How we rank
PeptideCheck exists to answer one question honestly: where is this peptide cheapest in the UK right now, delivered? This page explains exactly how every number on the site is produced, so you can check our working.
1. Prices come straight from vendors’ systems
Vendors marked Live data run our free PeptideCheck Connect plugin. It sends their published price, stock status and delivery terms to us automatically, twice a day and within five minutes of any change. Every message is cryptographically signed, so a price cannot be faked or tampered with in transit. Prices include VAT.
2. We rank by cost per milligram, delivery included
A cheap vial with expensive postage is not cheap. For every listing we calculate (price + delivery) ÷ milligrams, using the vendor’s cheapest tracked UK delivery and honouring their free-delivery threshold. HGH is compared per IU. Where a vendor has published a discount code for PeptideCheck visitors we also show the code-adjusted figure, and that is what we sort by.
3. Nobody can pay to rank higher
Every vendor pays the same flat commission on sales we refer. There is no premium tier, no featured placement inside the comparison table and no way to buy a better position. If we ever run a sponsored slot it sits outside the ranked table and is labelled Sponsored in plain words.
4. Trust scores are computed, not negotiated
Each vendor’s trust score (0 to 100) is calculated from public, checkable facts: whether their prices are live-fed, how fresh the data is, whether delivery pricing is published, whether company details are published, and above all whether products we bought anonymously passed independent lab testing. The exact points for each factor are shown on every vendor page.
5. Blind lab tests
We buy products as an ordinary customer, under a name the vendor does not know, and send them to an accredited laboratory for identity and purity analysis. Vendors are not told in advance and cannot opt out. Results are published whether they pass or fail, with the report attached.
6. Our conflict of interest, disclosed
PeptideCheck is operated by the team behind Revial Labs Ltd (company no. 17254123), which sells peptides at reviallabs.co.uk. We would rather tell you than have you find out. Every Revial Labs row on this site carries an Owner-operated label, is ranked by exactly the same formula as every other vendor, and is bought and lab-tested blind like everyone else.
7. Research use only
Everything listed on PeptideCheck is sold by UK vendors as a research chemical for laboratory use. Nothing on this site is medical advice and nothing here is for human consumption. Prices are updated automatically but can change at any time; the vendor’s own checkout price is final.
Trust score factors
| Factor | Points |
|---|---|
| Live price & stock feed connected (PeptideCheck Connect) | +25 |
| Prices updated in the last 48 hours | +10 |
| Delivery price published | +10 |
| At least one blind lab test passed | +30 |
| Each additional passed test (max +10) | +5 |
| Sales reported server-to-server (commissions verifiable) | +5 |
| Company details published | +10 |
| Discount code published for PeptideCheck visitors | +5 |
| Vendor profile complete | +5 |
| Each failed lab test on record | −40 |
Scores are recomputed automatically whenever the underlying facts change. No factor depends on money paid to PeptideCheck.