l cysteine as a substrate for glutathione (GSH) synthesis as well as a Download Scientific Diagram Dietary sulfur amino acid restriction improves glucose homeostasis through hepatic de novo serine synthesis bioRxiv Potential Role of Sulfur Containing Antioxidant Systems in Highly Oxidative Environments If you have a sulfur sensitivity, glutathione can be problematic. Glutathione is primarily made up of sulfur, which can cause issues for those with a sulfur sensitivity. While Glutathione is an Frontiers Glutathione and proline can coordinately make plants withstand the joint attack of metal(loid) and salinity stresses