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.
