Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Aniracetam | Phenylpiracetam | |
|---|---|---|
| Category | Nootropics | Nootropics |
| Standard Dose | 750-1500 mg/day divided into 2-3 doses | 100-300 mg/day divided into 1-2 doses |
| Timing | With fat-containing meals (fat-soluble compound; bioavailability increases significantly with dietary fat) | Morning or early afternoon; avoid evening use due to stimulant effects. Take with or without food. |
| Cycle Duration | Cycles of 8-12 weeks on, 4 weeks off | 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 |
Potent positive allosteric modulator of AMPA receptors with 5-10x the potency of piracetam, slowing both channel closing rate and microscopic desensitization rates. Also modulates metabotropic glutamate receptors (mGluRs), activates nicotinic acetylcholine receptors, and indirectly boosts dopaminergic and serotonergic neurotransmission, conferring anxiolytic properties.
750-1500 mg/day divided into 2-3 doses
With fat-containing meals (fat-soluble compound; bioavailability increases significantly with dietary fat)
Cycles of 8-12 weeks on, 4 weeks off
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.
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