This form of protein has been broken down by exposing it to heat, acid, or enzymes that break apart the bonds linking the amino acids, making it the purest form of whey protein. Whey hydrolyzed protein contains no lactose, no carbs, and no fats. The evidence that L-arginine supplements actually increase muscle mass is not convincing. Research indicates that supplementing with specific amino acids, including arginine, does not increase muscle mass any more than training alone. Supplementation in the study also had no effect on muscle strength. By reducing the fat stores underneath the skin and promoting muscle growth, it has been proven that L-arginine can increase fitness performance and improve strength - leading to increased muscle mass. The majority of whey protein supplements are artificially sweetened with sucralose and acesulfame potassium. Although the use of these sweeteners is widespread, their safety as food additives remain controversial.