A synthetic peptide derived from a fragment of ACTH, studied in preclinical research as a nootropic/cognitive-research compound. The Peptide Index files it under Nootropic peptide.
As of Sep 25, 2026, the lowest listed price is $1.03/mg and the median current listing is $4.50/mg, across 126 vendors (168 comparable single-compound listings). Prices are normalized to US dollars per milligram of peptide, exclude shipping, and are refreshed nightly.
In the nightly price history, the daily median rose from $4.05/mg on Jul 14, 2026 to $5.00/mg on Sep 25, 2026 (+23.4%), based on 67 observed days. Days the crawl missed are left out, not filled in. The daily series is taken across each day’s comparable listings, so it can differ slightly from the current-listings median above. See the full Semax price history chart.
| Vendor | $/mg | Price (USD) | Package |
|---|---|---|---|
| Peptide Partners | $1.03/mg | $310.50 | 300mg vial |
| Bio Strategix | $1.50/mg | $60.00 | 40mg vial |
| Imperial Peptides | $1.57/mg | $46.99 | 30mg vial |
| GenX Bio | $1.67/mg | $50.00 | 30mg vial |
| PureRx Peptides | $1.80/mg | $18.00 | 10mg vial |
Each vendor name links to its public-record trust profile. The Semax price page lists every current listing.
Every night The Peptide Index reads vendors’ public catalog pages, records the listed price and stated peptide content, and divides one by the other to get a comparable $/mg. Blends and topical/cosmetic products are excluded from single-compound figures. Read the full methodology and how vendor signals are checked.