C-1000, Corn-Free Non-GMO For Immune Support Source Naturals Non-GMO C-1000 is sourced from tapioca, a non-GMO, corn-free source of vitamin C. Most vitamin C is sourced from genetically modified corn, which is of concern to some people. Source Naturals Non-GMO C-1000 provides all of vitamin C’s health benefits, including support for the immune system, collagen formation, hormone production, and iron utilization.* 1000 mg Tablet Option Available: 60, 120, 240 Suggested Use: 1 tablet daily, preferably with a meal. Allergies: Suitable for vegetarians, vegans and hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, preservatives or artificial color, flavor, or fragrance.