Now Glutathione 500mg Glutathione is a small peptide molecule composed of three amino acids: cysteine, glutamic acid, and glycine. It is produced by every cell of the body, with especially high levels in the liver. Glutathione is critical for healthy immune system function and is necessary for proper detoxification processes. It also plays a role in maintaining cellular health by neutralizing free radicals, as well as by maintain the activity of vitamins C and E. Milk thistle extract and alpha lipoic acid are included as complementary ingredients. Recommended Use: Take 1 capsule daily, preferably on an empty stomach, or as directed by a healthcare professional. Store in a cool, dry place after opening.