What is glutathione? Know as the most important antioxidant in the body, glutathione is an essential antioxidant manufactured in all cells, but primarily in the liver. It is essential because it Glutathione is a natural antioxidant your body makes, and it can influence melanin production which is why its sometimes marketed for skin brightening., Oral supplements are mostly broken down in Glutathione: Body's Defender and Function Biom Probiotics Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification The Importance of Glutathione in Health and Healing Dr. Todd Maderis