Product: SYNVIT : Vitamin C 1000mg Rosehip 20mg Citrus Bioflavonoids 20mg. Vitamin C 1000mg 30 Tablets. Ascorbic Acid 1041mg providing Vitamin C 1000mg 1250%. Citrus Bioflavonoids 20mg -. Vitamin C also contributes to the normal function of the immune system and supports immune function during and after intense physical activity.