Understand the source comparison
Comparative Peptide Performance: Specificity vs Breadth of Effect
Semax BDNF/NGF upregulation 2–4 hours (acute); 7–10 days (peak) Working memory, verbal fluency, pattern recognition Intranasal spray Most reproducible human data. Russian trials show 15–25% improvement on attention tasks. Requires consistent twice-daily dosing
No winner is assigned.
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- Semax
- BDNF/NGF upregulation
- 2–4 hours (acute); 7–10 days (peak)
- Working memory, verbal fluency, pattern recognition
- Intranasal spray
- Most reproducible human data. Russian trials show 15–25% improvement on attention tasks. Requires consistent twice-daily dosing.
- Selank
- GABAergic modulation, enkephalin binding
- 3–5 days (anxiolytic); 7–10 days (cognitive)
- Sustained attention, executive function under stress
- Best suited for anxiety-driven cognitive deficits. Does not enhance baseline performance in low-stress individuals.
- Dihexa
- HGF receptor agonism
- 48–72 hours (animal models)
- Memory consolidation, spatial learning, neurogenesis
- Oral (investigational)
- Highest potency of any known cognitive agent. 10,000× BDNF. Human safety data pending. Not commercially available.
- MOTS-c
- Mitochondrial-derived peptide, AMPK activation
- 4–6 hours (metabolic); 14+ days (cognitive)
- Mental fatigue resistance, processing speed under metabolic stress
- Subcutaneous injection
- Indirect cognitive benefit through enhanced neuronal energy metabolism. Most relevant for age-related decline.
- P21
- CREB pathway modulation
- 7–14 days
- Long-term potentiation, memory retention
- Intranasal or subcutaneous
- Derived from CNTF. Promotes synaptic strengthening. Limited human data; most evidence from rodent models.