Schisandra is originated from China and there are two kinds of Schisandra widely used. they are Schisandra Chinensis (Turcz.) Baill and Schisandra Sphenanthera Rehd. et Wils. the lignans take a large percentage in Schisandra extract. the lignans includes schisandrol, cchizandrin, aomisin A, aeoxyschizandrin, r-schizandrin, pseudo-r-schizandrin, aomisin N, schisanhenol, schisantherin A etc.