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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.
L-Arginine is an amino acid found in red meat and other protein sources. The body uses this amino acid to make a substance called nitric oxide (NO) that dilates blood vessels to improve blood circulation. This is believed to be how L-arginine can help increase blood flow to the penis, allowing a firmer erection. In one study, it seemed as though using a low dose of L-arginine (500 mg three times a day) was no better than taking a placebo (sugar pill). However, this dose was effective in men with low levels of NO.