Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Ginkgo Biloba | Piracetam | |
|---|---|---|
| Category | Nootropics | Nootropics |
| Standard Dose | 120-240 mg/day of standardized extract (24% flavone glycosides, 6% terpene lactones) divided into 2-3 doses | 1200-4800 mg/day divided into 2-3 doses |
| Timing | With or without food. Split into 2-3 doses throughout the day. Effects may take 4-6 weeks to manifest. | With or without food; split doses morning and afternoon to maintain plasma levels |
| Cycle Duration | Ongoing; no cycling required. Clinical trials typically run 22-26 weeks. | Cycles of 8-12 weeks on, 4 weeks off; or ongoing with periodic reassessment |
| Evidence Level | strong_human | moderate_human |
Standardized extract (EGb 761) contains flavonoid glycosides (24%) and terpene lactones (6% — ginkgolides A/B/C and bilobalide) that act through multiple pathways: potent free radical scavenging and inhibition of membrane lipid peroxidation; antagonism of platelet-activating factor (PAF) via ginkgolides; enhancement of cerebral blood flow through nitric oxide-mediated vasodilation and reduced blood viscosity; and increased prefrontal dopamine and acetylcholine release via acylated flavonol glycosides. Bilobalide provides direct neuroprotection against excitotoxicity and mitochondrial dysfunction.
120-240 mg/day of standardized extract (24% flavone glycosides, 6% terpene lactones) divided into 2-3 doses
With or without food. Split into 2-3 doses throughout the day. Effects may take 4-6 weeks to manifest.
Ongoing; no cycling required. Clinical trials typically run 22-26 weeks.
Positive allosteric modulator of AMPA receptors, binding at a unique site along the dimer interface to reduce desensitization and deactivation. Inhibits N-type calcium channels at clinically relevant CNS concentrations. Enhances membrane fluidity of neuronal phospholipids and modulates neurotransmission across cholinergic and glutamatergic systems.
1200-4800 mg/day divided into 2-3 doses
With or without food; split doses morning and afternoon to maintain plasma levels
Cycles of 8-12 weeks on, 4 weeks off; or ongoing with periodic reassessment
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