What is glutathione and why must we protect patient access to it? Human Glutathione S transferase omega 1 GSTO1 Recombinant Protein Immunocal: Clinically Proven Glutathione Boost I Immunotec Immunotec L Glutathione vs. oxidized vs. Reduced Glutathione 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