PS Research Labs (trading as PS Labs) is a UK-registered supplier with a small catalog of common research compounds priced in GBP. Since this review was first published, PS Labs has added a "Supplier certificate of analysis" link to individual product pages: every product checked for this update (BPC-157, Tirzepatide, Retatrutide, and AHK-Cu) now links out to a Certificate of Analysis, most pointing to an independent Janoshik verification page rather than only a supplier-hosted file. Combined with the company's real UK registration, this is a meaningful improvement over the storefront's earlier documentation posture.
This page is reviewed periodically so the notes stay current on catalog size, documentation language, and company registration status. This update reflects newly published per-product Certificates of Analysis found on the site.
The goal is to weigh the two genuine trust signals here — a real, checkable UK company registration and now a per-product Certificate of Analysis link — against the remaining gaps, so a reader can decide with an accurate, current picture.
PS Research Labs Ltd lists a Companies House-style registration number (17327405) and a registered office address in Kington, Herefordshire, in its Terms of Service — details a reader can independently check. Product pages now also include a "Supplier certificate of analysis" link; every product checked for this update linked out to a real COA, mostly hosted on the independent Janoshik verification platform.
UK-based researchers who want a straightforward small catalog, value a registered company name and number on file, and now also get a per-product COA link to check before ordering.
The registered company details remain the clearest baseline positive — a real UK Ltd entity with a checkable registration number — and product pages now back that up with an actual, clickable Certificate of Analysis link rather than only a promise of documentation.
Every product checked for this update (BPC-157, Tirzepatide, Retatrutide, AHK-Cu) now shows a "Supplier certificate of analysis" link at the bottom of the page. Three of the four linked to an independent Janoshik verification page; one (Retatrutide) linked to a self-hosted PDF on the store's own CDN rather than an independent lab site.
The specifications accordion on each product page still reads "Documentation: Batch documentation available where applicable," which is stale copy now that a COA is actually linked below it. Confirm the linked COA's batch/lot number matches what ships with your order, and note that not every COA is independently hosted.
Researchers who want a verifiable UK business registration and are now also able to check a per-product COA before ordering, rather than requesting it directly.
The catalog covers a handful of common compounds — Retatrutide, Tirzepatide, BPC-157, TB-500, GHK-Cu, and MOTS-C were visible at the time of this review — each with a "Specifications" accordion listing strength, form, storage guidance, and a "Supplier certificate of analysis" link near the bottom of the page.
There's no standalone COA library page, but every product page checked for this update (BPC-157, Tirzepatide, Retatrutide, AHK-Cu) carried a "Supplier certificate of analysis" link. Most pointed to verify.janoshik.com, an independent testing verification platform; Retatrutide's linked to a self-hosted PDF instead.
PS Research Labs Ltd's Terms of Service list a registered office at 61a Bridge Street, Kington, HR5 3DJ, United Kingdom. A registered office is a legal requirement for a UK Ltd company and can be a mail-forwarding address rather than a working warehouse, so it confirms the company's legal existence without confirming operational scale.
The homepage shows a badge for a listing on Peptide Supermarket, a third-party aggregator. That's a mild external signal worth noting but isn't a substitute for published testing documentation.
PS Research Labs has a genuine, checkable UK company registration and, as of this update, a real per-product Certificate of Analysis link on every page checked, mostly through independent Janoshik verification. That's a meaningful improvement over this review's original findings, though the leftover "batch documentation available where applicable" copy and the one self-hosted PDF are worth a closer look before ordering.
A stronger pick than before: worth considering for UK-based researchers who want a verifiable business registration plus a checkable COA, though it's still worth confirming the batch/lot number on the linked COA matches what actually ships.