Which of the following is considered to be the human body's master antioxidant?

Glutathione is considered to be the human body's master antioxidant and detoxifier. It is a tripeptide comprised of the amino acids glycine, L-glutamic, and L-cysteine. Glutathione functions as a water-soluble antioxidant, at the cellular level, and is also involved in detoxification reactions which protects your body against various dangerous substances.