Huperzine A, is a naturally occurring sesquiterpene compound found in the plant .
Huperzine A is an Acetylcholinesterase inhibitor similar to other compounds , , and .
In the US Huperzine A is sold as a dietary supplement for memory support. The botanical has been used in China for centuries for the treatment of swelling, fever and blood disorders. Clinical trials in China has shown it to be effective in the treatment of Alzheimer's disease, and has been shown to enhance memory in healthy young students in one study