L-Cysteine is an amino acid found in most high protein foods. It has a role in maintaining the immune system and also acts as an antioxidant for protection of the liver, lungs and brain. The ability of L-Cysteine is to promote metabolism of fats and production of muscle tissue; this may aid in weight control and a lean, toned body. The addition of Vitamin B6 enhances metabolism, and helps speed up absorption and assimilation of L-Cysteine in the body. This makes it one of the most effective ways of taking HealthAid L-Cysteine.