Huperzine A is a natural compound extracted from the Chinese club moss Huperzia serrata. Worldwide studies have shown that Huperzine A supports learning and memory by protecting acetylcholine, a neurotransmitter that acts as a messenger molecule in the brain. Huperzine A may be used for both short-term "brain boost" needs, such as preparing for a test, as well as more long-term needs, such as reducing the mild memory loss associated with normal aging.

Huperzine A has to be purified via crystallization and re-crystallization of its active ingredients to remove all the toxic compounds found in the Chinese club moss. Traditionally, this Chinese herb has been used for fever and inflammation. Research done on Huperzine A has demonstrated an increased alertness, focus, and cognitive function in those individuals that received Huperzine A in the experiments. An effective does of Huperzine A is 100mcg per day. Researchers do not recommend taking this herbal supplement with any other chemical or drug which may inhibit acetylcholinesterase.