Semax
nootropicSemax is a research-use-only peptide. PeptideSource compares suppliers on purity, COAs, and price-per-mg.
Also known as: ACTH 4-10 analog, N-Acetyl Semax, N-Acetyl Semx, N-Acetyl Semax Amidate, NA Semax Amidate
Semax is derived from the corticotropin (ACTH) fragment, which is naturally involved in the body's stress response. This synthetic peptide is engineered to enhance cognitive function and neuroprotection. It functions by modulating the levels of neurotrophic factors and neurotransmitters, thereby influencing brain activity and resilience. Research on Semax began with investigations into its potential to improve memory and learning, stemming from its origins in ACTH studies. Today, it is primarily studied for its effects on:
- Cognitive enhancement
- Memory improvement
- Neuroprotection
- Stress response modulation
It is also being studied for its potential effects on mood and anxiety regulation.
PeptideSource editorial · Updated Jul 18, 2026
For research use only. PeptideSource does not sell peptides directly. Compare third-party supplier listings at your own discretion.
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| Product | Semax | N-Acetyl Semax Non-Lyophilized | N-Acetyl Semax Spray Non-Lyophilized | Semax Premium | Semax | Semax N-Acetyl Amidate | N-Acetyl Semax Premium | N-Acetyl Semax Amidate Non-Lyophilized | N-Acetyl Semax | N-Acetyl Semax Amidate | Semax | N-Acetyl Semax Spray Premium | N-Acetyl Semax Amidate Spray Non-Lyophilized | Semax | N-Acetyl Semax Amidate | Semax | Semax Spray | N-Acetyl Semax Amidate Premium | N-Acetyl Semax Amidate Spray Premium | N-acetyl Semax Amidate | N-Acetyl Semx | Semax | Semax | Semax | Semax | Semax | N-Acetyl Semax Amidate | Semax Nasal Spray -110Sprays:100mcgASpray | Semax | Semax | Semax - |
| Size | 30 mg | 25 mg | 30 mg | 25 mg | 30 mg | 30 mg | 30 mg | 30 mg | 30 mg | 30 mg | 30 mg | 10 mg | 11 mg | 10 mg | 10 mg | 10 mg | 11 mg | 10 mg | |||||||||||||
| Price | $230.00 | $36.59 | $39.59 | $59.99 | $53.00 | $64.99 | $43.45 | $43.99 | $57.00 | $69.00 | $69.00 | $46.45 | $46.99 | $73.95 | $75.00 | $75.00 | $76.99 | $81.99 | $84.99 | $89.00 | $89.00 | $29.99 | $37.50 | $42.99 | $42.00 | $49.00 | $49.99 | $55.99 | $59.00 | $83.99 | $46.00 |
| Price/mg | $1.15/mg | $1.83/mg | $1.98/mg | $2.00/mg | $2.12/mg | $2.17/mg | $2.17/mg | $2.20/mg | $2.28/mg | $2.30/mg | $2.30/mg | $2.32/mg | $2.35/mg | $2.47/mg | $2.50/mg | $2.50/mg | $2.57/mg | $2.73/mg | $2.83/mg | $2.97/mg | $2.97/mg | $3.00/mg | $3.75/mg | $3.91/mg | $4.20/mg | $4.90/mg | $5.00/mg | $5.09/mg | $5.90/mg | $8.40/mg | $9.20/mg |
| Price change | 0% (10d) | 0% (16d) | 0% (16d) | 0% (16d) | 0% (16d) | 0% (10d) | 0% (16d) | 0% (16d) | 0% (16d) | 0% (10d) | 0% (10d) | 0% (16d) | 0% (16d) | 0% (16d) | 0% (10d) | 0% (10d) | 0% (16d) | 0% (16d) | 0% (16d) | 0% (10d) | 0% (16d) | 0% (10d) | 0% (10d) | 0% (10d) | 0% (10d) | 0% (10d) | 0% (10d) | 0% (10d) | 0% (10d) | 0% (10d) | 0% (10d) |
| Stock | Out of stock | In stock | In stock | Out of stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | In stock | Unknown | In stock |
| Shipping | Reliable US shipping | 5–7 days | 5–7 days | 5–7 days | Same-day dispatch | UPS 2-Day | 5–7 days | 5–7 days | Same-day dispatch | Same-day dispatch before 12PM EST | Same or next-day shipping | 5–7 days | 5–7 days | 3–5 days | Same/next-day dispatch | Same/next-day dispatch | 5–7 days | 5–7 days | 5–7 days | Same or next-day shipping | 2–5 days | UPS 2nd Day Air | 2–3 days | Same-day US shipping | Same-day dispatch before 12PM CT | US shipping | UPS 2nd Day Air | Same-day US shipping | Same-day dispatch before 12PM EST | US shipping | Same-day dispatch before 1PM PST |
| Reviews | 5.0(3) | 4.3(159) | 4.3(159) | 4.3(159) | 4.9(15) | 4.8(75) | 4.3(159) | 4.3(159) | 4.9(15) | 5.0(1) | 4.2(46) | 4.3(159) | 4.3(159) | 2.6(12) | 1.0(4) | 1.0(4) | 4.3(159) | 4.3(159) | 4.3(159) | 4.2(46) | 4.8(271) | 5.0(6) | 5.0(22) | 4.7(31) | 4.6(63) | 5.0(9) | 5.0(6) | 4.7(31) | 5.0(1) | 2.0(4) | — |
| Purity | 99.99% | 99% | — | 99% | 99% | 99% | 99% | 99% | 99% | — | — | — | — | 99% | 99% | 99% | — | 99% | — | — | 99.15% | 99% | 99% | 99% | — | 99% | 99% | 99% | — | 99% | 99% |
| COA | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||||||
| Bulk discount | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 10% off (3+) | — | — | — | — | — | — |
Blends that contain Semax
Multi-peptide products that include Semax as an ingredient.
