Calcium Ascorbate is not acidic and will not contribute to excess stomach acidity or irritation in sensitive persons. Calcium Ascorbates is synthesized from a combination of Ascorbic Acid and Calcium Carbonate to form Calcium Ascorbate C-1000.
From the FDA's website: "Some scientific evidence suggests that consumption of antioxidant vitamins may reduce the risk of certain forms of Long standing problems. However, FDA has determined that this evidence is limited and not conclusive."