Glutathione S Transferase Polymorphism Interactions with Smoking Status and HPV Infection in Cervical Cancer Risk: An Evidence Based Meta Analysis PLOS One 87 studies. 9,000+ children. and most parents have never heard this conversation. A meta analysis of 87 studies involving over 9,000 children found consistently lower glutathione levels and higher oxidative stress in children What is glutathione and why must we protect patient access to it? Glutathione (GSH): The Body's Master Antioxidant