Semax vs Selank
Research & educational use only. This content is not medical advice. Consult a qualified healthcare professional before using any peptide compound.
Semax and Selank are both cognitive peptides that come up together constantly. This is a side-by-side comparison on the data that actually matters — evidence tier, FDA status, human trials, and how to source each safely — not hype. It is for research and educational purposes only.
Semax vs Selank: side-by-side
| Semax | Selank | |
|---|---|---|
| Evidence tier | Tier 2 | Tier 2 |
| FDA status | Investigational | Investigational |
| Human RCTs | 2 | 2 |
| Subjects enrolled | 140 | 110 |
| Animal studies | 30 | 25 |
| Category | cognitive | cognitive |
| Half-life | Short plasma half-life; intranasal route common. | Short plasma half-life; intranasal administration common in studies. |
| Community logs | 1 | 0 |
Key differences
Both Semax and Selank sit at the same evidence tier (Tier 2), so neither has a clear edge in how strong its human data is. Neither is FDA approved for human use — both are investigational / investigational and treated as research compounds in the US.
Semax has 2 human trials on record (140 subjects) versus Selank's 2 (110 subjects). Evidence tiers are a shorthand for how strong that human data is — see our guide to understanding peptide evidence tiers for how to weigh them.
What is Semax?
Semax is a synthetic peptide analog of a fragment of adrenocorticotropic hormone (ACTH 4-10), developed in Russia for cognitive and neuroprotective applications. Human clinical use is reported in Russia for stroke and cognition, but it is not FDA-approved and independent randomized controlled trials are limited. It is… Full Semax breakdown →
What is Selank?
Selank is a synthetic heptapeptide derived from the immunomodulatory peptide tuftsin, developed in Russia as an anxiolytic. Some human clinical reports from originating institutions describe anti-anxiety effects, but it is not FDA-approved and lacks large independent randomized controlled trials. It is used in… Full Selank breakdown →
Where to buy Semax or Selank safely
Both are sold by research-chemical suppliers, not pharmacies, so the source matters as much as the compound. Before buying either, vet sellers on third-party lab testing and enforcement history in the ranked directory of trusted peptide sellers — or jump straight to vetted sources for Semax or Selank. PeptidesHub does not sell either compound.
Frequently asked questions
Semax and Selank are both cognitive peptides. Both Semax and Selank sit at the same evidence tier (Tier 2), so neither has a clear edge in how strong its human data is. Neither is FDA approved for human use — both are investigational / investigational and treated as research compounds in the US. See each compound's full evidence breakdown for the underlying studies.