Sulfa Allergy: What It Is and How to Avoid It Absence of Cross Reactivity between Sulfonamide Antibiotics and Sulfonamide Nonantibiotics New England Journal of Medicine The CBS Genes and Sulfur Metabolism: What to Know Gene Food Datis 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