BUTEA superba is one of the rarest plants in the world. German pharmacologists first researched the plant, which grows exclusively in Thailand, in 1940. Long forgotten, it was rediscovered a few years ago.
 Note: In older literature, isoflavones are often referred to as phytoandrogenes: testosterone because they have a similar chemical structure. But today we know: From a scientific point of view, isoflavones are not phytotestosterones and are metabolized differently in the male organism than testosterone. Therefore clearly distinguishable with hormones.