Huperzine A, Huperzia serrata

Huperzine A is a naturally occurring sesquiterpene alkaloid compound found in the firmoss Huperzia serrata[2] and in varying quantities in other food Huperzia species, including H. elmeri, H. carinat, and H. aqualupian.[3] Huperzine A has been investigated as a treatment for neurological conditions such as Alzheimer's disease, but a meta-analysis of those studies concluded that they were of poor methodological quality and the findings should be interpreted wi... [wikipedia]