Nature Made Extra Strength Vitamin C 1000 mg are Vitamin C supplements verified by USP. These Vitamin C immune support tablets provide antioxidant support, help support a healthy upper respiratory tract, and aid in iron absorption. Vitamin C is also needed for collagen synthesis to support skin health. Sourced from high-quality ingredients, adult Vitamin C tablets have no artificial flavors, no color added, no added preservatives, and are gluten free. These tablets are ideal for busy professionals, parents, and active adults who don't get enough Vitamin C from their diets. Adults take one Vitamin C tablet daily with water and a meal. This supplement provides 1000 mg Vitamin C per tablet to support your immune health. USP has tested and verified ingredients, potency, and manufacturing process. USP sets official standards for dietary supplements. Visit the USP verified website for more information. *Based on a survey of pharmacists who recommend branded vitamins and supplements. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.