ending out spores instead of seeds. They thrive in damp, shaded areas such as tropical woodlands and the edges of swamps. Huperzine A and huperzine B are two of the chemicals that have been separated from Chinese club moss. Huperzine B is also an acetylcholinesterase inhibitor, but because its effects are much weaker than those of huperzine A, most research has focused on huperzine A. Synthetic forms of huperzine A have been made in chemical laboratories and they appear to be as effective as nat