L Glutathione vs. oxidized vs. Reduced Glutathione Science Time Glutathione Glutathione is a tri peptide, a small protein consisting of three amino acids, that functions as a principle antioxidant, scavenging free radicals and toxins that would otherwise damage and Glutathione is a small protein made of three amino acids. It is often called the master antioxidant because it helps regenerate other antioxidants like vitamin C and vitamin E. Key Benefits 786 993