Description:N -acetyl-l-cysteine (NAC) is an aminoacid and antioxidant. It is a precursor in the body to the critical antioxidant glutathione which is produced intracellularly primarily by the liver.The Inside Scoop:Precursor to GlutathioneIngredient Details:N-Acetyl-L-Cysteine 500 mg Cellulose magnesium stearate and silicon dioxide. Capsule consists of gelatin. Contains NO common allergen. Store in a cool dry place or at room temperature and away from light.Suggested Use:Take 1 to 4 capsules per day or asdirected by your qualified health consultant.