Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Alpha-GPC | Ginkgo Biloba | |
|---|---|---|
| Category | Nootropics | Nootropics |
| Standard Dose | 300-600 mg/day | 120-240 mg/day of standardized extract (24% flavone glycosides, 6% terpene lactones) divided into 2-3 doses |
| Timing | Morning or pre-workout. Can be taken with or without food. Split into 1-2 doses. | With or without food. Split into 2-3 doses throughout the day. Effects may take 4-6 weeks to manifest. |
| Cycle Duration | Ongoing; no cycling required for standard doses | Ongoing; no cycling required. Clinical trials typically run 22-26 weeks. |
| Evidence Level | strong_human | strong_human |
Highly bioavailable choline source that crosses the blood-brain barrier efficiently via passive diffusion. Serves as a direct precursor for acetylcholine synthesis and phosphatidylcholine, a major structural component of neuronal membranes. Also stimulates growth hormone release via cholinergic activation of GHRH-releasing neurons in the hypothalamus. Contains ~40% choline by weight.
300-600 mg/day
Morning or pre-workout. Can be taken with or without food. Split into 1-2 doses.
Ongoing; no cycling required for standard doses
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.
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