Every week, people across the UK buy peptides on the strength of a marketing claim. We think they deserve the evidence first.
PeptideClear looks at the evidence behind peptides, products and the businesses selling them, so you can see what stands up and what doesn't.
The UK reference
Showing Testing Transparency — one of three separate measures, not an overall grade
Testing Transparency only, not an overall Trust Index grade · last verified 21 August 2026 · free to every seller, no payment for a better result
What this is
PeptideClear works like Which? Trusted Traders or Checkatrade, but for UK research-peptide sellers. We check the evidence across three separate measures — Testing Transparency, Business Transparency and Responsible Practice — rather than asking other customers what they thought. Every UK seller we can find is checked the same way, for free. Nobody pays to be included, and nobody pays for a better result.
If you sell research peptides in the UK
You don't need to apply. We identify UK sellers and assess what's publicly checkable on your own site. If something we find looks significant, we'll usually try to reach you for context. See how the assessment works →
Testing Transparency — one of three separate measures, not an overall Trust Index grade
36 sellers are tracked but not yet assessed at all. Of the 159 that have been assessed, 151 carry a Testing Transparency grade (shown above); the remaining 8 are flagged for further review and not yet graded — not yet assessed is a fact, not a grade.
Research asset
Every peptide we cover is placed by how far its evidence actually goes, from animal studies to human randomised trials, and grouped by what people use it for.
Grouped by what people use it for
One scale, on every compound. Filled pips show how far the evidence goes: animal work, mixed human data, or human randomised trials.
Become a smarter buyer
The unique key you check at the lab's own portal is the only proof the numbers are real. A PDF can be forged in minutes.
Reused chromatograms, no batch number, a mismatched mass — the tells a vendor will never point out to you.
Why a named, independent lab beats a self-reported figure, and what “research use only” means in UK law.
Independent information and assessment. We don't sell research peptides, dispense medicines or prescribe treatment — we assess UK retailers on observable, published signals across three separate measures, and link out.
We summarise UK peptide categories in plain English. No payment changes an assessment result, and we don't recommend a specific medication or supplement to a specific person. The decision is yours: for prescription medicine the prescriber decides; for research peptides the retailer's “research use only” framing applies.
Before you buy anywhere
Every GLP-1 weight-management medicine licensed in the UK is prescription-only, so a site that sells you one without a prescriber is supplying illegally. Check the seller on the GPhC register, check the prescriber on the GMC register, and treat a price well under the registered-pharmacy range as a warning rather than a find. The MHRA reported seizing more than 5,000 illegally traded GLP-1 products in 2025 alone.
PeptideClear maintains these as refreshable datasets rather than one-off articles. Each carries its own source, methodology and last-updated date.
Monthly NHS England primary-care prescribing volumes for GLP-1 medications, rebuilt as each new month publishes.
Source: NHSBSA English Prescribing Dataset
Registered interventional trials for every research peptide we track, by phase and recruitment status.
Source: ClinicalTrials.gov and ISRCTN
Every MHRA safety alert, enforcement action and drug safety update relevant to weight-loss medicines and peptides.
Source: gov.uk / MHRA
Combines the MHRA feed with a monthly web-search pass for ASA rulings, Trading Standards action and named-retailer enforcement.
Source: gov.uk / MHRA / ASA / Trading Standards
159 UK sellers scored on six observable certificate-of-analysis signals, free and independently.
Source: PeptideClear methodology
Read-only, no-auth REST API and MCP server over the full scored dataset. CC BY 4.0.
Source: PeptideClear, live data