Is Simplypeptides legit? An independent review
Simplypeptides is independently tested: its certificate is genuinely its own and verifiable, one of only 41 of 519 UK vendors that pass.
- Certificate
- Janoshik, in the seller's own name · 1 report read · newest analysed 27 May 2026 · see the reports
- Official website
- simplypeptides.co.uk
- Payment
- Bank only
- Reviews
- Trustpilot 4.7 from 60 reviews · on Trustpilot
- Buyer reports
- Coming soon, visible from 1 November 2026 · tell us about your order
Checked daily against the seller's site, the laboratory's site and the public record. If this seller publishes new evidence, tell us and it is re-checked. Method · data · correction
New As of 13 October 2026 you can leave feedback on your order. Reports are being collected now and will be shown on this page from 1 November 2026, so every seller has the same time to gather them. Written notes appear only after we have read them.
Tap one to start, about 30 seconds.
1 reports we opened on Janoshik's site
Each row was opened by a real page load on verify.janoshik.com and transcribed. The client column is the name the laboratory printed. Newest first. Audit findings, not recommendations.
| Task | Sample | Test | Client on the report | Received | Result | |
|---|---|---|---|---|---|---|
| #165845 | Retatrutide 10mg | purity | Research Stack - Simply Peptides | 22 May 2026 | Retatrutide · 9.63 mg · 99.779% | verify |
How we read the certificate
Simplypeptides reviews: what others report
Third-party signals we found, reviews, independent tests and platform actions, each attributed to its source and labelled by how well it is corroborated. This is not our own verification; items marked "single / unverified report" are unconfirmed and should be treated with caution.
Questions people ask about Simplypeptides
Is Simplypeptides legit?
On The Peptide Watch's independent audit, Simplypeptides (simplypeptides.co.uk) publishes its own verifiable Janoshik certificate of analysis that names Simplypeptides itself as the client, so its testing can be checked on Janoshik's own website. That is the strongest evidence standard we track. It confirms the credibility of the seller's evidence, not any individual vial you receive.
Does Simplypeptides publish a real Certificate of Analysis?
Yes. Its most recent own-name Janoshik certificate is dated May 2026 and can be verified on Janoshik's website by its unique code, so the purity result cannot be faked or edited.
How do I check Simplypeptides's certificate myself?
Find the certificate on simplypeptides.co.uk and read four things: an independent laboratory is named; the client field names Simplypeptides, not a supplier; the compound line names the peptide you are buying, not only a batch code; and the report opens on the laboratory's own website from its task number and key (verify.janoshik.com for Janoshik). Then compare the batch number on the report with the one on your vial. The free COA Checker on this site runs the first three checks on a photo of the certificate.
Show buyers you are independently verified
Simplypeptides is one of only 41 UK vendors whose testing The Peptide Watch could independently verify. If that is you, display this badge: it links back to this audit. No fee and no catch, verified vendors are welcome to use it. It keeps itself up to date: it shows as verified only while this listing is verified.
<a href="https://thepeptidewatch.com/vendor/simplypeptides-co-uk" target="_blank" rel="noopener"><img src="https://thepeptidewatch.com/badge/simplypeptides-co-uk.svg" alt="Verified by The Peptide Watch" width="272" height="48" style="border:0"></a>