Natural Factors L-Arginine 1000mgNatural Factors L Arginine 1000 mg is a non essential amino acid involved in protein synthesis. It may help support a modest improvement in exercise capacity in individuals with stable cardiovascular disease (CVD). As a free form amino acid, L arginine is easier for the body to absorb and use than when consumed from food. May help support a modest improvement in exercise capacity in individuals with stable cardiovascular disease (CVD) Supports protein