This derivative of the amino acid cysteine is often used as the preferred substrate for intracellular glutathione synthesis. It also assists detoxification, provides cellular antioxidant protection, and is much safer than cysteine. Directions: 1 capsule, 1 to 2 times daily or as directed by a healthcare professional. It is recommended that this product be taken with a multiple vitamin and mineral supplement. Free of the following common allergens: milk/ casein, eggs, fish, shellfish, tree nuts, peanuts, wheat, gluten, soybeans, and yeast. Contains no artificial colors, flavors, or preservatives.