Why Take Glutathione with Vitamin C and Other Nutrients? Water for Health 5 Nutrients to Support Autoimmune Disease DrJockers.com The Impact of Vitamin D and L Cysteine Co Supplementation on Upregulating Glutathione and Vitamin D Metabolizing Genes and in the Treatment of Circulating 25 Hydroxy Vitamin D Deficiency 1. Immune Defense at the Cellular Level Zinc and Vitamin C are foundational for immune cell signaling and response, while glutathione supports intracellular defense mechanisms. Together, they help the body stay resilient