Huperzine A

Acetylcholinesterase inhibitor from Huperzia serrata; potent cognitive effects but requires cycling due to accumulation.

cognitionfocusbrain

Evidence last reviewed: 04 Apr 2026

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Trade-offs & context

Known concerns, timing considerations, & interactions

Neural

Narrow therapeutic window — excess AChE inhibition causes nausea, bradycardia, and muscle cramps

Interaction

Do not combine with Alpha-GPC, CDP-Choline, or other cholinergic supplements — risk of cholinergic toxicity

Timing

Must be cycled — accumulation occurs with daily use; standard protocol is 2 weeks on / 1 week off

Dot colour: ●High concern ●Moderate ● Low / note

Biomarkers studied

Outcomes directly measured across the evidence records below

Cognitive

MemoryCognitive Function

Evidence

1 record

Memory / cognitive performance

Older adults; Alzheimer's patients; healthy students • RCTs + meta-analyses (Chinese trials)

PUBMEDModerate

Reliable improvements in memory & executive function; strong AChE inhibition; cycle to avoid tolerance.

Dose: 0 mgDuration: 4–12 weeks with cycling

Citation: Li et al. 2008 (meta); Sun et al. 1999

Cycle 2 weeks on / 1 week off. Avoid combining with other cholinergics.

Forms

Huperzine A extract

Typical dose 50–200 mcg, not mg.

Stacks containing Huperzine A

Public community stacks that include this ingredient.

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cognitiveneuroprotectionfocus

Cognitive Enhancement & Neuroprotection

by@athlete

Noopept & huperzine A are combined to enhance cognitive function & provide neuroprotection. Noopept is known for its memory-enhancing effects, while huperzine A inhibits acetylcholinesterase, increasing acetylcholine levels in the brain.

Noopept

10mg

Huperzine A

200mg

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