L-arginine is an amino acid naturally found in meat and in your body. It helps make nitric oxide (NO), which helps blood vessels relax and expand. If you lack NO, your blood vessels become hard and narrow. But the more you get, the more your blood vessels expand.
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Because l-arginine acts as a nutrient, you can take it without fear of dangerous side effects. And one study in particular showed an 80 percent improvement in erectile function for men who took 2.8 grams of l-arginine for two weeks.
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You'll get l-arginine by eating red meat, fish, and chicken. But for more noticeable results, you can take it in supplement form. Start with a 500 mg capsule every day. If you don't like to swallow pills, a powdered form is also widely available.
