How we rank. Why it matters.
PeptideCompare is a non-profit initiative. We have no financial relationship with any supplier. Our standards define exactly how we assess, rank and verify every product and supplier.
The ranking formula
Every price row is scored on three weighted factors. A lower price is rewarded, but never at the expense of purity or independent verification.
€/mg relative to the cheapest verified option in the same size class.
COA-stated purity %, with a bonus for independently confirmed lab values.
COA presence, lab independence, and whether the product was personally ordered and reviewed.
Out-of-stock products get a −1.5 point penalty on sort order — this never affects the displayed score itself.
Four levels of certainty
Every badge is earned through independent verification — not purchased, not self-reported.
CMI Verified
An anonymous real order placed and independently reviewed — delivery time, packaging, labelling and customer service.
COA Verified
Lab certificate checked per product and vial size, issued by an independent accredited lab.
Product Verified
Independently assessed on reconstitution, appearance and 30-day cold-storage stability. No human or animal testing.
Most Extensively Tested
Full test panel per batch: identity, 7 heavy metals, endotoxins & microbial — verified via Liquilabs.
Data policy
Update frequency
Prices are manually checked and updated monthly. Suppliers get 7 days to correct inaccurate data before a listing is flagged.
No paid placement
PeptideCompare accepts no payment for ranking, featured placement or badge status. Badges are earned only.