Peptio

What the research actually says about peptides

Every claim on this site is labelled with the kind of study behind it and linked to its source. Where the evidence runs out, we say so.

Browse the peptide libraryHow we read research

Evidence availablen=4
Human evidence
3
Animal or in-vitro
1
Mechanism only
0
4
Peptides catalogued

Each one an entity page, not an article

3
With human evidence

of 4 catalogued

75
Sources catalogued

32 conducted in humans

3
Evidence reviews

Across 8 research areas

Start here

Four ways into the research

The library holds the structured evidence, the areas group it by goal, the articles work through it, and the methodology explains how any of it was judged.

  • 01ExploreCompare

    Peptides

    Structured profiles: evidence by tier, registry identifiers, risks and regulatory status per jurisdiction.

    Browse the library
  • 02RecoveryLongevity

    Topics

    Eight research areas: recovery, performance, sleep, longevity, cognition, weight, skin and safety.

    Explore topics
  • 03ReviewsComparisons

    Articles

    Evidence reviews and comparisons, each built from the primary literature and citing every source.

    Read articles
  • 04SourcesLimits

    Methodology

    How sources are chosen, what each evidence label means, and the claims this site refuses to make.

    Our process

Our approach

How to read an evidence label

Every claim carries the kind of study behind it and a link to that study. Eight tiers collapse into three bands, so you know what a claim rests on before you read it.

Read the full methodology

  • Human randomised trial

    Measured in people under controlled conditions. The only kind of evidence that can show a substance works in humans.

    Strongest

    ExamplesRandomised trials, meta-analyses

  • Animal or in-vitro

    Measured in animals, cells or tissue. Often where a promising idea starts, and frequently where it stops.

    Indirect

    ExamplesRodent models, cell studies

  • Mechanism or anecdote

    A plausible biological story, or someone’s report. Neither is a measured outcome.

    Weakest

    ExamplesProposed mechanisms, self-reports

In the library

Structured evidence, registry identifiers and regulatory status per jurisdiction, for each compound.

All 4 peptides

  • BPC-157

    BPC 157, PL-14736, PL 14736, PLD-116, PL-10, Bepecin, pentadecapeptide BPC 157

    A 15-amino-acid fragment of a gastric juice protein, studied mostly in rats for tendon and muscle healing. No randomised trial has shown a benefit in people.

    Case reportIn clinical trialsrecovery / performance

  • Retatrutide

    LY3437943, LY-3437943

    Retatrutide is an investigational triple receptor agonist with published phase 3 trials. It is not approved by FDA or EMA, the two regulators checked.

    Human RCTIn clinical trialsweight management

  • TB-500

    TB500, TB 500, Ac-LKKTETQ, TB-500 acetate, thymosin beta-4 fragment 17-23

    A seven-amino-acid fragment of thymosin beta-4, not the protein itself. No study has reported giving it to a human being.

    AnimalNo published human datarecovery / performance

  • Tirzepatide

    LY3298176, Mounjaro, Zepbound

    Tirzepatide is a dual GIP and GLP-1 receptor agonist, approved in the US and the EU for type 2 diabetes and for weight management.

    Human RCTApproved for a medical indicationweight management

Explore by goal

Research areas

Eight areas, each one a hub linking the peptides studied for it and the evidence reviews written about it.

View all research areas

  • Recovery

    Tendon, muscle and connective tissue repair, and what was measured in people.

    2 peptides

  • Performance

    Athletic output, body composition, and anti-doping status under WADA.

    2 peptides

  • Sleep

    Sleep architecture and quality, separating laboratory findings from self-report.

  • Longevity

    Ageing research, where outcomes take a lifetime and surrogate markers stand in.

  • Cognition

    Memory, focus and neuroprotection, and how far the research gets to real endpoints.

  • Weight Management

    The one area with large randomised trials and approved medicines, next to ones without.

    2 peptides

  • Skin & Hair

    Topical cosmetic research kept separate from systemic claims.

  • Safety & Regulation

    Adverse effects, product quality, and legal status across the major jurisdictions.

Latest writing

All articles