The practice of stimulating follicular development by Shen-invigorating herbs is directed by traditional Chinese medical theories of "the Shen stores essence of
Xing ren (Semen Armenlacae Amarum, 杏仁) and Tao ren (Semen Persicae, 桃仁)Both are seeds of fruits in Rosaceae. Both contain oils, amygdalin and emullsin.