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 ≥ 8 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

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.