Prelox contains pine bark extract and arginine, an amino acid

Dr. Frank Schonlau, who works for the London-based supplement maker Horphag Research UK says the supplement pill, Prelox, containing pine bark extract and the amino acid L-arginine aspartate continues to work over time. Studies lasting up to six weeks have shown it improves erectile function in men with mild to moderate erectile problems. Dr. Frank Schonlau assigned 124 men 30 to 50 years old to take two tablets of Prelox twice daily, or an inactive placebo, for six months. Most of the men's erectile problems were likely related to mild, untreated hypertension (high blood pressure. Men in both groups had moderately high blood pressure and "borderline high" total cholesterol levels. They were instructed to lose weight, cut down on their salt intake, and exercise, in addition to taking the supplement or placebo pills. Men in both groups scored an average of 15 on a 30-point standardized score measuring erectile function, corresponding to mild to moderate erectile dysfunction. At three months, average scores were 25 for the Prelox group (a 25-30 point score signifies no dysfunction) and 19 in the placebo group (19-24 indicates mild dysfunction); at six months, average scores were 27 for the Prelox group and 19 for the placebo group. The men in the Prelox group also showed significantly greater improvements in other aspects of sexual function compared to men in the placebo group, including orgasmic function, sexual desire, intercourse satisfaction, and overall satisfaction. Prelox works by restoring the ability of the blood vessels to produce nitric oxide, which triggers blood vessel dilation. BJU International, 2010.