Ester-C Maximum Strength delivers 1000 mg of patented immune support in a single daily dose. Clinically studied to remain active in white blood cells for up to 24 hours—longer than standard vitamin C—this formula provides sustained antioxidant protection. Unlike regular vitamin C, Ester-C is non-acidic and gentle on the stomach. Each vegetarian tablet contains naturally occurring metabolites that enhance retention and absorption. Free from gluten, dairy, soy, artificial additives, and GMOs. One tablet daily supports your immune system around the clock.