L-arginine: Some evidence shows that taking high doses improves erectile dysfunction by stimulating blood vessels to open wider for improved blood flow. Side effects may include nausea, cramps and diarrhea. Don't take L-arginine with sildenafil (Viagra). Ginseng More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.