Learn
How peptides work, and how to read the evidence.
What a peptide is, how studies are graded, and how independent COAs fit in.
What is a peptide?
A peptide is a short chain of amino acids, the same building blocks that make up proteins, just fewer of them. Your body already makes thousands of them to signal cells, repair tissue, and regulate metabolism. The research compounds catalogued here are synthetic versions studied for specific effects. Most are not approved for human use and are sold for research only.
The peptide classes we index.
Six research areas in the directory. Open one to see the compounds, the COAs on file, and the studies attached to them.
Healing & recovery
Studied for tendon, ligament, and gut-tissue repair.
BrowseMetabolic & weight
GLP-1 class and related metabolic compounds.
BrowseGrowth hormone
Secretagogues that prompt the body's own GH release.
BrowseCognitive & mood
Studied for focus, memory, and stress.
BrowseLongevity & cellular
Compounds studied for aging and cellular repair.
BrowseSkin, hair & cosmetic
Topical and cosmetic-focused peptides.
BrowseNot all evidence is equal.
Every claim on the site is tagged by where it comes from. From the strongest to the weakest.
- 1
Human trials
Tested in people. The strongest signal, and the rarest for these compounds.
- 2
Animal studies
Most peptide research lives here. Promising, but it does not always translate to humans.
- 3
Lab / mechanistic
Shows how something works in a dish, not whether it works in a body.
- 4
Clinical pearls
What clinicians and experienced users report. Useful context, not proof.
Why we obsess over COAs.
A Certificate of Analysis is an independent lab's measurement of what is actually in a vial: purity, identity, and sometimes contaminants. In a grey market with no FDA oversight, the COA is the closest thing to ground truth. We catalog them so you can check the evidence yourself instead of trusting a label.
Open the COA catalog to see the lab, the lot, and the vendor on file.
Vendor verification, step by step.
How to check if a vendor is legitimate, what COAs contain, how to read them, and how to spot a fake.
Vendor verification
How to check if a peptide vendor is legitimate
Six things to verify before buying: COAs, labs, lot matching, and regulatory status.
Read guideCOA basics
What is a peptide COA test?
What a certificate of analysis contains, what it proves, and what it does not.
Read guideCOA reading
How to read a peptide COA
Field-by-field walkthrough: compound name, lot number, purity, test method, and test date.
Read guideAnti-fraud
How to verify a peptide COA is real
Red flags, Janoshik portal verification, and signs of a fabricated document.
Read guideIndependent labs
Best labs for peptide testing
Janoshik, Benchmark Analytical, RRC: the independent labs behind most peptide COAs.
Read guideLab methodology
What is a bioanalytical testing laboratory?
Assay types, accreditation (ISO 17025, CLIA, GLP), and chain of custody, explained.
Read guideScoring methodology
Peptide vendor trust scores explained
How the Merit Score (0 to 100) is calculated and what it does and does not measure.
Read guideWhat people say
How Reddit vendor ratings work
What the 1 to 10 rating on a shop page means, how to read the colors, and why it is not the Merit Score.
Read guideTesting coverage
Which peptide vendors do third-party testing?
Every vendor with independent COAs on file, sorted by evidence depth, from a single test to hundreds.
Read guideCOA corpus
Peptide COA registry data
Corpus statistics, methodology, and provenance for Merit's index of independent peptide test results.
Read guideBefore you go further.
All compounds on this site are sold for research use only and are not approved for human use. Talk to a clinician who knows your full health picture before making any decision.
Research use only. Not for human consumption and not approved by the FDA.