It is the basis of an ancient African remedy that in the 1960s was patented by a Frenchman as pygeum. Nobody has identified the active compound, so chemists can't synthesise it. The trees take 15 years to regrow. P. africana is one of thousands of plants whose roots, leaves, bark, latex or fruit are harvested for traditional and herbal medicines. Some remedies have become worldwide brands such as ginseng.
Asian ginseng is one of the newcomers to the list.
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