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Botanical

Huperzine A

Huperzine A is an alkaloid from Chinese club moss (Huperzia serrata) that blocks an enzyme which breaks down the nerve messenger acetylcholine.

Also listed as Qian Ceng Ta, Huperzine A Leaf Extract

Cognition

What it is studied for

The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.

MemoryCognitionModerateA3 studies
Focus And AttentionCognitionModerateBNo linked study
Brain FogCognitionModerateBNo linked study
Mental SpeedCognitionModerateBNo linked study
Every rating with its studiesGrouped by health goal, with the publications behind each rating

Why is huperzine A studied for memory?

Huperzine A is an alkaloid from Huperzia serrata. It inhibits acetylcholinesterase, the enzyme that breaks down the nerve messenger acetylcholine. This is a pharmacological action, not evidence by itself that a supplement improves everyday concentration. 1

Key studies

The most recent publications linked to Huperzine A's ratings.

Huperzine A in the Treatment of Alzheimer's Disease and Vascular Dementia: A Meta-Analysis2014Huperzine A for Alzheimer’s Disease: A Systematic Review and Meta-Analysis of Randomized Clinical Trials2013Efficacy of tablet huperzine-A on memory, cognition, and behavior in Alzheimer's disease.1995

Why people take it

Cognition25.1%
Energy24.1%
Fitness15.4%
Stress & Mood11%
Essential Health9.7%
Weight Management5.6%

SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.

Questions people ask

Is it proven to improve focus in healthy adults?

The review discussed here studied Alzheimer’s disease, so it cannot establish that use. 2

Does a natural origin mean it is mild?

No. Huperzine A inhibits an enzyme involved in nerve signaling and can cause adverse effects. 1

Is Huperzia serrata recommended in pregnancy?

No. RIVM specifically advises against these preparations, particularly during pregnancy. 3

Sources

  1. Huperzia serrata Memorial Sloan Kettering Cancer Center