Vitamin C500 + Calcium (3 in 1) provides two forms of vitamin C, Ascorbic Acid and Calcium Ascorbate.
Calcium Ascorbate is a time-release form of Vitamin C. This form allows for a continuous intake and use of Ascorbic Acid, cells being rapidly depleted from Ascorbic Acid without Calcium Ascorbate.
Thus, Ascorbic Acid from Vitamin C500 + Calcium (3 in 1) provides you with a great amount of Vitamin C at a high absorption rate.