What causes a man not to get a hard on?

Called the herbal Viagra, Panax ginseng (red ginseng) has solid research behind it. Researchers reviewed seven studies of red ginseng and ED in 2008. Dosages ranged from 600 to 1,000 milligrams (mg) three times daily. They concluded there was “suggestive evidence for the effectiveness of red ginseng in the treatment of erectile dysfunction.” More current research is examining how red ginseng influences ED. Ginsenosides are one element present in Panax ginseng extract that have action at the cellular level to improve erection. The action of Panax ginseng appears to be most effective for those with high lipids in their blood and metabolic syndrome. This herb is known to have anti-inflammatory action, improve lung function, and improve blood flow in other diseases — all characteristics that may reduce ED.

http://honestsupplement.com/internal-911-review/