Semax
A Russian-developed focus and brain-protection peptide, sold there as a prescription nasal spray.
Also listed as ACTH 4-10, N-Acetyl Semax.
Peptide Compare tracked 58 vendors selling Semax on 9 Oct 2026. The cheapest in-stock 30 mg vial is $2.27 per mg at Paramount Peptides, 14% under the $2.62 median. Prices are scraped from vendor sites; trust scores come from Finnrick blind tests.
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Best value right now · 30 mg
Paramount Peptides
IN STOCKTRUST 6.7
Per mg14% under the $2.62 median
Vial price30 mg · verified Oct 9
Avg per mg · 30 mg
$4.60+129.8%
Ranged $2.00 – $4.93 across 58 vendorsCompare 12 vendors · 30 mg
Across all sizes, verified in-stock listings run $20.00 to $256.31 from 33 vendors.
VendorStock
04
Solution PeptidesUNTESTED · OUT
$1.17$35.00
09
Verified PeptidesUNTESTED · OUT
$2.97$89.00
11
Good ScienceUNTESTED · OUT · 20% OFF
$3.47$104.00$130.00
12
SwissChemsTRUST 4.0 · OUT
$24.65$739.50
Showing 8 of 12 vendors · 4 more from $2.97/mg
Semax prices verified Oct 9, 2026
$2.27/mgParamount Peptides · $68.00
Buy best priceSee how Semax moved against the rest of the catalogue in the Peptide Price Index: median price per mg now versus 30 and 90 days ago, every tracked peptide, with a CSV.
Semax price by vial size
| Vial size | Lowest per mg | Vial price | Vendor |
|---|---|---|---|
| 5 mg | $4.40 | $21.99 | Modern Research12 vendors carry it |
| 10 mg | $2.20 | $20.00 | Bio Pepz43 vendors carry it |
| 20 mg | $3.25 | $64.97 | BioLongevity Labs1 vendor carries it |
| 30 mg | $2.27 | $68.00 | Paramount Peptides12 vendors carry it |
| 50 mg | $2.64 | $132.20 | Sunrise Bioresearch3 vendors carry it |
| 100 mg | $2.56 | $256.31 | Sunrise Bioresearch1 vendor carries it |
| Other | $2.12 | $53.00 | Biotech Peptides4 vendors carry it |
Verified 9 Oct 2026. Lowest figures are in-stock listings checked within the last week, with any coupon applied; a size with none says so.
Price movement · 30 days
0%median per mg, all sizes
Cheapest ever recorded: $0.840/mg on Aug 7. Today is 152.4% above that low.See our top-ranked Semax vendors
Ranked by Finnrick trust score, independent lab testing, and price.
Compare Semax head-to-head
- Semax vs Dihexa
- Semax vs Selank
- Semax vs DSIP
- Semax vs Selank + Semax
- Semax vs Adamax
- Semax vs Cerebrolysin
Quick Summary
A synthetic analogue of a fragment of ACTH, registered in Russia as an intranasal prescription medicine and studied there in stroke patients. Available from 58 vendors, priced from $20.00 to $739.50.
Research: Gusev et al, Zh Nevrol Psikhiatr Im S S Korsakova 2018;118(3 Vyp 2):61-68 (PMID 29798983) studied 110 stroke patients and reported higher BDNF levels and faster Barthel index improvement in the treated group. The paper reports no p-value and no effect size, so the word significant does not belong on this figure. The study was single-centre, Russian-language and not placebo-controlled.
Side effects: Listed on the Russian package insert rather than measured in a trial adverse event table: nasal irritation, headache, dizziness
Approved in RussiaRegistered in Russia since 1994 as an intranasal prescription medicine. Not approved by the FDA or the EMA.
- 49 of 58 vendors currently have it in stock
- Highest-rated vendor: Risynth Bio (9.1 Finnrick score)
- Most common vial size: 10mg
- Category: Cognitive / Neuro — Nootropic and neuroprotective peptides
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