L-Glutathione is a tripeptide consisting of the amino acids glutamic acid, cysteine, and glycine. It is produced naturally in the body and plays a role in antioxidant defense, detoxification, and cell proliferation. Glutathione levels are often used as a measure of oxidative stress, and supplementation with L-glutathione has been shown to be beneficial in various conditions such as cancer, Parkinson’s disease, and autism.