Horny Goat Weed Is An Ornamental Plant That Also Has A Long History Of Traditional Use In Chinese Herbalism. In China, Horny Goat Weed Is Called Yin Yang Huo Because It Is A Tonic For The Female (Yin) And The Male (Yang). Epimedium Was Thought To "Tonify Life's Gate" - A Term Used To Refer To The "Vital Energy" In Men. Now® Horny Goat Weed Extract Is Combined With Maca, Another Herb Known For Its Tonifying Properties.*