Ester-C is non-acidic form of vitamin C and hence gentle on the stomach. Each 650mg Ester-C tablet provides 500mg of vitamin C and is made in the UK to pharmaceutical GMP standards. Vitamin C contributes to collagen formation for the normal function of the skin, gums and the immune system. It also contributes to the reduction of tiredness and fatigue and to the protection of cells from oxidative stress. Daily intake: 1 to 3 tablets.