How we score, and why it matters.

Pepticker is a neutral, evidence-backed price comparator. We don't sell peptides, we don't run paid reviews, and we disclose every affiliate relationship inline with the rankings they inform.

Seven categories, one grade

Every tracked vendor is measured on a public 7-category rubric. One point per category. 6.5+ earns an A, 5.5+ a B, 4.5+ a B-, below that a C or lower.

1. 01
   Identity verified

   Independent lab confirms peptide sequence matches label.
2. 02
   Net content confirmed

   Vial weight and active content match stated dose.
3. 03
   Net purity ≥ 97%

   HPLC or equivalent purity assay at or above 97%.
4. 04
   Endotoxin tested

   Bacterial endotoxin levels within accepted limits.
5. 05
   Sterility tested

   Microbial contamination screening performed.
6. 06
   Heavy metals screened

   Tested for lead, cadmium, mercury, arsenic.
7. 07
   Conformity documented

   Batch COA matches the specific lot shipped.

COAs must be from named independent labs (Janoshik, Kovera, Finnrick, MZ Biolabs, ILS Labs). Vendor self-reports do not count. COAs older than 3 months do not qualify.

Crawl cycle & freshness

Prices are scraped from vendor storefronts every 4–6 hours. Every price carries a timestamp. Historical data is retained for 365 days and surfaces as a chart on every peptide page.

What it takes to get listed

A vendor must publish a research-use-only disclosure, provide batch COAs for at least 80% of listed SKUs, have been operational for at least 3 months with no unresolved public complaints, and have a verifiable business address. Inclusion does not require an affiliate relationship.

How we're paid, and how we rank

Most outbound vendor links carry an affiliate identifier. We earn a commission when you purchase through these links, at no extra cost to you. Commission rates do not influence vendor ordering — default sort is price-per-milligram ascending, and the directory is sorted by testing grade.

Nothing on this site is medical, legal, or regulatory advice. All products are listed for research use only. Consult qualified professionals before acting on anything you read here.