Product DescriptionSupport your immune health all year long with Ester-C Vitamin C, a superior form of Vitamin C.(1) Ester-C 24 Hour Vitamin C Supplement Tablets for Immune Support offer a unique formula that stays in your system for up to 24 hours, so you have around-the-clock immune support.(1) The metabolites in Ester-C help enhance the retention of Vitamin C in your white blood cells, which are a vital component of your immune system.(1) These vitamin supplements are non-GMO, and Ester-C Vitamin C tablets are manufactured without chemicals to neutralize pH, which makes them non-acidic and gentle on your stomach. Incorporate this antioxidant vitamin supplement into your daily routine to give your immune system the support it needs.(1) Ester-C is the kind of support you can count on 24/7! (1)These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. (2)The Vitamin C in Ester-C has been clinically studied to stay in the white blood cells for up to 24 hours, which is longer than regular Vitamin C. White blood cells are an important component of the immune system.Amazon.comEster-C, The Better Vitamin C, is a unique form of vitamin C that\'s absorbed into your system and is well retained -- providing advanced, active immune system support.*What is Ester-C?Ester-C 500mg Ester-C is gentle on the stomach and can be taken any time of year to promote heart, joint, antioxidant, skin, hair, and nail health*Ester-C is the 1 pharmacist recommended brand Ester-C calcium ascorbate is a unique and patented form of vitamin C. It is made using a proprietary, water-based manufacturing process which results in a pH neutral product that contains naturally occurring vitamin C metabolites. These metabolites activate the vitamin C molecules, making it easier for the body to transport them from cell to cell for numerous health benefits.*The Science Behind Ester-C: Immune Support*One clinical study showed that Ester-C increased vitamin C levels in the body.1 White blood cell levels of vitamin C were elevated in subjects receiving Ester-C when measured after initial dose. The presence of key metabolites such as threonate may contribute to this increased level and retention of vitamin C by the cells.Non-Acidic and Gentle On the Stomach*In one published study, individuals sensitive to acidic foods were given one gram of vitamin C as ascorbic acid or as Ester-C. Subjects reported heartburn significantly more frequent and severe after intake of ascorbic acid and subjects rated Ester-C as tolerated very good -- significantly more than ascorbic acid.2 So for anyone who has difficulty tolerating vitamin C, it\'s comforting to know that Ester-C is non-acidic and gentle on the stomach.*How Can Ester-C Help Me?The main benefit of Ester-C is its quick absorption and retention in the immune system.*What\'s in the BoxEster-C 500mg.*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.Trademark Information:Ester-C and The Better Vitamin C are registered trademarks of The Ester C Company. U.S. Patent Nos. 6,197,813 and 6,878,744.1Moyad MA, Combs MA, Vrablic AS, Velasquez J, Turner B, Bernal S. vitamin C metabolites, independent of smoking status, significantly enhance leukocyte, but not plasma ascorbate concentrations. Adv Ther. 2008 Oct; 25(10): 995-1009.2Gruenwald, J. et al. 2006. Safety and Tolerance of Ester-C compared with regular ascorbic acid. Advances in Therapy. 23(1): Jan-Feb: 171-8.Based on the results of the Pharmacy Times Survey among pharmacists who recommend a high potency vitamin C supplement, 2011.