Is MrPep legit? An independent review
MrPep checked 27 September 2026: mrpep.co.uk is a live UK WordPress/WooCommerce storefront (GBP pricing, WhatsApp contact) selling research peptides including retatrutide, tirzepatide, BPC-157, TB-500, CJC-1295 no-DAC with ipamorelin, GHK-Cu, NAD+, SS-31 (elamipretide), DSIP, PT-141, pinealon, selank, semax, eloralintide, glutathione, AOD-9604 and a KLOW blend. Its /verify/ page publishes full signed PDF certificates naming three US laboratories (Freedom Diagnostics, SteriGenix, Horizon Analytical) with lot and report numbers; none of these can be checked against an independent lab verification portal, only the PDF itself. The site's testing page states two of its certificates come from Janoshik, a European lab, and can be checked directly on the lab's own verification page; one such genuine keyed link was found on the retatrutide product page (task 81504, https://verify.janoshik.com/tests/81504-JKL_RT20_LNS2VPY19TXL), unread this session as no browser session was available; the second Janoshik-sourced certificate referenced in copy was not located on any product page checked. No company name, registration number or registered office is stated anywhere on the site. Companies House free-text search for 'MrPep' returns two active companies at the same Thornton Heath address, MR. PEPS LTD (16864926, incorporated 19 November 2025) and MR. PEPS LABS LTD (17234136, incorporated 21 May 2026), neither confirmed as this site's operator from anything stated on the site itself, so recorded as an open question, not a match. What would move this listing: reading the retatrutide task through Janoshik's own site (an own-name client moves it toward verified tier, a mismatched or Anonymous client keeps it at watch), or a confirmed company match.
Which UK sellers do pass this check?
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 | nothing we could verify in this seller's own name, details below | read on the seller's own site |
| This audit as data | /data/vendor/mrpep-co-uk.json | same record the open dataset serves, re-checked daily |
- A certificate that verifies in this seller's own name on an independent laboratory's website
- Any certificate from a named independent laboratory on the pages we audited
Pricing vs the market, benchmarked on BPC-157
The Peptide Watch benchmarks every vendor on the same compound, BPC-157, the most common research peptide, as £ per milligram, so prices are directly comparable across all providers. No public BPC-157 price feed was available for this vendor at audit.
Is MrPep legit? The questions people ask
Is MrPep legit?
MrPep (mrpep.co.uk) is on The Peptide Watch's watch list. It does not publish a certificate of analysis that can be independently verified in its own name, so its quality claims rest on trust rather than checkable evidence. That is not proof of a scam; it means the evidence does not check out.
Can I trust MrPep, and is it a good supplier?
You cannot independently verify its testing today. A good delivery reputation is not the same as a verifiable certificate; the two are unrelated. Until MrPep publishes an own-name certificate you can check on an independent lab's website, you are taking its quality on trust.
Is MrPep a scam?
The Peptide Watch does not assert that. What is observable is the reason it sits on the watch list: real lab, but not janoshik. Being unverifiable is a reason for caution, not proof of fraud.
Does MrPep publish a real, verifiable Certificate of Analysis?
Not one that can be independently verified in its own name. ⚠️ Real lab-issued PDFs, mostly not Janoshik. MrPep (mrpep.co.uk) publishes full signed certificates from three named US laboratories for most of its research-peptide catalogue, plus one genuine Janoshik verify link on its retatrutide page that this audit has not yet read.
Which UK peptide sellers do publish a verifiable certificate of analysis?
Of the 414 active UK sellers The Peptide Watch audits, 35 publish a certificate of analysis you can verify in their own name on the independent laboratory's own website. Ranked by most recent certificate, they are Lab77Peptides, Peptology Labs, Biohackpeptides, Zenic Labs, Pureline Biolabs and 30 others. This is a record of who publishes verifiable paperwork, not a recommendation.
Related vendors
Compare with independently-tested vendors: Is Lab77Peptides legit? · Is Peptology Labs legit? · Is Biohackpeptides legit?
The Peptide Watch. "Is MrPep legit? Independent review & COA audit." Verified 27 September 2026. https://thepeptidewatch.com/vendor/mrpep-co-uk