L-Arginine Powder in Mixed Berry Flavor is a convenient and tasty way to supplement your diet with this amino acid. L-Arginine is involved in the production of nitric oxide, which helps to relax blood vessels and support healthy blood flow. This powder is easily mixed into your favorite beverage or smoothie for a quick and easy boost of L-Arginine. Just mix 1 scoop with 8-12 oz of water 1x a day, 30 minutes before your workout!