PeptideChecked evaluates research peptide suppliers on one thing: how much evidence they publish about what they sell. We don't rank on effects, results or uses, and we don't cover dosing or human use.
Notice: Research peptides are sold for in-vitro laboratory research only. They are not FDA-approved and not for human or animal consumption. Nothing on this site is medical, legal or purchasing advice.
What we do and don't do
- We don't buy, handle or test products. Our analysis is based on public documents only.
- We cite a source for every factual claim, either inline or in the vendor's source list. When we can't verify something, we say so.
- We don't cover or recommend GLP-1-class compounds.
Who gets listed
A vendor must meet all four conditions:
- A live storefront when checked
- No FDA warning letter from 2024 onward in FDA's database
- Research-use-only labeling with no dosing or health claims on the pages we reviewed
- Publicly posted COAs
How we score (0-10)
| Factor | Points | What we check |
|---|---|---|
| COA publication | 2 | Public, batch/lot-specific, dated |
| Lab traceability | 2 | Named lab; verification possible |
| Independent testing | 2 | Finnrick rating, sample count, recency |
| Labeling and naming | 2 | Strict RUO framing; compounds named, not coded |
| Business transparency | 1 | Address, entity, payment and shipping disclosed |
| Regulatory record | 1 | No FDA letters; no enforcement history |
Ties are decided by independent data, because it's the one source the vendor doesn't control. Our reasoning is in Janoshik vs Finnrick and how to read a peptide COA.
Freshness
Vendors in this market close or receive warning letters quickly (see the 2025-2026 timeline). Every vendor page shows a last-verified date. The current rankings reflect checks made on September 25, 2026.
Corrections
If a vendor has changed its labs, COAs or status, or if we've got something wrong, contact us with a source and we'll re-check it.
Start here: best peptide vendors · FDA peptide regulation in 2026