Methodology
We publish how we rank vendors so you can decide whether our judgments are useful for you. No hidden weights, no pay-to-play default sort.
Default sort
On peptide pages and best-value comparisons, the default sort is normalized price per milligram, lowest first. Vial sizes vary across vendors; price-per-mg is the only fair comparison.
Transparency score
Each vendor receives a 0–100 transparency score based on signals we can verify from their public site:
- Whether a Certificate of Analysis (COA) is publicly linked
- Whether the COA is lot-specific or general
- Whether a third-party lab is named
- Whether the report date is visible
- Whether purity and identity data are visible
- Product detail completeness
- Refund and shipping policy clarity
- Vendor consistency over time
Scores map to badges: Excellent (85+), Strong (70–84), Moderate (50–69), Weak (25–49), Unknown (below 25 or insufficient data).
Third-party verified
On best-value comparisons we show a per-row Third Party Verified column. A checkmark means we have at least one independent purity test on file for that (vendor, peptide) pair, aggregated from Finnrick Analytics. An em-dash means we do not have a third-party test on file — not a claim that the product is untested or impure. Tests reflect historical batches and may not represent the inventory shipping today.
What we do not include
- Affiliate payout rates do not affect default sort or transparency score.
- Sponsored placements, when present, are clearly labeled and ranked separately.
- We do not provide dosage, protocol, or treatment recommendations.
Data freshness
Vendor data is refreshed daily by automated agents. Each offer shows a last-verified timestamp. Stale offers are archived after 30 days without verification.