Is Simplypeptides legit? An independent review
Simplypeptides publishes its own Janoshik certificate of analysis, naming Simplypeptides as the client, with its most recent certificate dated May 2026. Because Janoshik reports carry a unique code checkable on janoshik.com, the result can be independently verified.
Verified facts at a glance
| Fact | What we found | How it was checked |
|---|---|---|
| Standard applied | own-name verifiable-COA standard | how every vendor is judged, methodology |
| Certificate | ✅ genuine Janoshik, own name | read on the seller's own site |
| Latest certificate date | May 2026 | as printed on the report |
| Domain registered | Nov 2025 · 10 months old | the domain registry's public record |
| This audit as data | /data/vendor/simplypeptides-co-uk.json | same record the open dataset serves, re-checked daily |
The certificate
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 |
Show buyers you are independently verified
Simplypeptides is one of only 38 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.
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Reviews
Read it critically. A Trustpilot score measures whether parcels turn up and support replies, not whether the vial contains what the label says. A vendor can have hundreds of happy delivery reviews and still show you a borrowed or fake certificate; the two are unrelated. Also watch for a burst of near-identical 5-star reviews in a short window, the signature of bought reviews.
Read Simplypeptides on Trustpilot →
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.
Payment
Is Simplypeptides legit? The questions people ask
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.
Can I trust Simplypeptides, and is it a good supplier?
Its lab evidence is independently verifiable, which is the best signal a paper trail can give. Its Trustpilot score is 4.7 from 60 reviews, which reflects delivery and service, not whether a vial contains what the label says. Even a genuine certificate proves a sample was tested once, not that your specific batch matches it, so weigh it alongside consistent results over time.
Is Simplypeptides a scam?
Nothing in this audit indicates that. Simplypeptides shows a verifiable own-name Janoshik certificate, the opposite of the borrowed or self-made certificates the watch list flags. Judge it on that checkable evidence rather than the word 'scam'.
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.
Related vendors
The Peptide Watch. "Is Simplypeptides legit? Independent review & COA audit." Verified 30 September 2026. https://thepeptidewatch.com/vendor/simplypeptides-co-uk