Skip to content
← Index board

Health Optimization Index

Semax

Nick’s assessment
Favorable
Research evidence
C, mixed evidence
Attention
16.8 / 100▼ Falling this week
7.1/ 10

BioHarmony score

Semax is a Russian-developed ACTH 4-7 + PGP heptapeptide with the strongest human signal in post-stroke recovery, including a 110-patient Gusev et al. 2018 study and older Gusev et al. 1997 clinical report, but no eligible recent Western RCT or meta-analysis was found.

Read the full report Benefits, risks and practical guidance.

Read Nick’s assessment Why it earned this rating

Semax is a 7.0–7.5/10 fit for people considering cognition focus, neuroprotection, memory, stress resilience, with the strongest case in the populations already represented by the evidence rather than broad wellness use. Dolotov 2006 and Tsai 2007 give the report its main anchors. The benefits are context-dependent and the evidence still leaves responder, dose, and long-term questions open. Semax makes the most sense when the target is concrete, such as a lab marker, symptom pattern, training limitation, or recovery bottleneck. It makes less sense as a background habit taken on faith. In practice, treat Semax as a tracked experiment: define the outcome first, watch for tradeoffs, and let the response decide whether it earns a place.

✅ Best for: Semax is best for experienced nootropic users who want a fast-acting focus experiment with more mechanistic depth than most gray-market peptides; adults interested in neuroprotection who understand the difference between Russian clinical signals and Western guideline-grade proof; researchers or clinicians in countries where Semax is legally available; and older adults exploring post-stroke or neurorecovery-adjacent interventions with medical supervision. It is most defensible when used after sleep, exercise, nutrition, and baseline cognitive-health work are already handled.

❌ Avoid if: Avoid Semax during pregnancy or breastfeeding, with seizure history, high baseline anxiety, unstable psychiatric symptoms, MAOI use, or psychiatric medications unless a clinician clears it. Avoid it if you need an FDA-approved, guideline-endorsed intervention for stroke, cognitive decline, ADHD, depression, or TBI. Athletes should treat Semax as anti-doping-risky because WADA S0 can apply to non-approved pharmacological substances. Also avoid if you are unwilling to accept gray-market purity and import-law uncertainty.

Share your experience

Your answers are optional and help other readers — they never change my score. How community input works.

Tried it in real life?

How would you assess it?

Favorable is the strongest rating, followed by Promising, then Experimental. Overhyped means the claims outrun the evidence or interest is fading.

Make a 12-month prediction Will it rise or fall in the Index?

Choose a direction and your confidence. Correct predictions earn leaderboard points.

Your 12-month call on Semax
How sure are you?

Your prediction is final once submitted. We’ll check it in 12 months. See the leaderboard →

Updated Sep 21, 2026 How the Index ranks →

Educational information, not medical advice. Ask a qualified clinician about risks and interactions. Independent ratings: no affiliate links, sponsored placements or paid rankings.