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    Huperzine A

    Also known as: Huperzia serrata extract, Hup-A

    Sesquiterpene alkaloid; reversible AChE inhibitor that increases synaptic acetylcholine; also has NMDA-antagonist and neuroprotective properties.

    Last reviewed: 2026-06-23 · 1 indexed study

    Evidence Score
    56/100
    MemoryAcetylcholine supportCognitive performance
    Data Completeness3/4 · 75%
    Evidence ScoreDosageSafetyLinked Studies

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    Overview

    Huperzine A is a potent, selective, reversible acetylcholinesterase inhibitor isolated from Chinese club moss, used for memory support and as a cognitive enhancer.

    Mechanism & Function

    Mechanism of Action

    Prolongs synaptic acetylcholine availability, supporting memory encoding and cognitive performance.

    Physiological Role

    Used in nootropic and pre-workout formulas for mind-muscle connection and cognitive sharpness; cycling is recommended due to long half-life.

    Primary Pathways

    AChE inhibitionNMDA receptor modulationAntioxidantNeuroprotection

    Performance / Health Relevance

    RCTs in Alzheimer's show mild cognitive benefit; healthy-user data more limited.

    Evidence Review

    Overall56/100
    Human Clinical60/100
    Meta-Analysis50/100
    Mechanistic85/100
    Real-World55/100
    Safety70/100

    Practical Use & Dosage

    Minimum Effective Dose
    50 mcg
    Optimal Range
    100–200 mcg/day
    Upper / Caution Level
    ~400 mcg/day short-term
    Timing
    Morning; cycle 5 days on / 2 off
    Best Format
    Capsule
    Bioavailability
    High — crosses blood-brain barrier readily.
    Absorption Considerations
    Rapid absorption; long half-life (~12 h).

    Safety & Interactions

    Side Effects

    • •Nausea
    • •Sweating
    • •Bradycardia
    • •Insomnia if late dosing

    Contraindications

    • Bradyarrhythmia
    • Asthma
    • Epilepsy
    • Pregnancy

    Drug Interactions

    • •Cholinesterase inhibitors
    • •Anticholinergics
    • •Beta-blockers

    Who Should Avoid

    • •Cardiac conduction abnormalities
    • •Active asthma

    Monitoring

    HR in sensitive users.

    Frequently Asked Questions

    Auto-generated from indexed evidence — dosage, safety, interactions, and more.

    When is Huperzine A typically used or indicated?

    Huperzine A is most commonly used for: Memory, Acetylcholine support, Cognitive performance. Used in nootropic and pre-workout formulas for mind-muscle connection and cognitive sharpness; cycling is recommended due to long half-life.

    How does Huperzine A work?

    Prolongs synaptic acetylcholine availability, supporting memory encoding and cognitive performance.

    What is the recommended dose of Huperzine A?

    The optimal range is 100–200 mcg/day. with a minimum effective dose of 50 mcg. Best taken: Morning; cycle 5 days on / 2 off. Upper / caution level: ~400 mcg/day short-term.

    What are the side effects of Huperzine A?

    Reported side effects include: Nausea; Sweating; Bradycardia; and Insomnia if late dosing. Monitoring: HR in sensitive users.

    Does Huperzine A interact with medications?

    Known or theoretical interactions: Cholinesterase inhibitors; Anticholinergics; and Beta-blockers. Always check with a clinician before combining with prescription medication.

    Who should avoid Huperzine A?

    Huperzine A is generally not recommended for: Cardiac conduction abnormalities; Active asthma; Bradyarrhythmia; Asthma; Epilepsy; and Pregnancy.

    How strong is the evidence for Huperzine A?

    Evidence level: Moderate (overall score 56/100), based on 1 indexed study on SuppIndex.

    Research & References (1)

    Huperzine A for Alzheimer's disease: meta-analysis

    Meta-Analysis2013Moderate
    PubMed

    Significant cognitive improvement in mild-to-moderate Alzheimer's vs placebo.

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    Research Overview

    Moderate Evidence
    1Total Studies
    0Human Trials
    1Meta-Analyses
    2013Latest Study
    0Animal / In Vitro
    0Athlete Studies
    Primary data sourceClinical Patients
    Pooled evidence (meta-analysis / systematic review)Yes

    Cite this ingredient

    One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.

    Stable URL

    https://thesuppindex.com/ingredients/huperzine-a

    SuppIndex. (2026). Huperzine A: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/huperzine-a

    Based on 1 indexed studies · Evidence level: Moderate.

    Goal Ratings

    Focus
    Cognition

    Stack Compatibility

    Pair with Alpha-GPC for choline substrate; cycle to avoid tolerance.

    Alpha-GPCBacopa MonnieriLion's Mane