Comparison
Semax vs Selank
Focus vs calm. Both are Russian-developed intranasal peptides, both are prescription nootropics, and they're designed to be used together.
The Short Answer
Semax sharpens cognition by upregulating BDNF. Selank reduces anxiety by modulating GABA. Together they produce focused calm — enhanced cognitive performance without the jitters.
| Semax | Selank | |
|---|---|---|
| Class | Synthetic ACTH(4-10) analog | Synthetic tuftsin analog |
| Primary effect | Cognitive enhancement, neuroprotection | Anxiolytic, stress reduction |
| Key pathway | BDNF upregulation | GABA / serotonin modulation |
| Onset | 15–30 minutes | 10–15 minutes |
| Duration | BDNF elevated up to 24 hours | 3–4 hours subjective effect |
| Stimulating? | Yes — avoid evening use | No — calming without sedation |
| Administration | Intranasal | Intranasal |
| Typical dose | 200–600 mcg 2–3x daily | 200–400 mcg 2–3x daily |
| Approved where | Russia, Ukraine | Russia |
| FDA status | Not approved | Not approved |
| Cognitive effect | Focus, memory, mental stamina | Reduced anxiety, emotional stability |
| Best for | Productivity, learning, recovery | Anxiety, stress, social situations |
Choose Semax When
You need cognitive enhancement — sharper focus, better memory, faster learning. Before deep work sessions, studying, or creative work. Semax is stimulating, so use it morning and afternoon. Avoid evening dosing or it may interfere with sleep.
Choose Selank When
You're dealing with anxiety, stress, or need emotional regulation without sedation. Selank calms without making you drowsy — it's not a benzodiazepine. Good for social anxiety, high-pressure situations, or as a daily anxiolytic. Can be used any time of day.
Use Both Together
This is the classic Russian nootropic stack. Semax in the morning and afternoon for cognition, Selank throughout the day for anxiety management. The combination produces a state of alert, focused calm that users describe as "productive without stress." Both are intranasal and can be administered back-to-back.