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Huperzine-A

Huperzine-A is a cognitive enhancer that inhibits an enzyme that degrades the learning neurotransmitter, acetylcholine; due to this, a relative increase occurs. It belongs to the cholinergics class of molecules, and may be useful in fighting cognitive decline in the elderly. May need to be cycled.

Our evidence-based analysis on huperzine-a features 21 unique references to scientific papers.

Kamal Patel
Research analysis led by and reviewed by the Examine team.
Last Updated:

Summary of Huperzine-A

Primary information, health benefits, side effects, usage, and other important details

Huperzine-A is a compound extracted from the herbs of the Huperziceae family. It is known as an acetylcholinesterase inhibitor, which means that it stops an enzyme from breaking down acetylcholine which results in increases in acetylcholine.

Acetylcholine is known as the learning neurotransmitter, and is involved in muscle contraction as well. Increasing levels of acetylcholine is routinely used as a technique amongst weight-lifters and scholars.

Huperzine-A appears to be a relatively safe compound from animal studies of toxicity and studies in humans showing no side-effects at dosages routinely supplemented with. Huperzine-A is in preliminary trials for usage in fighting Alzheimer's Disease as well.

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How to Take

Recommended dosage, active amounts, other details

Supplementation of huperzine-A tends to be in the range of 50-200mcg daily, and while this can be divided into multiple dosages throughout the day it tends to be taken at a single dose. Supplementation of huperzine-A does not require food to be coingested with it and can be taken in a fasted state.

Cycling of huperzine-A tends to be used since it can remain in the body for quite some time (half-life of 10-14 hours), and although a 'cycle' of huperzine-A tends to last 2-4 weeks followed by a break the optimal cycle length is not yet known.

Things to Note

Is a Form Of

Primary Function:

Also Known As

(1R, 9S, 13E)-1-amino-13-ethylidene-11-methyl-6-azatricyclo- 7.3.1.0 2, 7 trideca-2(7), 3, 10-trien-5-on, Qian Ceng Ta (Huperzia Serrata)

Goes Well With

Caution Notice

Consult your doctor before using if you are currently taking any anticholinergic drugs, acetylcholinesterase inhibitors, or cholinergic drugs.

  • Huperzine-A appears to be water-soluble, and taking with food is not needed

  • Although its initial spike is quick, it appears to have a long half-life; the pharmacokinetic profile might change when changing dosages though.

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This page is regularly updated, to include the most recently available clinical trial evidence.

Each member of our research team is required to have no conflicts of interest, including with supplement manufacturers, food companies, and industry funders. The team includes nutrition researchers, registered dietitians, physicians, and pharmacists. We have a strict editorial process.

This page features 21 references. All factual claims are followed by specifically-applicable references. Click here to see the full set of research information and references for Huperzine-A.

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