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It is a well-known, powerful sexual tonic, when used up regularly; moreover, it improves  spermatozoona production in men and fertility in women. The crawlgrass is an haematic tonic, very well-known in China: in fact, it is thought that the crawlgrass purifies blood and improves energies. It also feeds hair and teeth.
In fact, in Chinese language this plant's name means "mister Ho got black hair", in reason of its capability tomake people look younger and keep them young.