Effective mg, risk-adjusted cost, and transparent policies. Current Top 5 included.
Cheap ≠ good. We score value by effective mg and risk-adjusted cost.
Include shipping, discounts, failed deliveries, and the cost of rework from documentation gaps.
Coupons can distort comparisons. We normalize by price-per-mg after standard shipping and typical discounts.
Ask for recent lot-specific COAs. If unavailable, mark down value regardless of price.
See the Top 5 table below. We track volatility and note sudden price swings in change logs.
| Rank | Supplier |
|---|---|
| #1 | OathPeptides Editor’s Choice — research-first, consistent COAs |
| #2 | Peptide Sciences Established catalog, US-based |
| #3 | Biotech Peptides Custom synthesis options |
| #4 | Core Peptides Broad catalog, fast shipping |
| #5 | Blue Sky Peptide Budget-focused |
Listings are for research purposes only. No medical use is implied. Watchlist: Paradigm Peptides, Limitless Life Nootropics, Nootropics Depot.
Use primary sources to verify claims; interpret within each study’s limits.