Independence & methodology
How We Rate Peptide Vendors
PeptidePrices is independent. We are not owned by any peptide vendor, lab, or reseller. We aggregate publicly available pricing and publish quality scores based on transparent criteria. You deserve to know exactly how we decide who to recommend — and who to avoid.
Our commitments
- No vendor has ever paid us to increase their score. Ever.
- We disclose affiliate relationships everywhere they appear. When we earn commission from a vendor click, we say so on the vendor page, in the footer, and in our about page.
- Affiliate-partner vendors often score higher — and we're upfront about why. A commercial relationship gives us direct visibility into their COA cadence, customer-service responsiveness, and batch-testing schedule that arms-length audits can't reach.
- Scores update as evidence changes. A new batch of complaints or a failed lab test drops the score immediately, partner or not.
- We publish our methodology openly so you can challenge it, including the page you're reading right now.
- We never sell or publish your search history, email, or watchlist data.
The Quality Score formula
Each vendor gets a 1–10 score composed of four weighted factors, heavily favoring verifiable lab testing:
What the score means
Years of consistent positive reviews, public COAs, transparent ownership. Safe to research with confidence.
Good community reputation, COAs available, reliable operation. A few minor concerns or limited review volume.
Legitimate operation but with some red flags: inconsistent reviews, unclear policies, or limited track record.
New or thinly-reviewed vendors. Not necessarily scams, but we can't verify enough to recommend.
Known scams, documented customer complaints, or vendors with repeated quality issues.
How we rate compound safety
The Safety Rating (X/10) shown next to each compound is separate from the vendor Quality Score. It is a PeptidePrices editorial assessment — not clinical advice — built from four inputs:
- Clinical literature — depth and phase of published human/preclinical research (peer-reviewed sources, ClinicalTrials.gov).
- Adverse-event reporting — documented side-effect and tolerability signals in the literature.
- Regulatory status — FDA/EMA status, warning letters, investigational-vs-approved status.
- Compound profile — class, mechanism, and known interactions/contraindications.
It is a relative research heuristic, not a medical opinion, and — like vendor scores — it is unaffected by affiliate relationships. The full per-compound scale lives on each compound's /safety page. All compounds are for research use only.
Why scores change
Vendor scores are not static. A vendor that was rated 8/10 six months ago can drop to a 4/10 today if a wave of customer complaints appears on Reddit or if a batch fails an independent lab test. We review scores quarterly, and we push emergency updates whenever material evidence surfaces.
Conversely, new vendors start at a low score (often 3-5) regardless of their marketing claims. A 3/10 rating is not an accusation — it means we can't verify enough to recommend yet.
Found a mistake?
Prices change. Vendors go offline. New reviews surface. If you find incorrect data, email us and we will update the site immediately.
support@peptideprices.net