Glutathione is a strong antioxidant used by the body for many different purposes. It plays a large role in supporting the immune system and protecting the body from heavy metals. Glutathione also helps break down free-radicals and helps breaks down other toxins. Glutathione deficiency is thought to be associated with parkinson's disease, cystic fibrosis and the aging process. Glutathione also plays a role in skin and muscle tissue health.