Peptide price index

Data source

Prices are scraped from provider and vendor websites by the PeptideBase pipeline, refreshed weekly. Only rows with extraction_confidence of high or medium are included. Low-confidence extractions — where the parser could not reliably identify quantity or unit — are excluded entirely.

mg normalization

Only rows with quantity_unit = 'mg' and a populated price_per_mg_usd are included. Products priced by vial, kit, or unit without a known mg weight are excluded because cross-vendor comparison requires a common denominator.

Winsorization

Before computing percentiles, prices are winsorized at the 5th and 95th percentile within each peptide. Values below p5 are raised to p5; values above p95 are capped at p95. This removes the distorting effect of outlier SKUs (e.g., bulk quantities priced at a fraction of standard retail, or single-unit listings at 10× market rate) without discarding the underlying data point entirely.

Percentile bands

p25 (budget end), median, and p75 (premium end) are computed in SQL using PERCENTILE_CONT on the winsorized values. These are the exact figures shown — no additional transformation is applied in the application layer. A peptide appears only when ≥ 5 distinct active vendors have qualifying price rows.

Active vendors only

Prices are joined to the providers table and filtered to status = 'active'. Inactive or removed vendors are excluded.

Independence

PeptideBase accepts no payment for inclusion or ranking in this index, and takes no affiliate commission on vendor sales. Every peptide that clears the ≥ 5-vendor threshold is included automatically, and the percentile figures are produced by SQL from scraped data — they are not curated, hand-ranked, or sold. PeptideBase surfaces independent third-party vendor grades where available; it does not test products itself.

Research use context

Most prices in this index are from research-use vendors. These compounds are sold for research purposes only and are not intended for human use. Clinical program pricing (telehealth, compounding pharmacy with prescription) follows a different model and is not captured here — see the cost of peptide therapy guide for that. Do not use this index as a clinical pricing reference.