Although several substances in damiana leaves have been chemically identified by Mexican and German scientists, no one knows which one is responsible for the aphrodisiac effect.
狄亞茲說，曾有墨西哥和德國的科學家分析出大迷亞納葉中數種可確定的化學成分，但到底哪一種最具壯陽效果，目前還不知道。