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Dietary SupplementSupport Peak Performance 1 000 mgL-Arginine and L-Citrulline are two amino acids bundled into a single complete supplement. L-Arginine is an important factor in muscle metabolism and a precursor for nitric oxide which promotes increased circulation by relaxing blood vessels. L-Citrulline helps the body rid itself of ammonia a by-product of exercise. This clearing enables the body to recover after a workout.