Vitamin C is perhaps the most popular vitamin known to man. It is consumed in a supplemental form by millions of people across the world for its antioxidant properties, which are well-documented in medical research. Calcium ascorbate is an optimal nutritional supplement that combines ascorbic acid (vitamin C) with calcium carbonate. By combining these two dietary ingredients, we have created a buffered source of vitamin C that will not contribute to gastric irritation in sensitive persons.