Vitamin C plays an important role in supporting immune function.* As an antioxidant, Vitamin C helps neutralize harmful free radicals in cells.* The Vitamin C in this product has been designed to be released over a prolonged period of time. For educational health tips and to join our money saving Healthy Rewards™ program, visit www.naturesbounty.com. Laboratory tested. Guaranteed quality. No artificial color, flavor or sweetener, no preservatives, no milk, no lactose, no soy, no gluten, no wheat, no yeast, no fish. Sodium free.