Fast C and bio quercetin phytosome formula maximizes the absorption and health benefits of vitamin C. It also contains calcium and magnesium to neutralize acid, protecting sensitive stomachs. Vitamin C supports immune system as well as whole body health. In fact, research indicates that people with higher Vitamin C levels are more likely to live longer, healthier lives. Quercetin has a long traditIngredients: Supplement Facts Serving Size: 1 Vegetarian Tablet Amount Per Serving Vitamin C (as ascorbic acid) 500mg Calcium (as calcium carbonate) 79mg Magnesium (as magnesium hydroxide) 8mg Bioperine piperine [from black pepper extract (fruit)] 3mg Bio-Quercetin phytosome(providing 5 mg quercetin [from Japanese sophora concentrate (flower bud)], phosphatidylcholine complex [from sunflower]) 15mg Other Ingredients: Mmicrocrystalline cellulose, stearic acid, maltodextrin, croscarmellose sodium, vegetable stearate, silica, coating (hydroxypropyl methylcellulose, glycerin).