Document-level evidence
The current index contains a certificate document naming this vendor and Cortagen, with printed fields such as date, lab, lot, or reported purity when available.
14 current listings from 14 vendors, ranked by observed cost per milligram and checked for a COA indexed to the same vendor + peptide pair.
$32 / 20mg · $1.60/mg
$/mg = observed price ÷ vial size. Prices and stock can change; confirm on the vendor site. COA “matched” means same vendor + peptide, not proof that the listing is the tested batch. Some outbound links are affiliate links.
The current index contains a certificate document naming this vendor and Cortagen, with printed fields such as date, lab, lot, or reported purity when available.
The document does not establish authenticity, chain of custody, vial contents, sterility, endotoxin status, safety, efficacy, or overall vendor quality.
Across 14 current listings from 14 tracked vendors, Cortagen ranges from $1.60/mg to $4.10/mg, averaging $2.94/mg. The cheapest observed listing is Grey Axis Research at $32 for a 20mg vial.
The lowest observed Cortagen price is $1.60 per mg at Grey Axis Research, about 46% below the current listing average. Cost-per-mg (price ÷ vial size) makes different vial sizes comparable. Confirm the current price and stock on the vendor site.
Cortagen has current observations from 14 research-peptide vendors we track, including Grey Axis Research, Pure Health Peptides, Aminologix. This page compares 14 listings by cost-per-mg and links to the vendor. Some outbound links are affiliate links.
6 of the 14 tracked vendors have a current indexed COA document matched to the same vendor and Cortagen; 6 of those documents have a printed test date within 18 months. A match identifies document evidence for the pair. It does not link a listing to the tested batch or establish authenticity, sterility, safety, or vendor quality.
The listings compared here are sold as research-use products, not as approved medicines. Rules vary by product and jurisdiction. This page is informational, not medical or legal advice. Check the listing and your local regulations.