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Huperzine A is one of the alkaloids contained in a plant known as Chinese club moss. Other types of club moss are common in the United States, but true Chinese club moss is very hard to find on the U.S. market. It can be grown in Hawaii, but not in any other part of this country. Believed to be largely unchanged from prehistoric plants, club mosses are small ground covers that do not produce flowers. Related to the fern family of plants, they spread by s