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Suppliers list peptides in different vial sizes and concentrations, making direct price comparison difficult. PeptideSource normalizes each listing to a price-per-milligram by dividing the listed price by the total peptide content in milligrams. For example, a 5 mg vial at $50 equals $10/mg, while a 10 mg vial at $80 equals $8/mg — the smaller vial appears cheaper at face value, but the per-mg metric reveals the better deal. Prices are sourced from publicly available supplier listings and updated on a regular scrape schedule. Always confirm current pricing with the supplier before purchasing.

Trust scores on PeptideSource are informational ratings (not endorsements or guarantees) that help you prioritize which suppliers to research further. They combine several signals when available: 1. Verification status — whether the supplier profile and key claims have been reviewed on our platform. 2. COA consistency — whether Certificates of Analysis appear across listings with coherent purity and batch documentation. 3. Listing accuracy — how cleanly public catalog data normalizes (pricing, mg, stock) after admin review. 4. Community feedback — approved reviews and ratings from researchers on PeptideSource. A higher score generally means a longer track record of transparent documentation and consistent listings. Always conduct your own due diligence before purchasing from any vendor.

Research use only (RUO) means peptides listed on PeptideSource are intended for laboratory and research purposes — not for human consumption, clinical treatment, or diagnostic use. PeptideSource is an information platform for researchers comparing suppliers and quality data. We do not sell, distribute, or facilitate the purchase of peptides. Nothing on this site constitutes medical advice.

Our data pipeline works in three stages: 1. Collection — We gather publicly available supplier listings from vendor websites on a scheduled basis. 2. Normalization — Raw listing data is parsed and standardized into a consistent format (title, price, mg, purity claims, stock status, and more). 3. Review — Normalized listings enter an admin review queue before appearing on PeptideSource. Our team verifies peptide matching, flags anomalies, and approves or rejects each entry. COA documents and pricing are attributed to the original supplier. PeptideSource aggregates and organizes this information but does not independently test products. Spotted an error? Use Contact → Data corrections.