Last verified: 17 days ago
Huperzine A
Also known as: HupA, Hup A, Huperzia serrata extract, selagine
Evidence under review. — Not yet rated
Natural AChE inhibitor from Chinese club moss. Approved in China for Alzheimer's; shows cognitive benefits in clinical trials.
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What it does
Huperzine A is a natural alkaloid extracted from the Chinese herb Huperzia serrata. It works by blocking acetylcholinesterase, the enzyme that breaks down acetylcholine — a brain chemical critical...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
0.4-0.8 mg daily based on study doses
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Found in
C4 Original Pre-Workout, Alpha BRAIN (90 ct), Noocube and 5 more
What the Science Says
Huperzine A is a natural alkaloid extracted from the Chinese herb Huperzia serrata. It works by blocking acetylcholinesterase, the enzyme that breaks down acetylcholine — a brain chemical critical for memory and learning. Clinical studies show it can improve cognition and task-switching in Alzheimer's patients after 8 weeks of treatment, and it has been officially approved in China as an Alzheimer's therapy since 1996.
What It Doesn't Do
Not proven to boost memory or focus in healthy adults. No evidence it prevents Alzheimer's disease. Not a substitute for FDA-approved dementia medications. Won't treat addiction on its own — early cocaine studies showed limited effects. Not proven safe for long-term use in supplement doses.
Evidence-Based Benefits
Improves memory and cognitive task performance in Alzheimer's disease patients after 8 weeks.
Moderate EvidenceEffective at: Not fully specified in provided studies
Supporting studies (click to view on PubMed):
Potently inhibits acetylcholinesterase, raising acetylcholine levels in the brain.
Moderate EvidenceEffective at: 0.4-0.8 mg daily
Supporting studies (click to view on PubMed):
Suppresses absence-like seizures in animal models at higher doses.
Weak EvidenceEffective at: 3.0 mg/kg in animal studies (human equivalent not established)
Supporting studies (click to view on PubMed):
May reduce some subjective effects of cocaine at 0.4 mg daily in early human trials.
Weak EvidenceEffective at: 0.4 mg daily
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Good — rapidly absorbed with demonstrated brain penetration in animal models; age affects clearance rate, with elderly subjects metabolizing it more slowly
Red Flags to Watch For
- Known side effects include nausea, dizziness, and digestive disorders — especially at higher doses
- Age significantly affects how quickly the body clears it, raising overdose risk in elderly users
- Over 1,000 supplement products contain it, but most are not clinically dosed or tested
- The plant source (Huperzia serrata) is scarce; some products may use synthetic or microbially-derived versions of uncertain purity
- Drug interactions possible with other cholinergic medications — consult a doctor before use
Products Containing Huperzine A
See how Huperzine A is used in these analyzed products:
C4 Original Pre-Workout
Alpha BRAIN (90 ct)
Supplement
Noocube
Supplement
EVLution Nutrition ENGN Pre-Workout
Supplement
KAGED Elite Pre-Workout
Supplement
Gorilla Mode Base
Supplement
Brain & Memory Power Boost
Supplement
Brain Defender
Supplement
Frequently Asked Questions
What does Huperzine A do?
Natural AChE inhibitor from Chinese club moss. Approved in China for Alzheimer's; shows cognitive benefits in clinical trials.
What is the effective dose of Huperzine A?
0.4-0.8 mg daily based on study doses
Is Huperzine A safe?
Known side effects include nausea, dizziness, and digestive disorders — especially at higher doses
What doesn't Huperzine A do?
Not proven to boost memory or focus in healthy adults.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25