Chinese Club Moss

BotanicalBest with a meal

What is it

Chinese club moss (Huperzia serrata) is the source plant of huperzine A, a reversible acetylcholinesterase inhibitor used as a cognitive supplement and studied as a pharmaceutical for Alzheimer disease.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Cognitive function in Alzheimer disease

Good Evidence

Chinese trials of huperzine A show modest cognitive improvements in mild-to-moderate Alzheimer disease, with effects comparable to early cholinesterase inhibitors.

How it works

Huperzine A inhibits acetylcholinesterase, raising synaptic acetylcholine levels in the brain. It also has NMDA receptor antagonist activity and shows neuroprotective effects against glutamate excitotoxicity in animal models. In China, huperzine A is approved for Alzheimer disease; in the U.S. it is sold as a supplement at micrograms per dose.

Dosage

No RDA. Cognitive use: 50-200 mcg of huperzine A twice daily. Higher doses (400 mcg) have been used in dementia trials.

When and how to take it

WHEN: Morning with food. HOW: Start with the lowest dose to assess tolerance; cycle off periodically.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Huperzine A extract

Standardized to micrograms of huperzine A.

Well absorbed orally; crosses blood-brain barrier.

Safety

Acetylcholinesterase inhibition causes cholinergic side effects: nausea, sweating, salivation, slow heart rate, and GI cramping. Insomnia and headache are also reported.

Who should be cautious

Avoid in pregnancy. Caution in cardiac conduction disorders, asthma, COPD, peptic ulcer disease, urinary obstruction, and seizure disorders.

Interactions

Additive with cholinergic drugs (pyridostigmine, donepezil) and anticholinergic drugs (antagonism). Caution with beta-blockers (additive bradycardia).

Frequently asked questions

Is huperzine A safe long-term?⌄

Chinese clinical use suggests reasonable tolerability; long-term U.S. supplement use is less characterized. Cycling and clinician guidance are reasonable.

References

Chinese Club Moss on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Chinese Club Moss (PubMed search) — PubMed link

Track Chinese Club Moss with Pilora

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.