Schisandra, wu wei zi extract also known as wu-wei-wi and sometimes spelled with a "z" (Schizandra) has a long history of use in ancient Chinese medicine as an herb capable of promoting general well-being and enhancing vitality. In addition to its traditional uses for promoting energy and alleviating exhaustion caused by stress, schisandra has historically been taken to strengthen the sex organs, to promote mental function, to beautify the skin and to treat night sweats, asthma, tough, and insomnia.