🔄 Updated 2026 — Reviewed and refreshed with the latest research.
Quick Summary
- Selank: anxiolytic-nootropic heptapeptide — calm focus, BDNF, GABAergic
- Semax: stimulatory ACTH-analogue — drive, BDNF, dopamine, neuroprotection
- Both: Russian-developed, clinically studied, administered as nasal spray or SubQ
- Key differentiator: Real neuroscience — not just caffeine with a fancy name
- Tony’s angle: Use Semax for high-output work sessions, Selank for baseline anxiety and learning
While Silicon Valley biohackers were microdosing psilocybin and taking Lion’s Mane capsules, Russian scientists were developing some of the most potent cognitive-enhancing peptides ever studied. selank and semax were both developed at the Institute of Molecular Genetics of the russian Academy of Sciences, and they represent a completely different class of nootropics — ones that actually work through validated neuroscientific mechanisms.
What Is Selank?
Selank is a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) based on the sequence of tuftsin, a natural immunomodulatory peptide. Approved in Russia as an anxiolytic and nootropic drug. Primary mechanisms:
- GABAergic modulation (anxiolytic without sedation or dependence)
- Increases BDNF (brain-derived neurotrophic factor)
- Modulates serotonin and dopamine systems
- Immune regulation via IL-2 upregulation
- Inhibits enkephalin-degrading enzymes
What Is Semax?
Semax is an ACTH(4-7) analogue — synthetic fragment of adrenocorticotropic hormone with additional amino acids for stability. More stimulatory than Selank:
- Massively upregulates BDNF and NGF
- Increases dopaminergic and serotonergic activity
- Neuroprotective against ischemia and hypoxia
- Enhances memory formation and recall
The tony huge laws of biochemistry physics — Law 5: Independent Receptor Stacking
This is a textbook illustration of the tony huge Laws of Biochemistry Physics — specifically Law 5, Independent Receptor Stacking. Selank operates primarily through GABAergic and tuftsin receptor pathways. Semax operates through ACTH receptor fragments and direct NGF/BDNF upregulation. These are independent systems converging on the same outcome — enhanced cognition. Stacking them hits different pathways without diminishing returns. The morning Semax + afternoon Selank approach maximizes throughput from both independent pathways simultaneously.
Selank vs semax: Head-to-Head
| Property | Selank | Semax |
|---|---|---|
| Effect Profile | Calming, anxiolytic | Stimulatory, drive-enhancing |
| BDNF Increase | Moderate | Strong |
| Best Use | Baseline anxiety, learning | High-output cognitive work |
| Timing | Morning or PM | Morning only |
Natural Plus Protocol — Dosing
- Selank: 250-3000 mcg/day, 1-2x daily via nasal spray or SubQ
- Semax: 200-3000 mcg/day, morning (stimulatory — avoid evening)
- Stack timing: Semax AM + Selank PM for complementary all-day coverage
- Cycle: 2-4 week cycles or as-needed
Timeline: What to Expect
| Timeframe | What to Expect |
|---|---|
| Day 1-3 | Noticeable anxiety reduction (Selank) and mental energy (Semax) |
| Week 2 | Improved memory consolidation and recall speed |
| Week 4 | Measurable cognitive performance improvements on reaction time tests |
References
- Semenova TP et al. “Cognitive enhancing and anxiolytic properties of Selank.” Bull Exp Biol Med, 2010.
- Agapova TY et al. “Selank and regulation of gene expression related to GABA system.” Doklady Biochemistry, 2011.
- Shadrina MI et al. “Expression analysis of neuroprotective effect of Semax.” J Mol Neurosci, 2010.
See the complete cognitive optimization framework at Enhanced Athlete Protocol Peptides.