Natures Aid Time Release Vitamin C 1000mg with added Citrus Bioflavonoids Vitamin C supplementaton is not advisable for people who sufer from renal stones. Vitamin C (as Ascorbic Acid), Di-Calcium Phosphate, Hydroxypropylmethylcellulose, Microcrystalline Cellulose, Citrus Bioflavonoids, Anticaking Agents (Vegetable Source Magnesium Stearate, Silicon Dioxide). Take 1 tablet per day. Swallow whole with food and a little water. 1 x Natures Aid 1000mg Vitamin C Time Release 30 Tablets.