Solgars Ester-C is absorbed approximately four times more, activated twice as fast, and remains in circulation twice as long as regular vitamin C. Solgar Vitamin C Ester-C 500mg: It is an innovative non-acidic form of vitamin C with incorporated: citric bioflavonoid complex, acerola, rosehip berries, rutin and the naturally occurring metabolites of vitamin C: L-threonic, L-lyxonic and L-xylonic acid. It has the same benefits as vitamin C, but is offered in a non-acidic form. Contributes to the smooth and effective functioning of the immune system Promotes collagen formation and proper blood vessel function, enhancing skin and gum health Contributes to the smooth functioning of the nervous system Provides protection to cells against oxidative stress Increases iron absorption Contributes to the recycling of vitamin E and offers antioxidant action Helps reduce fatigue