All Peptides Names: A Complete List and What They Do

Peptides are short chains of amino acids, and the peptide names people search for most often fall into a handful of clear groups: metabolic drugs such as semaglutide and tirzepatide, research compounds such as BPC-157 and TB-500, cosmetic ingredients such as Matrixyl and GHK-Cu, antimicrobial peptides such as LL-37, and the peptides your own body makes, including insulin and oxytocin. This guide lists the names you are most likely to run into and explains what each group is studied for. Nothing here is medical advice, and most peptides sold online are not approved for human use.

What Is a Peptide, Exactly?

A peptide is a chain of roughly 2 to 50 amino acids joined by peptide bonds. Longer chains are usually called proteins, though the boundary is fuzzy — insulin, a 51-amino-acid hormone, is still commonly described as a peptide.

Many peptide names describe their own structure. "Penta" means five amino acids, "hexa" means six, and a number in a cosmetic name such as palmitoyl tripeptide-1 usually points to chain length.

• Dipeptides: two amino acids, such as carnosine and aspartame
• Tripeptides: three amino acids, such as glutathione
• Oligopeptides: roughly 4 to 20 amino acids, which covers most cosmetic peptides
• Polypeptides: roughly 20 to 50 amino acids, which includes insulin

Peptide Names by Category

Grouping names by category is faster than memorizing an alphabetical list, because the category tells you what the compound is actually used for.

Category	Example peptide names	Typical use	US status
Metabolic / GLP-1	semaglutide, tirzepatide, liraglutide, retatrutide	Blood sugar control and weight management	Prescription; retatrutide is investigational
Research and repair	BPC-157, TB-500, GHK-Cu, thymosin alpha-1	Studied in laboratory and animal models	Not FDA-approved for human use
Growth hormone secretagogues	ipamorelin, CJC-1295, sermorelin, tesamorelin	Studied for growth hormone release	Mostly research; tesamorelin is FDA-approved
Cosmetic	Matrixyl, argireline, copper tripeptide-1	Skincare creams and serums	Used as cosmetic ingredients
Antimicrobial	LL-37, defensins, nisin	Immune defense and food preservation	Nisin is FDA-approved as a food preservative

A table of all peptides and their functions is far more useful than one flat list, because it separates prescription medicines from research chemicals from skincare ingredients.

Metabolic and Weight-Related Peptide Names

These are the peptide names most Americans encounter through a pharmacy rather than a research catalog.

• Semaglutide — sold as Ozempic, Wegovy, and Rybelsus for type 2 diabetes and chronic weight management
• Tirzepatide — sold as Mounjaro and Zepbound
• Liraglutide — sold as Victoza and Saxenda
• Retatrutide and cagrilintide — investigational compounds still in clinical trials
• Insulin and pramlintide — older metabolic peptides still prescribed today

Anyone comparing all peptides for fat loss should know that only a small number are FDA-approved for weight management, and every one of them requires a prescription and medical supervision.

Research and Repair Peptide Names

This is the category that generates the most internet hype and the most confusion.

• BPC-157 — a synthetic fragment studied largely in animal models
• TB-500 — a fragment of thymosin beta-4, also studied in animals
• GHK-Cu — a copper-binding tripeptide used in skincare research
• Thymosin alpha-1 — studied for immune modulation
• LL-37 — a naturally occurring antimicrobial peptide

BPC-157 and TB-500 are not FDA-approved for human use in the United States, and they are typically sold with a "for research use only" label.

Growth Hormone Secretagogues

These peptides are studied for their ability to stimulate natural growth hormone release rather than deliver the hormone directly.

• Ipamorelin, hexarelin, GHRP-2, and GHRP-6 — research peptides
• CJC-1295 and sermorelin — studied for pituitary signaling
• Tesamorelin — FDA-approved as Egrifta for a specific fat-distribution condition in people with HIV

MK-677 is frequently listed alongside these names, but it is an oral secretagogue, not a peptide.

Cosmetic and Skincare Peptide Names

Cosmetic peptides appear on ingredient labels far more often than in clinical settings.

• Matrixyl — palmitoyl pentapeptide-4
• Argireline — acetyl hexapeptide-8
• Copper tripeptide-1 — GHK-Cu in topical form
• Palmitoyl tripeptide-1 and palmitoyl tetrapeptide-7 — common in anti-aging blends
• Hydrolyzed collagen peptides — sold as powders and drinks

Shoppers often ask are all collagen peptides the same, and the honest answer is no — molecular weight, amino acid profile, and source all affect how a product behaves.

Peptides Your Body Already Makes

Not every peptide is a lab product. Some of the best-known names are endogenous hormones and signaling molecules.

• Insulin and glucagon, which regulate blood sugar
• GLP-1, which slows digestion and signals fullness
• Oxytocin and vasopressin, which act on the brain and kidneys
• Calcitonin, ACTH, somatostatin, and angiotensin II
• Endorphins, which are short opioid peptides

Are All Peptides Synthetic? Are All Peptides Injectable?

No on both counts. The question are all peptides synthetic has a simple answer: plenty of peptides are manufactured in a lab, but many occur naturally in the human body, and others are derived from food or fermentation.

People searching are all peptides injectable are usually wondering whether every peptide requires a needle. It does not. Common delivery routes include:

• Injection: insulin, semaglutide, tesamorelin
• Oral or sublingual: semaglutide tablets, collagen supplements
• Topical: cosmetic peptides in creams and serums
• Nasal: desmopressin and some research peptides

Safety, Regulation, and Legal Status

The legal picture depends entirely on which peptide you mean. FDA-approved peptides are prescription medicines, while research peptides are not reviewed for safety, sterility, or purity.

Research peptides labeled "for research use only" have not been evaluated by the FDA for human safety or effectiveness.

Risks reported with unregulated peptide use include contaminated vials, inaccurate dosing, allergic reactions, and interactions with prescription medications. Anyone considering a peptide should talk with a licensed healthcare professional first, especially if they take insulin, blood thinners, or hormone therapy.

How to Read a Peptide List Without Getting Misled

Most peptide lists online are written by vendors, so a few habits help you separate facts from marketing.

1. Check whether the peptide is FDA-approved, investigational, or research-only.
2. Look for a stated mechanism and the species studied — mouse data is not human data.
3. Ignore dosing suggestions from sellers, which are not medical guidance.
4. Treat forum threads as anecdotes, not evidence.

Used carefully, a category-based list of peptide names is a solid starting point for a conversation with a clinician rather than a shopping list.

COMMON QUESTIONS

Frequently Asked Questions

Is there a complete list of all peptides names?

There is no single official list, because thousands of peptides have been identified and new synthetic versions are created regularly. Practical lists group names by category instead: metabolic peptides like semaglutide, research peptides like BPC-157, cosmetic peptides like Matrixyl, and natural hormones like insulin and oxytocin.

Which peptide names are FDA-approved for weight loss?

Semaglutide (Wegovy), tirzepatide (Zepbound), and liraglutide (Saxenda) are FDA-approved for chronic weight management and require a prescription. Retatrutide and cagrilintide are still investigational. Peptides sold online as research chemicals are not approved for weight loss or any human use.

Are peptides legal to buy in the United States?

FDA-approved peptides are legal only by prescription. Research peptides are often sold legally with a "for research use only" label, but that label means they have not been reviewed for human safety, purity, or dosing, and selling them for human consumption is not permitted.