ProPep

Understanding Peptides

A plain-language guide to what peptides are and why they are being extensively researched.

The Peptide Library

Peptides are the subject of ongoing research across many areas of health. Start with a topic that interests you, then explore an individual compound to see what the evidence says, and what it doesn't.

Explore the library by name or interest. Every profile separates biological mechanisms, evidence and product-specific regulatory context.

14 of 14 profiles. Topics describe areas of study, not treatment recommendations; evidence filters are navigation aids, not quality scores.

  • Clinical evidence

    Semaglutide

    Wegovy • Ozempic • Rybelsus

    A GLP-1 receptor agonist used in specific prescription medicines for defined indications.

    Weight & metabolism
  • Clinical evidence

    Tirzepatide

    Zepbound • Mounjaro

    A dual-receptor agonist with evidence tied to specific prescription products and patient groups.

    Weight & metabolism
  • Investigational human research

    Retatrutide

    LY3437943

    An investigational compound acting at GIP, GLP-1 and glucagon receptors.

    Weight & metabolism
  • Preclinical / limited evidence

    GHK-Cu

    Copper tripeptide-1 • glycyl-histidyl-lysine copper

    A copper-bound tripeptide studied in skin biology and extracellular-matrix research.

    Skin, hair & aesthetics
  • Preclinical / limited evidence

    AHK-Cu

    Alanyl-histidyl-lysine copper

    A distinct copper tripeptide studied in cultured hair follicles and dermal-papilla cells.

    Skin, hair & aesthetics
  • Preclinical / limited evidence

    BPC-157

    Body protection compound 157

    An experimental compound discussed in tissue-repair research, with major clinical evidence gaps.

    Recovery & tissue research
  • Clinical evidence

    SS-31 / Elamipretide

    Forzinity • elamipretide

    A compound associated with a specific US medicine for Barth syndrome—not general anti-aging approval.

    Cellular science & aging
  • Preclinical / limited evidence

    5-Amino-1MQ

    5-amino-1-methylquinolinium

    A small-molecule NNMT inhibitor included for clarity because it appears in peptide catalogues.

    Weight & metabolism
  • Investigational human research

    CJC-1295

    Verify the exact molecular form

    A growth-hormone-pathway compound whose molecular form matters when interpreting research.

    Muscle & body composition
  • Investigational human research

    Ipamorelin

    Ipamorelin acetate

    An investigational compound discussed in growth-hormone signaling and combination-product marketing.

    Muscle & body composition
  • Preclinical / limited evidence

    TB-500 / Tβ4 fragment

    Commercial naming requires verification

    A research-market name that must be distinguished from full-length thymosin beta-4.

    Recovery & tissue research
  • Clinical evidence

    Tesamorelin

    Egrifta product family

    A prescription compound with a specific visceral-fat indication, not a general weight-loss indication.

    Muscle & body composition
  • Preclinical / limited evidence

    Adamax

    Semax-derived research compound

    A synthetic research peptide described by suppliers as a modified analogue of Semax, investigated for interest in cognition and nerve-cell signalling.

    Cognition, sleep & mood
  • Preclinical / limited evidence

    PT-141

    PT-141 is a research compound supplied for laboratory and scientific study.

    Cellular science & aging
Compound field guide · Weight & metabolism

Tirzepatide

Zepbound • Mounjaro

Clinical evidence

A dual-receptor agonist with evidence tied to specific prescription products and patient groups.

Peptide • GIP / GLP-1 receptor agonist

Product & jurisdiction matter

US: Zepbound and Mounjaro are specific prescription products with their own indications. A compound name alone does not establish product approval.

Trinidad & Tobago product registration and supply authorization have not been verified. US status is reference context only.

How it works

Activates both GIP and GLP-1 receptors, pathways involved in metabolic signaling. A dual mechanism does not by itself determine whether a medicine is suitable for a particular person.

What the evidence shows

Zepbound is FDA-approved for long-term weight reduction in specified adults and moderate-to-severe obstructive sleep apnea in adults with obesity, alongside diet and physical activity. Read the label for eligibility and indication details.

What it does not establish

These findings concern the approved product and studied populations. They do not establish the identity, quality or equivalence of research or compounded alternatives.

Safety & unanswered questions

Gastrointestinal adverse effects are common. The label includes a boxed thyroid C-cell tumor warning and severe gastrointestinal and other safety warnings. It does not recommend combining Zepbound with other tirzepatide products or GLP-1 receptor agonists.

A useful question to ask

What distinguishes an approved formulation from a research product with the same name?

Read the sources

  1. Zepbound prescribing information · current label (opens in a new tab)

Educational information, not a treatment recommendation or instructions for use. Research peptides are sold for laboratory research only.

Keep exploring

Available as a research peptide:AMP-2P

The Basics

You don't need a science degree to ask better questions.

  • What is a peptide?

    A peptide is a chain of amino acids linked by peptide bonds. Different sequences can have very different biological roles, so “peptide” describes a molecular family, not a guarantee of effectiveness or safety.

    Some are naturally occurring signals; others are designed medicines or experimental compounds. Not everything sold as a peptide actually is one: 5-Amino-1MQ, for example, is a small molecule.

  • How do peptides work?

    Some interact with receptors, the proteins that receive biological signals. Others are investigated for interactions with cellular structures or enzymes. The effect depends on the exact molecule, formulation, exposure and biological context.

    A plausible mechanism is the beginning of an explanation. Showing a meaningful benefit requires appropriate studies in people, not just evidence that a pathway changed.

  • What counts as evidence?

    Laboratory studies of cells or tissues help explore mechanisms, and animal studies examine effects in living models. Neither proves a benefit in people.

    For human trials, ask who was studied, whether there was a comparison group, what was measured and for how long. A change in a hormone or biomarker may not mean better health or performance.

  • Does an approved molecule mean an approved vial?

    No. Approval concerns a particular product, formulation and use within a country. A research vial with a matching compound name does not inherit that approval.

    US status is given as reference context. Registration, importation and supply in Trinidad and Tobago are matters for the Chemistry, Food and Drugs Division.

For Education Only

The information on this page is provided for general educational purposes only. It is not medical advice and is not a substitute for a consultation with a qualified physician. Do not start, stop or change any treatment based on this information.

Research peptides sold by ProPeptide are intended strictly for laboratory and research purposes. They are not approved for human or veterinary use, and are not intended to diagnose, treat, cure or prevent any disease.

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