Non-Acidic Vitamin C is made with Calcium Ascorbate. Calcium Ascorbate is a unique 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. Researchers concluded that Calcium Ascorbate compared with Ascorbic Acid caused significantly fewer epigastric adverse effects in participants sensitive to acidic foods and that Calcium Ascorbate is much better tolerated.