L-Cysteine is a non-essential amino acid (biosynthesized in humans) which serves an important structural role in many proteins. It is closely related to Cystine which is formed by two molecules of L-Cysteine. Cysteine contains sulfur and is also used to manufacture L-Glutathione and L-Taurine. It is important in detoxification and can even protect the body from damage caused by radiation. L-Cysteine is used in producing antioxidants and protects the brain and liver from alcohol, drugs and cigarette smoke damage. It is important for the repair of hair and nail tissue. Other benefits include healing of severe burns, formation of skin, building muscles and reducing the effects of aging. Although classified as a non-essential amino acid, in rare cases, Cysteine may be essential for individuals with metabolic diseases, infants or the elderly if a sufficient quantity of methionine is not available in the body. You can find Cysteine in many foods - chicken, pork, turkey, duck, eggs, milk, broccoli, garlic, onion, red peppers, wheat germ and oats. L-Cysteine enhances immune system function and promotes the activity of white blood cells. It is also used in treating angina, bronchitis and acute respiratory distress. During a hypoglycemia attack (too much insulin in the blood causing an unsafe drop in blood sugar) Cysteine can be used to inactivate insulin, allowing blood sugar levels to normalize. L-Cysteine supplements are recommended for bodybuilders and athletes due to the regular physical stress which weakens their immune systems. Cysteine can prevent the breakdown of muscle tissue and enhance sport endurance because it produces energy by converting to glucose. Bodybuilders can benefit form its effectiveness in building lean muscle tissue and fat burning.
Diabetics should avoid supplements that contain Cysteine because high levels of Cysteine can inactivate insulin.
