Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Huperzine A | Lion's Mane (Hericium erinaceus) | |
|---|---|---|
| Category | Nootropics | Nootropics |
| Standard Dose | 50-200 mcg twice daily | 500-3000 mg/day of fruiting body extract (standardized to >30% polysaccharides) or 1000-3000 mg/day of mycelium extract (erinacine-enriched) |
| Timing | Morning and early afternoon. With or without food. | Morning or split morning/afternoon. With or without food. Effects are cumulative — expect 2-4 weeks before noticeable cognitive benefit. |
| Cycle Duration | Cycle 2-4 weeks on, 1-2 weeks off to prevent AChE downregulation | Ongoing; no cycling strictly required, though some users cycle 8 weeks on, 2 weeks off |
| Evidence Level | strong_human | moderate_human |
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
Contains hericenones (fruiting body) and erinacines (mycelium) that stimulate nerve growth factor (NGF) synthesis in glial cells via activation of the JNK pathway. Erinacines cross the blood-brain barrier via passive diffusion and act as potent neurotrophin-stimulating compounds, activating the TrkA receptor and downstream ERK1/2 signaling cascades to promote hippocampal neurogenesis and synaptic plasticity. Also demonstrates anti-inflammatory activity through suppression of NF-kB and upregulation of BDNF expression.
500-3000 mg/day of fruiting body extract (standardized to >30% polysaccharides) or 1000-3000 mg/day of mycelium extract (erinacine-enriched)
Morning or split morning/afternoon. With or without food. Effects are cumulative — expect 2-4 weeks before noticeable cognitive benefit.
Ongoing; no cycling strictly required, though some users cycle 8 weeks on, 2 weeks off
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