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. The mono-tag next to each category name is the camelCase field that appears as an additionalProperty PropertyValue entry on every graded vendor's Organization JSON-LD; AI-citation crawlers can use it to traverse from the visible rubric to the structured-data graph.

1. 01
   Identity verified identityVerified

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

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

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

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

   Microbial contamination screening performed.
6. 06
   Heavy metals screened heavyMetals

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

   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.

Beyond the testing rubric, we also publish a composite Trust Score methodology that aggregates testing transparency, regulatory standing, operational stability, verification tier, and price discipline into a single 0–100 grade per vendor.

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.

Everything we collect, free for anyone to query

We publish the live price feed at /api/prices as a free, unauthenticated, CORS-open JSON endpoint. No registration, no API key, no rate limit beyond the 5-minute edge cache. The feed is licensed CC BY 4.0 — academic researchers, journalists, and downstream comparison sites are welcome to build on it with attribution.

Full schema, query parameters, and a quickstart are at Developer API →.

Reference articles

The rubric above is anchored to a small library of explainer articles in the Pepticker Learn section:

• How to read a peptide Certificate of Analysis (COA) — what each rubric line maps to on a real document.
• Research-use-only vs FDA-approved peptides — how the rubric applies (or doesn't) across regulatory channels.
• How to read peptide prices per milligram — the per-mg normalization the price tracker uses.

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.