Source Naturals Ultimate Ascorbate C delivers 1,000 mg of vitamin C per tablet that is derived from 5 fully reacted mineral ascorbates. Unlike traditional ascorbic acid-based vitamin C supplements, Ascorbate C is pH neutral and gentle on the stomach. Vitamin C plays a crucial role in immune system function, collagen formation and hormone synthesis. Contains no yeast, dairy, egg, gluten, soy, wheat, sugar, salt, starch, preservatives, or artificial color, flavor or fragrance.