Huperzine A （CAS No.: 102518-79-6）is an alkaloid extracted from China's unique plant Huperzia serrata leaf extract. It is a reversible inhibitor of acetylcholinesterase. It has the characteristics of high selectivity, low toxicity and long efficacy time. An ideal drug candidate for the treatment of senile dementia. Used for myasthenia gravis, senile memory decline and Alzheimer's disease, adolescent learning disabilities and memory enhancement.