The Benefits of Zinc, Glutathione, and Vitamin C: Boosting Your Immune System and Fighting Illness 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 Your immune system shouldn't only matter when you're already sick. It should be supported before, during, and after exposure. The Tri Immune Booster is one of my go to injectable blends for patients who Zinc causes acute impairment of glutathione metabolism followed by coordinated antioxidant defenses amplification in gills of brown mussels Perna perna ScienceDirect What vitamins should not be taken together?