NATURAL FACTORS - Vitamin C Calcium Ascorbate - 180 Capsule(s) - NPN: 80003521 -- pH neutral Highly bioavailable and lasts longer in cells Enhances immune system Promotes wound repair Builds strong, healthy bones and teeth Powerful antioxidant Improves circulation and the appearance of varicose veins Gentle on the stomach Recommended for individuals who typically experience gastrointestinal symptoms when taking vitamin C, Natural Factors Vitamin C Calcium Ascorbate is buffered with calcium so it is gentle on the stomach.