Is MrPep legit? An independent review
MrPep is on the watch list: its certificate can't be verified in its own name, one of 483 of 524 UK sellers that fail this check.
- Certificate
- none found in its own name
- Official website
- mrpep.co.uk
- 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
What we found
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.
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.
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Questions people ask about MrPep
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.
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.
How do I check MrPep's certificate myself?
Find the certificate on mrpep.co.uk and read four things: an independent laboratory is named; the client field names MrPep, 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.