Glencee DZ The IMMUNE BOOSTER TRIO Powered by Vitamin C 1000mg Vitamin D3 1000iu Zinc Sulphate 15mg Effervescent Tablet 1. Vitamin C is a potent antioxidant necessary for the immune system to mount and sustain an adequate response against pathogens. 2. Vitamin D3 helps to activate immune cell function to boost both adaptive & innate immunity. 3. Zinc has Immunomodulatory and antiviral activities.