Dog Safe Snacks: What Foods Are Rich in Glutathione? Earth Buddy Pet Glutathione facts: 1. Glutathione is an important antioxidant in the body that helps protect cells from damage caused by free radicals. It is found in almost every cell and is composed of Glutathione is an antioxidant powerhouse that plays a crucial role in detoxifying our bodies and boosting immune function. If you're looking to enhance your glutathione levels, incorporating these glutathione rich foods into Sulfur rich foods support glutathione,an intracellular antioxidant that helps cells detoxify. #plantbased