Seasonal Support Formula 1000 mg Vitamin C Antioxidant Protection 15 mg Zinc A Dietary Supplement Vegetarian/Vegan Non-GMO Family Owned and Operated Since 1977! C-1000 & Zinc Immune combines vitamin C with zinc for powerful immune system support. This product utilizes TRAACS? Zinc Bisglycinate, a form of zinc that has been shown in clinical studies to have superior bioavailability compared to other forms of supplemental zinc.