How we rate shops and where codes come from
Plain rules, written down: who comes first, how scores are estimated, what we do with missing facts and why codes need a verified email.
Who sits at the top, and why
Some shops on PeptDeals are affiliate partners. They give us their coupon codes, and we earn a commission when you order through our links. That can influence their placement: the three shops at the top of our ranking are partners. Every other shop is sorted by its overall score.
Some shops on this site are affiliate partners: we earn a commission on purchases through our links, and this can influence their placement.
Where shop data comes from
Scores and facts for the other shops come from public information only: the shop's own website where we could confirm one, and public directories such as PeptidesLookup. Each profile lists its sources. Public ratings are shown as published, with the review count; if a shop has no buyer reviews there, we say so. Where we couldn't confirm a shop's own website, the profile links to its directory listing instead.
The five criteria
Each shop gets an editorial estimate from 0 to 10 per criterion, based on the information the shop itself publishes (website, terms, product pages). We have not lab-tested products. The overall score is the weighted average:
Purity & testing
30%Stated purity, independent HPLC/MS testing, batch-level COAs.
Transparency
20%Identifiable operator, imprint, clear terms and contact options.
Price & value
20%Price level, free-shipping threshold and how generous the coupons are.
Shipping
15%EU coverage, speed, discreet packaging, tracking.
Support
15%Reachable contact channels and how problems get resolved.
Overall = 0.30 × Purity + 0.20 × Transparency + 0.20 × Price + 0.15 × Shipping + 0.15 × Support
Unknown facts stay unknown
If a shop doesn't publish something (payment methods, lab reports, refund policy, founding year…), we show “Not published” instead of filling the gap. When a shop publishes new information, we update the profile and, if needed, the score.
Where our codes come from
- Codes come straight from the shops, including codes that only exist on PeptDeals. Shops without a code show “No code” — we don't list codes we haven't been given.
- Minimum order, expiry date and other conditions are shown on every coupon card under “Terms”.
- Codes disappear from the site automatically on the day they expire.
- Shops can change or withdraw a code; if one fails, tell us and we follow up with the shop.
Why we ask for your email
Codes are hidden until you confirm your email with a 6-digit code or Google sign-in. That keeps codes from being scraped and shut down.
One verification unlocks every code on PeptDeals for 180 days, and we email you a copy of each code you unlock. Every email has a one-click unsubscribe.
Reviews come only from verified emails
We never write or import user reviews. A review appears only after its author verified their email and it passed moderation. If a shop has no reviews yet, we show none — no placeholder ratings, no made-up counts.
What we don't do
We don't publish dosing, usage or medical information. The shops sell research peptides, so we only look at them as vendors: documentation, price, shipping and support.