Semax vs Selank
Compare the research, key figures and safety notes.
How they differ
Two short Russian nasal-spray peptides, both gone from the blood within minutes. Semax leans toward focus and alertness; Selank leans toward calm. Both have some human use behind them, but the evidence is mostly Russian-language studies rather than large Western dosing trials.
Side by side
| Measure | Semax | Selank |
|---|---|---|
| Category | Cognitive | Cognitive |
| Evidence | B · Limited human evidence | B · Limited human evidence |
| Route | Intranasal | Intranasal |
| Half-life | 0.5 h | 0.5 h |
| Typical vial | 5 / 10 mg | 5 / 10 mg |
| Research amount | 200–600 mcg | 250–500 mcg |
| Common schedule | Every day | Every day |
| Cycle / break | 2–4 / 1–2 | — |
| Studied for | Focus and mood | Focus and mood |
These amounts and schedules are figures discussed in research and community reports, shared for learning — not a recommendation and not medical advice. A step-by-step dosing schedule exists only where a human trial backs it; the evidence tier tells you which.
Decay curves, overlaid
Each line is scaled to that compound's own first dose, so the chart shows how each one builds up over time — not how the compounds' doses compare to one another, which these different molecules share no common unit for.
How they combine
Educational reference on commonly-discussed combinations, not medical advice. Combining compounds can change how each behaves — read this as a prompt to research, not a clearance.