Buffered Vitamin C contains high-purity ascorbic acid buffered with carbonates of potassium, calcium, and magnesium. Developed by Stephen A. Levine, Ph.D. Although the elaborate process of producing cassava root source vitamin C has one step that involves the use of corn-derived alcohol, this formula is generally well tolerated by corn allergic individuals. Allergy Research Group/NutriCology Inc. has pioneered the development of buffered vitamin C products, and continues to offer the purest and least allergenic vitamin C products available anywhere. In addition to its hefty content of ascorbic acid, our buffered vitamin C also supplies potassium and the macrominerals calcium and magnesium at approximately one half of the RDI per level teaspoon. Due to its generous complement of calcium (350 mg per teaspoon), supplementation with our buffered vitamin C may be desirable for individuals who do not regularly consume dairy products.