Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| NSI-189 | Phenylpiracetam | |
|---|---|---|
| Category | Nootropics | Nootropics |
| Standard Dose | 40 mg once daily (for educational context — investigational compound, not approved for any indication) | 100-300 mg/day divided into 1-2 doses |
| Timing | Once daily, time of day not definitively established from clinical data. With or without food. | Morning or early afternoon; avoid evening use due to stimulant effects. Take with or without food. |
| Cycle Duration | Phase 2 trial used 12-week treatment duration. Long-term safety data unavailable. | Use sparingly — tolerance develops rapidly. Best cycled 2 weeks on, 2 weeks off, or reserved for acute-need situations. |
| Evidence Level | moderate_human | moderate_human |
Benzylpiperizine-aminopyridine compound that stimulates neurogenesis of human hippocampus-derived neural stem cells in vitro and increases hippocampal volume in vivo. Mechanism is independent of serotonin or norepinephrine reuptake inhibition — fundamentally distinct from traditional antidepressants. Activates the TrkB receptor (BDNF receptor) and downstream Akt/PI3K signaling pathways to promote synaptic plasticity, long-term potentiation, and neuronal survival. Enhances BDNF expression in hippocampal subregions critical for memory consolidation and mood regulation. Originally developed as ALTO-100 (Alto Neuroscience) for treatment-resistant depression with cognitive impairment.
40 mg once daily (for educational context — investigational compound, not approved for any indication)
Once daily, time of day not definitively established from clinical data. With or without food.
Phase 2 trial used 12-week treatment duration. Long-term safety data unavailable.
Atypical dopamine reuptake inhibitor with additional phenethylamine-like stimulatory properties. Increases the density of acetylcholine, NMDA, GABA, and dopamine receptors in the brain. The phenyl group addition to the piracetam backbone enables blood-brain barrier penetration at 20-60x greater potency than piracetam, with added psychostimulant and cold-tolerance properties.
100-300 mg/day divided into 1-2 doses
Morning or early afternoon; avoid evening use due to stimulant effects. Take with or without food.
Use sparingly — tolerance develops rapidly. Best cycled 2 weeks on, 2 weeks off, or reserved for acute-need situations.
Take our free assessment to get personalized recommendations based on your health goals, current stack, and biomarkers.
Get Your Free Protocol →or take the assessment →