Ginseng appears to have trivial effects on erectile function, but may improve men’s self-reported ability to have intercourse and their satisfaction with intercourse.[4] Saffron (Crocus sativus),[5] Tribulus terrestris,[6] Pycnogenol (Pinus pinaster),[7] Maca (Lepidium meyenii),[8] and Tongkat Ali (Eurycoma longifolia)[9] also appear to improve ED symptoms, though there are only a few studies to support each of these herbs.[10]
Supplementing with L-Arginine (alone or combined with L-Citrulline, Pycnogenol, ornithine, or yohimbine) improves erectile function.[11] Yohimbine, especially when combined with L-Arginine, also improves ED symptoms, but doesn’t seem to increase sexual function.[12] L-Citrulline (a precursor to L-Arginine) has also been shown in one study to improve erection hardness in men with ED.[13]