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For athletes, arginine AKG is beneficial because it helps to increase the growth of muscles and increases the dilation of blood vessels. If you exercise regularly and have more blood flowing to your muscles, your muscles will look bigger.
The main data that generated some interest in the use of arginine for erectile dysfunction came from a small double-blind trial in which 50 men with erectile dysfunction received either 5 g of L-arginine or placebo daily for six weeks (NOTE: a capsule contains 500 mg, so 10 capsules a day!).