Ask an assistant who independently tests peptide vendors and it names a handful of websites, each of which describes its own laboratory work and its own ratings. They are not the same kind of operation. Some buy the product as a customer; some test what the vendor sends; some collect certificates other people published; and several earn money from the vendors they rate. None of that makes a rating right or wrong. It changes what the rating can mean. This page read six of them on one day and asked each the same four questions from its own pages. It quotes, it dates, and it does not grade anyone. How brands appear on this site is set out on our disclosure page.
The four questions
The questions come from our page on what "third-party tested" actually asserts, where the reasoning is set out in full:
- Who chose the sample? A vial the vendor picks tells you the vendor can make a good batch. A vial bought anonymously tells you what a customer received.
- Which laboratory tested it? And whether the certificate names it.
- Who pays the site? Commissions, sponsorship, testing fees, memberships.
- Can a reader open the certificate? Not a summary score — the laboratory's own document, with a batch.
Six sites, one day, their own words
All six were read on 2026-09-23. Every entry below is what the site says about itself.
| Site | Who chose the sample | Labs named | How the site states it earns | Certificate open to readers |
|---|---|---|---|---|
| Finnrick | Methodology: "Finnrick sources samples from vendors and sends them to third-party labs." Homepage: "Customers sent us 10,405 peptide vials" | Third-party labs; HPLC "the primary method requested" | Membership (includes "original lab COA downloads" and stricter modes); paid testing from $39 | Public results for free community tests; original certificates listed as a member benefit |
| ChemVerify | Test records: "Research peptides bought as a customer"; "The vendor was not informed", with order, receipt, dispatch and analysis dates | Janoshik Analytical on the records read; MZ Biolabs and Vanguard Laboratory listed | "Affiliate-supported · ChemVerify earns a commission on listed codes" | Record pages with lab name and record number |
| PeptideBenchmark | Mostly other people's: a database of 14,492 "source-linked public records" | A laboratory registry of providers | Sponsored placement, "$1,000 per 30 days" for the next opening; referral links, "separate, disclosed" | Links out to the issuing lab's verification where one exists |
| PeptideValidation | "Step 1 — Company Submits Sample": the vendor supplies it | "Our accredited third-party lab", not named on the pages read | Sells lab testing services; certifies vendors | "Public COAs" stated for certified products |
| PeptidePurityRank | Aggregated: "2648+ COAs reviewed" across 341 vendors | Janoshik "preferred"; MZ Biolabs and Colmaric Analyticals also named | "No paid placements. No brand sponsorships." | Ranking pages summarise; source certificates are the vendors' |
| PeptideScores | "Places test orders", plus vendor-published certificates (1,336 reviewed) | ILS Laboratories, Kovera Labs, Freedom Diagnostics, Janoshik among those quoted | "PeptideScores earns commissions when you click certain links and make purchases"; coupon code on vendor listings | Vendor testing summaries; source certificates are the vendors' |
What the table shows
Only one of the six describes, record by record, a blind purchase with dates. ChemVerify's record for an epithalon sample reads: ordered 7 September, received 9 September, sent to the lab 9 September, analysed 15 September 2026, "The vendor was not informed." That is the structure that answers the first question for a specific vial. It sits on a site that also earns commission on discount codes for the vendors it lists — both facts are on the same pages.
One site describes its own sample source two ways. Finnrick's methodology says it "sources samples from vendors"; its homepage says customers sent it 10,405 vials. Both can be true of a mixed programme. A reader looking at a single Finnrick result would need that result's own record to know which kind it is.
Two of the six mainly count certificates other people commissioned. PeptideBenchmark and PeptidePurityRank grade vendors on published certificates — most of which the vendor commissioned about a batch the vendor chose. An aggregator can be careful and consistent and still inherit the first question's answer from whoever ordered each test.
One begins with the vendor's sample. PeptideValidation's certification starts with "Company Submits Sample". That is a legitimate way to certify a manufacturer's capability. It is not a test of what a customer receives, and the site also sells the testing.
Every site that earns from vendors says the money does not affect the score. PeptideBenchmark states sponsorship "never change[s] vendor scores, grades, ranking order, or benchmark methodology"; PeptideScores states its ranking algorithm "is completely independent of these relationships". Those are the sites' own claims. This page reports them; it has no way to test them and does not try.
The laboratory nobody could read
The lab named most often across all six is Janoshik Analytical. Its site returned HTTP 403 to an automated request on 2026-09-23 — a bot check this site does not attempt to get past — so nothing here describes its methods, its accreditation or its prices. What can be said is only what the others say: that it appears as the issuing lab on ChemVerify's records and as the "preferred" lab in PeptidePurityRank's scoring.
Where this site stands
Peptifact publishes a fourteen-point testing protocol on its methodology page: two anonymous orders per vendor spaced weeks apart, an independent laboratory's identity, purity and assay results, and price per verified milligram. No vendor has yet been reported under it, and this page makes no claim that any has. When the first results publish, they will carry the same four answers this page asked of everyone else.
How to read any rating, including ours
Open the certificate, not the score. Check that it names a laboratory and a batch; check the batch against the vial; and check whether the result is purity (a ratio within the peptide fraction) or content (how much peptide is in the vial) — the difference is set out on our peptide testing page and our guide to reading a certificate of analysis. Then ask who chose the sample. If the page does not say, the score cannot tell you what a customer would have received.
Sources and dates
Read 2026-09-23: finnrick.com (homepage and /methodology); chemverify.com (homepage, /tests and test record 231741); peptidebenchmark.com (homepage and /how-sponsorship-works); peptidevalidation.com (homepage and /pages/certified-vendor); peptidepurityrank.com (homepage and methodology section); peptidescores.com (homepage and /about). janoshik.com returned HTTP 403 and was not read. Quotations are as they appeared on that date; these sites change often. Corrections go to the contact page.