as a tool to switch off one particular worker — an enzyme — inside cells.
- How it works
- It blocks an enzyme found in adipocytes that helps set how those cells handle energy. Switching that enzyme off is a way for researchers to study the process.
- Studied in
- Studied in early laboratory research on adipocytes and how cells handle energy.
Note — A small molecule with only limited early research. Research use only.
SLU-PP-322
Exercise-signal research molecule- What it is
- SLU-PP-322 is a small man-made molecule used in the lab as an "exercise mimic" — a tool researchers use to explore how exercise-like signals work inside cells.
- How it works
- It switches on a set of cell controls tied to the tiny power plants inside cells (called mitochondria) in muscle and adipose tissue — part of how those cells use cellular fuel.
- Studied in
- Studied in very early laboratory research on cell energy and the tiny power plants inside cells.
Note — A very early-stage, strong-acting compound with limited research. Research use only.
AICAR
Cell-energy research moleculeAlso called: Acadesine, 5-aminoimidazole-4-carboxamide ribonucleotide, AICA riboside
- What it is
- AICAR is a small molecule that imitates one of the cell's "low-energy" signals. It has been a laboratory tool in cell-energy research for a long time.
- How it works
- It flips on the cell's main energy sensor — the switch that decides whether a cell stores fuel or uses it.
- Studied in
- A commonly used compound in laboratory research on cell energy and "exercise-mimic" studies. Research use only.
Adipotide
Experimental adipose-tissue research peptideAlso called: FTPP, Prohibitin-targeting peptide
- What it is
- Adipotide is an experimental peptide designed to home in on the blood-vessel lining that feeds white adipose tissue. Today it is mostly of historical interest in research.
- How it works
- In animal studies it latches onto the blood vessels that supply white adipose tissue and prompts those vessels to die off, using a natural self-clearing process that cells can undergo.
- Studied in
- Studied in earlier animal research on the blood supply to adipose tissue.
Note — Development was stopped after animal studies reported kidney harm; it is of historical research interest only.
L-Carnitine
Naturally occurring nutrientAlso called: Levocarnitine
- What it is
- L-Carnitine is a natural substance the body makes from amino acids. It is also found in food and sold as a dietary nutrient. It is not a designed research peptide.
- How it works
- It works as a shuttle, carrying fatty acids into the cell's tiny power plants (called mitochondria) — a normal step in using fatty acids for cellular energy.
- Studied in
- Referenced in laboratory research on how cells process fatty acids for energy.
Note — A nutrient the body makes from amino acids, not a classic research peptide.
Lipo-C (with Vitamin B12)
Nutrient and vitamin blendAlso called: Lipotropic nutrient blend, MIC-B12, Lipo-Carnitine blend
- What it is
- Lipo-C is a mixed formula that usually combines several lipid-pathway nutrients (often methionine, inositol, choline and/or carnitine) with vitamin B12. It is a nutrient-and-vitamin blend, not a single research peptide.
- How it works
- Its ingredients are natural substances the body uses to move and process lipids, with vitamin B12 acting as a standard helper in the cell's energy steps.
- Studied in
- Referenced in the biochemistry of lipid handling and vitamin cofactors in biochemistry research.
Note — A cosmetic-injection / nutrient blend, not a classic research peptide.
LC120
Cosmetic lipolytic blend (not a research peptide)Also called: Lipolytic cosmetic solution
- What it is
- LC120 is a branded injectable-type formula sold in the cosmetic lipolytic product category. It is a mixed blend rather than one clearly defined research compound, and its exact makeup is not well described in the science.
- How it works
- The commercial "lipolytic" label refers to ordinary cellular lipid breakdown; it is not a defined research-peptide pathway. LC120's exact makeup and how it works are not documented in reviewed science, and no clear cell target has been identified.
- Studied in
- Linked to the cosmetic lipolytic product category; independent scientific study is sparse.
Note — A cosmetic injectable product with limited published information, not a classic research peptide.
Lemon Bottle
Cosmetic lipolytic blend (not a research peptide)Also called: Lipolytic cosmetic solution, Lipolytic ampoule
- What it is
- Lemon Bottle is a branded cosmetic solution sold in the "lipolytic" category. It is commonly reported to contain ingredients such as vitamin B2 (riboflavin), lecithin, and bromelain, an enzyme first found in pineapple. It is a cosmetic blend, not a single research peptide.
- How it works
- The commercial "lipolytic" label refers to ordinary cellular lipid breakdown. Its reported ingredients are vitamins and an enzyme rather than one defined cell-targeting molecule, and solid scientific data on how it works are limited.
- Studied in
- Linked to the cosmetic lipolytic product category rather than a defined research pathway.
Note — A cosmetic injectable product, not a classic research peptide; published study is limited.
Tissue-repair research
This group covers peptides that scientists study in the lab to learn how cells and connective tissue behave in controlled models. In cell samples and animal studies, researchers use them to explore cell movement, new-vessel formation, and inflammation-signaling. All are research compounds for laboratory use only, with no established use in people.
BPC-157
Tissue-repair peptideAlso called: Body Protection Compound-157, PL 14736, Pentadecapeptide BPC 157
- What it is
- BPC-157 is a short lab-made peptide — a small chain of 15 amino acids, the building blocks of proteins. Its recipe comes from a small piece of a protective protein first found in stomach fluid. It is made in the lab and does not occur naturally in this exact form.
- How it works
- In lab and animal studies, researchers describe it as taking part in how the body grows tiny new blood vessels and helps cells travel to where they are needed. These are natural steps the body uses to build and supply new tissue.
- Studied in
- A commonly used reference compound in early tissue-repair and gut research, where scientists watch how cells move and how new blood vessels form in animal and cell-sample studies.
Note — Findings in people are limited; most come from animal and cell research. Research use only.
TB-500 (Thymosin Beta-4 fragment)
Tissue-repair peptideAlso called: TB-500, Thymosin Beta-4 fragment, TB4 fragment
- What it is
- TB-500 is a lab-made peptide built to match a key active part of Thymosin Beta-4, a protein found naturally in many of the body's cells. It copies the section of that protein most studied in the lab.
- How it works
- Researchers describe it as an actin-binding peptide, which means it grabs onto actin — one of the structural proteins cells use to change shape and move. In animal and cell studies, this activity is looked at alongside the forming of new blood vessels and the movement of cells.
- Studied in
- A reference compound in early connective-tissue research models, where scientists study how cells move and how new blood vessels form in lab studies.
Note — Findings are mostly early-stage animal and cell research. Research use only.
BPC-157 + TB-500 (blend)
Two-peptide repair blendAlso called: BPC-157 / TB-500 combination, tissue-model peptide blend
- What it is
- This is a combination product that puts two separate research peptides in one vial: BPC-157 (a lab-made 15-amino-acid peptide based on a stomach-protein recipe) and TB-500 (a lab-made piece matching the active part of Thymosin Beta-4).
- How it works
- Each part is studied for a different process. BPC-157 is looked at for how it relates to the forming of new blood vessels. TB-500 is looked at for how it grabs onto actin, a protein cells use to move. Putting them together lets researchers study both at once.
- Studied in
- Used in early tissue-repair and connective-tissue research, where investigators look at new-blood-vessel forming and cell movement side by side in lab studies.
Note — A mix of two compounds whose findings are mostly early-stage. Research use only.
KPV
Inflammation-research peptideAlso called: Lysine-Proline-Valine, Lys-Pro-Val, alpha-MSH (11-13)
- What it is
- KPV is a very short peptide made of just three amino acids: lysine, proline and valine. This trio is the tail end of a larger natural signaling molecule the body makes, called alpha-MSH.
- How it works
- In lab and animal studies, it is tied to one of the body's natural inflammation-control switches — a signaling system cells use to turn inflammation-related activity up or down. Researchers use KPV as a small tool to study that switch.
- Studied in
- A reference compound in early inflammation and gut-biology research, where scientists study these inflammation-control signals in cell and animal studies.
Note — Findings are mostly early-stage. Research use only.
LL-37
Natural immune-defense peptideAlso called: Cathelicidin LL-37, CAP-18 fragment, hCAP18 (37)
- What it is
- LL-37 is a peptide the human body makes naturally, 37 amino acids long. It is the active part of a germ-fighting protein called cathelicidin, which the body's immune cells produce. The research version is made in the lab.
- How it works
- Researchers describe it as a germ-fighting and immune-signaling peptide: it can break apart the outer coats of microbes and can interact with immune cells that guard the body. Scientists study these germ-fighting and signaling actions in the lab.
- Studied in
- A reference compound in early germ-defense, immune-system and wound-biology research, where investigators study how it acts on microbes and immune cells in lab studies.
Note — A natural immune peptide studied mainly in cell and animal research. Research use only.
ARA-290 (Cibinetide)
Tissue-repair peptideAlso called: Cibinetide, ARA 290, pHBSP, EPO-derived peptide
- What it is
- ARA-290 is a small lab-made peptide of 11 amino acids. Its recipe comes from a piece of erythropoietin (EPO), a natural hormone, but it is designed so it does not act on the part of EPO's biology that makes red blood cells.
- How it works
- Researchers describe it as attaching to a specific repair-related docking point on cells — a spot the body links to mending tissue rather than to making red blood cells. Scientists study this in tissue and nerve-cell samples.
- Studied in
- Looked at in early lab and clinical research on tissue repair and the biology of nerves that run through the body, where scientists study this repair-signaling pathway.
Note — Evidence in people is limited to early-stage clinical research. Research use only.
VIP (Vasoactive Intestinal Peptide)
Natural signaling peptideAlso called: Vasoactive Intestinal Peptide, Vasoactive Intestinal Polypeptide, Aviptadil (synthetic VIP)
- What it is
- VIP is a peptide the body makes naturally, 28 amino acids long. The body uses it as a signaling messenger in the nervous system and the gut. The research form is a lab-made copy of that natural sequence.
- How it works
- Researchers describe it as switching on two docking points found on many kinds of cells, including immune cells. Turning these on sets off one of the cell's common inside-the-cell messenger signals. Scientists study these effects in immune and inflammation studies.
- Studied in
- A reference compound in early immune-system and inflammation-signaling research, where investigators study these cell signals in lab studies.
Note — A natural signaling peptide studied mostly in early-stage models. Research use only.
Growth-hormone & growth-factor (IGF) research
This group of research compounds is studied for how the body's growth-hormone system works. Growth hormone is a natural substance made by a small gland at the base of the brain. Some of these compounds copy the body's own signal that tells that gland to release growth hormone. Others are lab-made copies of growth hormone itself, or of a related messenger the body makes afterward. All are for laboratory research only.
Sermorelin
Growth-hormone-signal peptideAlso called: GRF 1-29, GHRH (1-29), Sermorelin acetate
- What it is
- Sermorelin is a lab-made peptide — a short chain of amino acids, the building blocks of proteins. It copies the front part of the body's own signal that tells a gland at the base of the brain to release growth hormone. It is one of the classic reference versions of that signal in research.
- How it works
- It works like the body's natural signal. It lands on the same spot on that brain gland and prompts it to release growth hormone.
- Studied in
- Studied in laboratory research on the body's growth-hormone system and on how that brain gland is prompted to release growth hormone.
Tesamorelin
Growth-hormone-signal peptideAlso called: TH9507, Tesamorelin acetate
- What it is
- Tesamorelin is a changed version of the body's natural growth-hormone-release signal. A small chemical group has been added to make the molecule sturdier and longer-lasting than the plain copy.
- How it works
- Like the body's own signal, it lands on the matching spot on the gland at the base of the brain and prompts it to release growth hormone.
- Studied in
- Studied in laboratory research on the growth-hormone system and in research on body-composition models and metabolism, which is how the body uses energy.
CJC-1295 with DAC
Long-acting growth-hormone-signal peptideAlso called: CJC-1295 DAC, DAC:GRF, Drug Affinity Complex GRF
- What it is
- This is a changed copy of the body's growth-hormone-release signal, with an added chemical tag. The tag lets it grab onto a common blood protein, which makes it clear from the body much more slowly. That makes it a very long-lasting version studied in the lab.
- How it works
- It lands on the same spot on the gland at the base of the brain that the body's own signal uses to prompt growth-hormone release. The added tag simply keeps it working longer.
- Studied in
- Studied in laboratory research on the growth-hormone system and on how a longer-lasting release signal affects the pattern of growth-hormone output.
CJC-1295 without DAC (Mod GRF 1-29)
Short-acting growth-hormone-signal peptideAlso called: Mod GRF 1-29, Modified GRF 1-29, CJC-1295 no-DAC
- What it is
- This is the same growth-hormone-release signal copy as CJC-1295, but without the tag that makes it grab blood protein, so it is short-lasting. A few small changes to its building blocks make it sturdier than plain sermorelin, though it only stays active briefly.
- How it works
- It lands on the same spot on the gland at the base of the brain that the body's own signal uses to prompt growth-hormone release.
- Studied in
- Used as a reference release-signal copy in laboratory growth-hormone research, often studied alongside the hunger-hormone-type peptides in this group.
Ipamorelin
Growth-hormone-signal peptideAlso called: NNC 26-0161
- What it is
- Ipamorelin is a small lab-made peptide from a family of molecules that prompt growth-hormone release. In research it is often described as one of the more precise-acting members of this family.
- How it works
- It copies the body's hunger hormone (called ghrelin), which, besides signaling hunger, also prompts the brain gland to release growth hormone. Ipamorelin lands on that hunger hormone's docking spot — a different route than sermorelin's signal, but one that also leads to growth-hormone release.
- Studied in
- Studied in laboratory research on the growth-hormone system and on this second, hunger-hormone route to growth-hormone release.
GHRP-2
Growth-hormone-signal peptideAlso called: Growth Hormone Releasing Peptide-2, Pralmorelin, KP-102
- What it is
- GHRP-2 is a small lab-made peptide and one of the earlier, well-studied members of the family of molecules that prompt growth-hormone release.
- How it works
- It copies the body's hunger hormone (ghrelin) and lands on that hormone's docking spot — the same route the natural hunger hormone uses to prompt growth-hormone release.
- Studied in
- Studied in laboratory research on the growth-hormone system and on this hunger-hormone route to growth-hormone release.
GHRP-6
Growth-hormone-signal peptideAlso called: Growth Hormone Releasing Peptide-6, SKF-110679, His-D-Trp-Ala-Trp-D-Phe-Lys-NH2
- What it is
- GHRP-6 is one of the original members of the family of peptides that prompt growth-hormone release, and a common reference compound in this group in research.
- How it works
- It copies the body's hunger hormone (ghrelin) and lands on that hormone's docking spot. In research this same spot is also tied to ghrelin-pathway signaling, which is one reason GHRP-6 is used as a tool to study that circuit.
- Studied in
- Studied in laboratory research on the growth-hormone system and on ghrelin-pathway and meal-related signaling biology.
CJC-1295 + Ipamorelin (combo)
Two-peptide growth-hormone-signal combinationAlso called: CJC/Ipa, GHRH + GHRP combination
- What it is
- This is a combination of two research peptides in one vial. One (CJC-1295) copies the body's growth-hormone-release signal; the other (Ipamorelin) copies the body's hunger hormone. Researchers pair them to study two different routes to growth-hormone release side by side.
- How it works
- CJC-1295 lands on the brain gland's release-signal spot, while Ipamorelin lands on the hunger-hormone spot. The two routes are separate, but both lead to growth-hormone release, which is why the pair is of interest in the lab.
- Studied in
- Studied in laboratory research on the growth-hormone system, looking at how these two release routes behave together.
Note — A combination product; each part is a separate research peptide. Research use only.
HGH (Somatropin)
Lab-made growth hormoneAlso called: Human Growth Hormone, Somatropin, rhGH, GH, 191-aa GH
- What it is
- Somatropin is a lab-made copy of human growth hormone itself — the full natural protein. Unlike the signal-type compounds in this group, which prompt the gland to release growth hormone, this is the growth hormone itself.
- How it works
- It lands on the growth-hormone docking spots on cells throughout the body. This in turn prompts the body to make a follow-on messenger called IGF-1, a growth factor through which much of growth hormone's activity is passed along.
- Studied in
- A central reference hormone in growth-hormone and IGF-1 research.
Note — A powerful protein hormone and the reference standard for this system — research use only.
IGF-1 LR3
Lab-made growth-factor peptideAlso called: Long R3 IGF-1, LR3 IGF-1, IGF-1 Long Arg3
- What it is
- IGF-1 LR3 is an engineered version of IGF-1, the growth factor that growth hormone switches on in the body. It has an extra stretch of building blocks added and one swapped — changes that make it last longer and keep it from being held as tightly by the carrier proteins that normally escort IGF-1 around.
- How it works
- It lands on the IGF-1 docking spot on cells. Because the changes loosen its grip on those carrier proteins, more of it stays free to reach that docking spot in lab-model systems.
- Studied in
- Studied in cell-biology and laboratory research on IGF-1 signaling, cell growth, and cell multiplication.
Note — A powerful growth-factor copy — research use only.
IGF-DES
Lab-made growth-factor peptideAlso called: IGF-1 DES(1-3), DES(1-3) IGF-1, Des-IGF-1
- What it is
- IGF-DES is a shortened form of IGF-1 with its first three building blocks removed. That small edit changes how the molecule interacts with its carrier proteins, and it is studied as a more locally-acting version of IGF-1.
- How it works
- It lands on the IGF-1 docking spot on cells. Removing those first three building blocks sharply loosens its grip on the carrier proteins, so in lab studies it is described as reaching that docking spot more readily right where it is applied.
- Studied in
- Studied in cell-biology and laboratory research on IGF-1 signaling and on growth-factor activity that stays local to one spot.
Note — A powerful growth-factor copy — research use only.
Longevity, mitochondrial & cellular research
Every cell has its own tiny built-in power plants that make the energy it needs to run. Scientists study the compounds in this group in the lab to learn about cell energy and the biology of aging. They are research tools only, with no established use in people.
NAD+
Natural cell helper moleculeAlso called: Nicotinamide adenine dinucleotide, NAD
- What it is
- NAD+ is a tiny helper molecule found naturally in every living cell. It is not a peptide. It works as a partner that lets the cell's tools do their jobs.
- How it works
- It helps carry energy along during the steps that turn food into fuel inside the cell's power plants. The cell also uses it as a raw material for some of its repair and upkeep work.
- Studied in
- Studied in lab and animal models of how cells make energy and how the body ages.
Note — This is a natural helper molecule the body already has, not a lab-made peptide.
MOTS-C
Natural cell-energy peptideAlso called: Mitochondrial ORF of the twelve S rRNA type-c, MOTSc
- What it is
- MOTS-C is a very short natural peptide (a tiny chain of amino acids). It is unusual because its recipe is stored inside the cell's power plants, not in the cell's main control center.
- How it works
- In lab and animal studies it is described as switching on the cell's energy-sensing system, the built-in fuel gauge that tells a cell when to burn energy.
- Studied in
- Studied by researchers looking at how the cell's power plants work and at the biology of aging, often alongside NAD+.
SS-31 (Elamipretide)
Power-plant-targeting peptideAlso called: Elamipretide, MTP-131, Bendavia, Szeto-Schiller peptide 31
- What it is
- SS-31 is a small lab-made peptide of just four amino acids. It is designed to gather inside the cell's tiny power plants, where energy is made.
- How it works
- In the research it is described as attaching to a fat molecule in the inner wall of the power plant. Scientists study how that attachment relates to how smoothly the power plant makes energy.
- Studied in
- A commonly used reference compound in lab research on how the power plants make energy and how cells cope with damage from unstable molecules.
Note — Results from human studies have been mixed, and work on it is still going on. Treat it as a research compound only.
Epithalon
Lab-made short peptideAlso called: Epitalon, Epithalone, AEDG peptide, Ala-Glu-Asp-Gly
- What it is
- Epithalon is a lab-made peptide of four amino acids. Its design is based on a natural substance from the pineal gland, a tiny gland deep in the brain.
- How it works
- In cell and animal studies it is described as affecting an enzyme that maintains the protective caps at the ends of our chromosomes, the strands that carry our genes.
- Studied in
- Studied in lab models of aging biology and of those protective chromosome caps.
Note — The evidence so far comes mostly from early lab studies.
Pinealon
Lab-made short peptideAlso called: Glu-Asp-Arg peptide, EDR peptide
- What it is
- Pinealon is a very short lab-made peptide of three amino acids. It belongs to a family of short peptides first drawn from studies of brain tissue.
- How it works
- In lab models it is described as small enough to slip inside cells and interact with DNA. Scientists study how it relates to gene activity and to how nerve cells cope with damage from unstable molecules.
- Studied in
- Studied in early lab research on protecting nerve cells and on how cells handle stress.
Note — Supporting evidence is limited and comes mostly from early lab studies.
Glutathione
Natural antioxidant moleculeAlso called: GSH, L-glutathione, gamma-glutamylcysteinylglycine
- What it is
- Glutathione is a small molecule made of three amino acids that the body produces on its own. It is one of the most common antioxidants inside our cells.
- How it works
- It mops up unstable molecules that can damage cells, and it teams up with one of the body's own enzymes to help keep the cell's chemistry in balance.
- Studied in
- A reference compound in lab research on cell damage from unstable molecules and on the cell's chemical balance.
Note — This is a natural antioxidant the body makes, not a new lab-designed peptide.
Cerebroprotein
Mixed brain-protein extractAlso called: Cerebrolysin, Cerebroprotein hydrolysate, porcine brain peptide hydrolysate
- What it is
- Cerebroprotein is not a single molecule. It is a mixture of small peptides and loose amino acids made by breaking down purified proteins from pig brain tissue.
- How it works
- In the research it is described as a nerve-supporting preparation. Its mix of peptides is studied for how it interacts with the natural signals that help nerve cells survive and grow.
- Studied in
- Studied in early lab research on protecting and supporting nerve cells.
Note — It is a complex mixture rather than one defined peptide, and study results have been mixed.
Skin, hair & pigment research
This group looks at small peptides — short chains of the building blocks that make up proteins — and copper-carrying peptides that scientists study alongside skin cells, hair-root tissue, and the body's natural color-making cells. Everything here is a reference material for laboratory research only.
GHK-Cu
Copper skin peptideAlso called: Copper tripeptide-1, GHK-copper, Cu-GHK
- What it is
- A tiny natural peptide made of three building blocks (glycine, histidine and lysine) that holds on to a single copper atom. It is found in blood and other body tissues, and the lab form is a blue copper-carrying powder.
- How it works
- Its main job in the body is to carry copper from place to place. In cell and tissue studies, researchers watch how it carries copper and how it relates to the genes behind the mesh of collagen and other proteins that surrounds and supports skin cells.
- Studied in
- Used in the laboratory as a reference tool for studying skin, collagen, wound-repair and hair-root biology. Research use only.
AHK-Cu
Copper hair peptideAlso called: Alanine-histidine-lysine copper, AHK-copper, Cu-AHK
- What it is
- A lab-made peptide of three building blocks (alanine, histidine and lysine) joined to a copper atom. It is a close chemical relative of GHK-Cu.
- How it works
- Like other copper peptides, it works as a carrier for copper. In the lab, researchers look at how it relates to the cells at the base of a hair root and to the growth of tiny new blood vessels.
- Studied in
- A reference tool in laboratory research on hair roots and skin. Research use only.
KLOW blend (GHK-Cu / BPC-157 / TB-500 / KPV)
Four-peptide skin blendAlso called: KLOW, K-L-O-W peptide blend
- What it is
- Four separate research peptides supplied together in one preparation. Each one is its own molecule that scientists also study on its own.
- How it works
- GHK-Cu is a copper-carrying peptide studied in the biology of the protein mesh that supports skin. BPC-157 is a lab-made peptide based on a piece of a stomach-protecting protein, studied in tissue-repair models. TB-500 is a lab-made copy of the active part of a natural protein called thymosin beta-4, studied in how cells move and hold their shape. KPV is a three-building-block tail piece of a natural hormone, studied in models of inflammation signalling.
- Studied in
- Studied together in the laboratory as a combined reference preparation for skin, connective-tissue and cell-signalling research. Research use only.
Note — A blend of four separate research chemicals, not a single molecule.
GHK-Cu + BPC-157 + TB-500 (blend)
Three-peptide skin blend- What it is
- Three separate research peptides supplied together in one preparation, each also studied on its own in the scientific literature.
- How it works
- GHK-Cu is a copper-carrying peptide studied in collagen and skin-support biology. BPC-157 is a lab-made peptide based on a piece of a stomach-protecting protein, studied in tissue-repair models. TB-500 is a lab-made copy of the active part of a natural protein called thymosin beta-4, studied in how cells move.
- Studied in
- Studied together in the laboratory as a combined reference preparation for skin and connective-tissue research. Research use only.
Note — A blend of three separate research chemicals, not a single molecule.
Snap-8
Cosmetic skin peptideAlso called: Acetyl octapeptide-3, Acetyl glutamyl heptapeptide-1, Octapeptide-3
- What it is
- A lab-made chain of eight building blocks with a small chemical cap added, created as a peptide for use on the surface of the skin. It is a longer cousin of a peptide known as Argireline.
- How it works
- Its sequence copies the tail end of a natural protein (called SNAP-25) that helps nerve endings release their signalling chemicals. In lab models, researchers describe it as competing with that natural protein inside the machinery nerve endings use to release those signals.
- Studied in
- A reference tool in research on cosmetic skin peptides and on how nerve endings release their signalling chemicals. Research use only.
Note — Made as an ingredient for use on the skin's surface, rather than a classic injectable research peptide.
Melanotan I
Skin-pigment-signal peptideAlso called: Afamelanotide, MT-1, Melanotan-1, NDP-MSH, [Nle4-D-Phe7]-α-MSH
- What it is
- A lab-made, sturdier copy of a natural hormone (alpha-MSH) that acts as the body's main messenger for making skin pigment.
- How it works
- It copies that natural pigment-signal hormone and switches on the same docking point on the body's pigment-making cells that the natural hormone uses — the signal the body normally uses to make more of the brown pigment in skin.
- Studied in
- A reference tool in laboratory research on skin pigment and the pigment-signalling system. Research use only.
Melanotan II (MT-2)
Skin-pigment-signal peptideAlso called: MT-2, MT-II, Melanotan-2
- What it is
- A lab-made, ring-shaped peptide modelled on the natural pigment hormone alpha-MSH. Unlike Melanotan I, it is not focused on a single target.
- How it works
- It copies the natural pigment-signal hormone, but switches on several related docking points rather than just one, so it acts more broadly across the body's pigment-signalling system.
- Studied in
- A reference tool in laboratory research on skin pigment and the pigment-signalling system. Research use only.
Note — Strong and broadly acting — research use only.
Cognition, mood & sleep research
This group covers molecules that scientists study in the brain, in the body's stress-response system, and in the sleep-wake cycle. Most are short chains of amino acids (the tiny building blocks of proteins), and a couple are signaling substances the body makes on its own. All are described here for laboratory research only.
Semax
Brain-and-memory research peptideAlso called: ACTH(4-10) analog, Met-Glu-His-Phe-Pro-Gly-Pro
- What it is
- Semax is a short lab-made peptide first developed in Russia. It is based on a small piece of a natural hormone the body makes, with a few extra building blocks added so it holds up longer.
- How it works
- In laboratory and animal studies, scientists look at how it relates to a natural protein that helps nerve cells grow and stay healthy. It is also studied for how it touches one of the brain's signaling systems.
- Studied in
- A reference compound in brain research. Scientists study it in laboratory and animal models of learning, memory, and how nerve cells hold up under stress.
Selank
Calm-and-stress research peptideAlso called: Tuftsin analog, TP-7
- What it is
- Selank is a short lab-made peptide, also developed in Russia. It is a modified copy of tuftsin, a small peptide the immune system makes naturally, changed so it lasts longer in the body.
- How it works
- In animal and laboratory studies, researchers look at how it interacts with the brain's main calming system and with the body's own mood- and comfort-signaling chemicals. Its exact workings are still being mapped out.
- Studied in
- A reference compound in research on the body's stress response. Scientists study it in laboratory and animal models of anxiety-related behavior and the brain's chemical balance.
DSIP
Sleep-research peptideAlso called: Delta Sleep-Inducing Peptide
- What it is
- DSIP is a short peptide first found in the 1970s in the blood of sleeping rabbits. It was named after those early experiments, where it showed up alongside the slow brain waves seen during deep sleep in animals.
- How it works
- How it works in the body is not well understood. In the research literature it is linked to sleep- and stress-related brain signaling, but scientists have not pinned down a specific place it acts on.
- Studied in
- A reference compound in sleep and hormone research, studied in animal and laboratory models of the sleep-wake system.
Note — Only limited and inconsistent early research exists, and how it works is still unclear. Research use only.
Melatonin
Naturally occurring sleep hormoneAlso called: N-acetyl-5-methoxytryptamine
- What it is
- Melatonin is a hormone the body makes on its own in the pineal gland, a tiny structure deep in the brain. The body builds it from a building block found in food, and its levels naturally rise at night and fall during the day.
- How it works
- It works through the body's internal 24-hour clock, docking onto matching sites in the brain and elsewhere that help keep that daily rhythm on time.
- Studied in
- A well-known reference molecule in research on the body's daily rhythms, studied in laboratory and animal models of the sleep-wake cycle.
Note — This is a naturally occurring hormone, not a lab-designed research peptide.
Oxytocin
Naturally occurring bonding hormoneAlso called: OT, Oxt
- What it is
- Oxytocin is a small peptide hormone the body makes in the hypothalamus, a control center in the brain, and releases from the pituitary gland. It is one of the body's own signaling molecules.
- How it works
- It works by switching on its own matching docking site, found in the brain and in certain muscle tissue in the body. This is the same site the body's natural oxytocin uses.
- Studied in
- A reference compound in brain and behavior research, studied in animal and laboratory models of social behavior, bonding, and the body's stress response.
Note — A strong signaling hormone — research use only.
Reproductive, Immune & Specialized Research
This group brings together research compounds that work through very different parts of the body. Some send signals in the brain or the reproductive system, one is studied for how it affects the body's defense (immune) system, and a couple are simple nutrients or strong laboratory reference substances. Every item here is described only as a material for laboratory study.
PT-141 (Bremelanotide)
Brain-and-skin signal peptideAlso called: Bremelanotide, PT141
- What it is
- PT-141 is a small lab-made peptide — a short chain of amino acids, the building blocks of proteins. It was developed from an earlier, related compound. It is handled only as a reference material for laboratory work.
- How it works
- It copies one of the body's own signaling molecules, fitting into the docking points that receive that signal on cells in the brain and skin and switching them on the way the natural signal would.
- Studied in
- Studied in early laboratory and animal research on the brain and nervous system and on this signaling system. Research use only.
Note — A strong signaling peptide — research use only.
KissPeptin-10
Reproductive-signal peptideAlso called: Kisspeptin-10, KP-10, Metastin fragment 45-54
- What it is
- KissPeptin-10 is a short piece — ten amino acids long — of a natural signaling peptide called kisspeptin that the brain makes. It is used as a reference compound in the laboratory.
- How it works
- It fits a docking point on certain brain cells. In the body, that docking point helps kick off a chain of hormone signals that runs the reproductive system.
- Studied in
- Studied in laboratory research on reproductive hormones and on how the brain sends these hormone signals. Research use only.
HCG (human chorionic gonadotropin)
Reproductive hormoneAlso called: hCG, Human chorionic gonadotropin, Choriogonadotropin
- What it is
- HCG is a natural hormone — a protein with sugar groups attached to it. In this catalog it is offered only as a reference material for laboratory study, not as a treatment.
- How it works
- It works on the reproductive glands by copying one of the body's own reproductive hormones (called LH), fitting the same docking point on those cells that the natural hormone uses.
- Studied in
- Studied in laboratory research on reproductive hormones and how they send their signals. Research use only.
Note — This is a natural hormone, not a synthetic research peptide — for laboratory use only.
HMG (menotropin)
Reproductive hormone preparationAlso called: Menotropin, Human menopausal gonadotropin, hMG
- What it is
- HMG is a preparation that contains two of the body's own natural reproductive hormones, known as FSH and LH. It is handled as a reference material in the laboratory.
- How it works
- Its two hormones fit the same docking points on the reproductive glands that the body's own FSH and LH use to send their signals.
- Studied in
- Studied in laboratory research on reproductive hormones. Research use only.
Note — This is a hormone preparation, not a synthetic research peptide — for laboratory use only.
Thymosin Alpha-1
Immune-signal peptideAlso called: Tα1, Thymosin α1, TA1
- What it is
- Thymosin Alpha-1 is a peptide, 28 amino acids long, first found in the thymus — a small gland where certain immune cells grow up. It is used as a reference compound for laboratory study.
- How it works
- It interacts with sensing proteins on immune cells that the body uses to detect threats, and it is studied for how it shifts the signals those immune cells send.
- Studied in
- Studied in laboratory research on the immune system and immune-cell signaling. Research use only.
Dermorphin
Opioid-signaling peptideAlso called: Dermorphine
- What it is
- Dermorphin is a peptide, seven amino acids long, first found in the skin of certain South American frogs. It contains an unusual mirror-image building block rarely seen in nature. It is handled strictly as a laboratory reference molecule.
- How it works
- It fits very precisely into one of the body's opioid docking points — part of the natural signaling system the body uses to dampen pain — switching that point on.
- Studied in
- Studied in laboratory research on the body's opioid (pain-signaling) system and on peptide biology. Research use only.
Note — A very strong opioid-signaling peptide — research use only.
Vitamin B12
Naturally occurring vitaminAlso called: Cobalamin, Cyanocobalamin, Methylcobalamin
- What it is
- Vitamin B12 is a natural water-soluble vitamin built around a single cobalt atom. It is a nutrient found in food, not a synthetic research peptide.
- How it works
- It works as a helper molecule for certain enzymes, supporting the everyday chemistry the body uses to build DNA and process nutrients. It works together with folate, another B vitamin.
- Studied in
- Referenced in laboratory research on nutrition biochemistry and metabolism. Research use only.
Note — This is a vitamin, not a classic research peptide — supplied for laboratory use only.
Diluents & further compounds
Reconstitution diluents and additional research compounds.
Bacteriostatic Water 0.9%
Reconstitution diluentAlso called: BAC water, Bacteriostatic Water for Injection
- What it is
- Bacteriostatic water is sterile water with 0.9% benzyl alcohol added as a preservative. In the lab it is the standard fluid used to dissolve (reconstitute) lyophilized peptide powders into a liquid for handling and study. It is a diluent, not a research compound itself.
- How it works
- The benzyl alcohol lets a single vial be drawn from multiple times while limiting microbial growth, which is why it is preferred over plain sterile water for multi-draw reconstitution.
- Studied in
- Used to prepare lyophilized peptide reference materials into solution for laboratory research.
Acetic Acid Water 0.6%
Reconstitution solventAlso called: Acetic acid diluent
- What it is
- A dilute 0.6% acetic acid solution used as a reconstitution solvent for peptides that dissolve poorly in bacteriostatic water. The mild acidity helps bring certain hard-to-dissolve sequences into solution. It is a laboratory diluent, not a research compound.
- How it works
- Lowering the pH improves the solubility of some peptides that resist neutral-pH solvents.
- Studied in
- Used to reconstitute low-solubility peptide reference materials in laboratory research.
PBS (Phosphate Buffered Saline)
Buffer and diluentAlso called: Phosphate-buffered saline
- What it is
- Phosphate-buffered saline is an isotonic, pH 7.4 salt solution used throughout laboratories as a sterile diluent and buffer. It holds samples at a stable, physiological pH and salt concentration. It is a laboratory reagent, not a research compound.
- How it works
- The phosphate buffer resists pH shifts and the saline matches biological osmolarity, making PBS a neutral medium for handling samples.
- Studied in
- Used as a diluent and wash buffer in laboratory research.
CJC-1295 WO/DAC
GHRH analog (GH secretagogue)Also called: Mod GRF 1-29, CJC-1295 no-DAC, Modified GRF (1-29)
- What it is
- CJC-1295 without DAC, often called Modified GRF (1-29), is a lab-made analog of growth-hormone-releasing hormone (GHRH), the natural signal that prompts the pituitary to release growth hormone. 'WO/DAC' means it lacks the Drug Affinity Complex, so it acts over a short window.
- How it works
- It mimics the first 29 amino acids of GHRH and binds the GHRH receptor on the pituitary to stimulate a short pulse of growth-hormone release in research models.
- Studied in
- Studied in laboratory and animal research on growth-hormone secretion, often alongside a ghrelin-receptor peptide such as ipamorelin.
CJC-1295 W/DAC
Long-acting GHRH analogAlso called: CJC-1295 DAC, CJC-1295
- What it is
- CJC-1295 with DAC is a GHRH analog carrying a Drug Affinity Complex (DAC) that binds albumin in the blood, greatly extending how long the molecule stays active compared with the no-DAC version.
- How it works
- Like other GHRH analogs it stimulates the pituitary GHRH receptor; the DAC slows clearance so a single exposure raises growth-hormone signaling over a much longer window in research models.
- Studied in
- Studied in laboratory research on sustained growth-hormone-axis signaling.
CJC-1295 WO/DAC + Ipamorelin
GH-secretagogue research blendAlso called: CJC-1295/Ipamorelin, Mod GRF + Ipamorelin
- What it is
- A research blend pairing two complementary growth-hormone secretagogues: CJC-1295 (no-DAC), a GHRH analog, and ipamorelin, a selective ghrelin-receptor agonist. The two act on different receptors of the same hormonal axis.
- How it works
- CJC-1295 stimulates the GHRH receptor while ipamorelin activates the ghrelin/GHS receptor; together they are studied for how dual-pathway stimulation affects growth-hormone release in research models.
- Studied in
- A commonly referenced combination in laboratory growth-hormone-axis research.
Vasoactive Intestinal Peptide
NeuropeptideAlso called: VIP, Aviptadil (synthetic VIP)
- What it is
- Vasoactive intestinal peptide (VIP) is a 28-amino-acid signaling peptide found naturally in the nervous and digestive systems, where it acts as a neurotransmitter and hormone-like messenger.
- How it works
- VIP binds VPAC receptors and is studied for roles in blood-vessel dilation, immune modulation, and circadian (body-clock) signaling.
- Studied in
- Studied in laboratory and animal research on vascular, immune, and circadian pathways.
Solvents & supplies
These aren't research compounds — they're the sterile liquids and consumables used to reconstitute and handle lyophilized peptides at the bench.
Bacteriostatic water, sterile / PBS, and acetic-acid water
Bacteriostatic water (sterile water with a small amount of benzyl alcohol) and phosphate-buffered saline (PBS) are the standard liquids used to reconstitute freeze-dried peptides for laboratory handling. Dilute acetic-acid water is sometimes used for peptides that dissolve poorly in plain water. They are lab consumables, sold for research handling only. New to mixing? The reconstitution guide walks through the process and the mg-per-mL math.
Beginner questions
What does “research use only” actually mean?
It means every compound on this site is sold strictly as a reference material for laboratory research — not as a drug, supplement, or product for human or animal use. This guide describes what each compound is and the pathways scientists study it in; it is not medical advice and makes no claim that any compound treats, prevents, or benefits any condition.
I'm brand new to this. Where should I start?
Start with the glossary above so the terms make sense, then skim the category that interests you. Each card explains, in plain English, what the compound is, the pathway researchers study it in, and where it sits in the science — no biochemistry degree required.
What's the difference between a single compound and a “blend”?
A single compound is one molecule in the vial. A blend combines two or more compounds in one vial so they can be studied together — KLOW, for example, combines four. Each card notes when a product is a blend and what each part is.
How do I know a compound is really what the label says?
The Certificate of Analysis (COA). For lots we publish, an independent lab ran the assay and the report is yours to open and verify in our certificate library — not a claim that every SKU already has a report on file. Our guide on how to read a peptide COA walks through exactly what to look for.
Does this guide tell me how to use these compounds?
No. This is a research reference. It intentionally contains no dosing, protocols, or usage instructions, because these are laboratory reference materials, not consumer products.
Published third-party COAs, when we hold them
Independent HPLC assays in our open certificate library — open and verify yourself for the lots we have published reports on.
Open the certificate library →More from the research library
How to Read a Peptide COAHPLC purity, mass-spec identity, and the red flags that separate a real test from a fake.
How to Reconstitute Research PeptidesBAC water basics and the mg-per-mL math, in plain English.
GLP-1 Research Compounds ComparedSemaglutide, Tirzepatide, Retatrutide and more, by receptor pharmacology.
For laboratory and research use only. Not for human or animal consumption. This guide is educational information about research compounds and the pathways scientists study — it is not medical advice, dosing guidance, or a claim that any compound treats, prevents, cures, or benefits any condition. Compound descriptions summarize preclinical and laboratory literature and may simplify complex or unsettled science.