We focus on hormones as doctors, but what I'm learning is there may be more to the picture: fertility begins at the cellular level. Every time a cell produces energy, it also Glutathione is the body's primary internal antioxidant, made using the amino acid cysteine, and it helps protect cells from oxidative stress. Beyond detoxification, research shows glutathione is involved in thyroid hormone metabolism, Glutathione an overview ScienceDirect Topics Glutathione Metabolism and Its Implications for Health ScienceDirect