Semax vs Selank
Verdict: Same Russian research lineage, opposite temperaments. Semax is the accelerator: an ACTH(4-10) analog studied for focus, processing speed and BDNF elevation — users describe it as stimulating without being a stimulant. Selank is the brake: a tuftsin analog with anti-anxiety effects compared in Russian trials to benzodiazepines, minus sedation and dependence. Pick by your bottleneck — scattered focus points to Semax, anxious rumination points to Selank — and know that many protocols simply alternate: Semax for work hours, Selank for evenings or high-stress days.
Side by side
| Semax | Selank | |
|---|---|---|
| Typical dose | 200 mcg–600 mcg | 200 mcg–500 mcg |
| Frequency | daily | daily |
| Administration | intranasal or subcutaneous | intranasal or subcutaneous |
| Common vials | 5 mg, 10 mg | 5 mg, 10 mg |
| Typical mix | 5 mg + 2 ml water | 5 mg + 2 ml water |
| Units for typical dose | 12 units (300 mcg) | 10 units (250 mcg) |
Mechanisms in brief
Semax raises BDNF and modulates dopaminergic/serotonergic signaling — the neuroplasticity angle explains both the cognitive claims and its Russian clinical use post-stroke. Selank works on GABAergic tone and enkephalin degradation, the same broad territory as anxiolytic drugs but through gentler modulation rather than direct receptor agonism.
Both are intranasal-first
Unusually for peptides, the standard route is nasal spray or drops — the nasal epithelium offers a partial path toward the CNS. Typical amounts run 200–600 mcg per day, often split. Injectable use exists but adds no established benefit for these two; if you're reconstituting for a spray, the calculator still applies (peptide mg ÷ water ml = concentration per spray volume).
Evidence honesty
Nearly all published human data comes from Russian and Eastern European research, where both are approved medicines. Western replication is thin. That doesn't make the data wrong — but it makes independent third-party testing of what you actually bought more important than for Western-trial compounds.
Can you stack them?
They stack with each other cleanly (different mechanisms, no overlap) — the common pattern is Semax mornings, Selank as needed. Neither belongs in the same conversation as injectable GH or healing stacks.
More comparisons
Educational comparison based on commonly published research protocols — not medical advice or an endorsement of any compound.