nutritional yeast glutathione Extracts Frontier Co-Op Gluten Free Premium

To limit potentially life-threatening depletion of intracellular antioxidant/GSH stores, epithelial cells have developed numerous compensatory pathways, including the cystine-glutamate antiporter (SLC7A11), which critically maintains de novo GSH biosynthesis by increasing intracellular cystine levels (9)

It's nice that light or air can never be added with this type of packaging, because vit C is sensitive to that

Oral use may still be considered in these situations, but only under the guidance of a qualified healthcare provider

Warning Consult your physician prior to using this product if you are pregnant, nursing, taking medication, or have a medical condition