Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Ginkgo Biloba | Huperzine A | |
|---|---|---|
| Category | Nootropics | Nootropics |
| Standard Dose | 120-240 mg/day of standardized extract (24% flavone glycosides, 6% terpene lactones) divided into 2-3 doses | 50-200 mcg twice daily |
| Timing | With or without food. Split into 2-3 doses throughout the day. Effects may take 4-6 weeks to manifest. | Morning and early afternoon. With or without food. |
| Cycle Duration | Ongoing; no cycling required. Clinical trials typically run 22-26 weeks. | Cycle 2-4 weeks on, 1-2 weeks off to prevent AChE downregulation |
| Evidence Level | strong_human | strong_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.
Potent, selective, and reversible inhibitor of acetylcholinesterase (AChE), derived from the club moss Huperzia serrata. Exhibits preference for the tetrameric G4 form of AChE predominant in the mammalian brain. Eight-fold more potent than donepezil and two-fold more potent than rivastigmine at AChE inhibition. Crosses the BBB efficiently. Also antagonizes NMDA receptors at high concentrations and provides neuroprotection via attenuation of oxidative stress, regulation of apoptotic proteins (Bcl-2, Bax, P53, caspase-3), and upregulation of NGF.
50-200 mcg twice daily
Morning and early afternoon. With or without food.
Cycle 2-4 weeks on, 1-2 weeks off to prevent AChE downregulation
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