GSTM1: GST Enzymes and Glutathione for Environmental Toxins Dr. As we age, our cells can become more stressed; the production of Glutathione (GSH) decreases and can even stop. As cells are subjected to oxidative stress, the production process can't Integrative Modeling of Oxidative Stress and C1 Metabolism Reveals Upregulation of Formaldehyde and Downregulation of Glutathione 2 Minute Neuroscience: Melatonin (drug supplement) Acetyl Glutathione 300 mg