Vitamin C is vitally important for overall health but the human body cant make it, so you have to get vitamin C through diet or supplements. In fact, some studies have shown that vitamin C supplementation supports certain aspects of cardiovascular health. Plus, vitamin C biological activity is complemented by the health benefits of the flavonoid quercetin. In fact, vitamin C and bioflavonoids areIngredients: Supplement Facts Serving Size: 1 Vegetarian Tablet Amount Per Serving Vitamin C (as ascorbic acid) 1000 mg Bio-Quercetin phytosome (providing 5 mg quercetin [from Japanese sophora concentrate (flower bud)], phosphatidylcholine complex [from sunflower]) 15 mg Other Ingredients: Microcrystalline cellulose, stearic acid, croscarmellose sodium, vegetable stearate, silica, coating (hydroxypropyl methylcellulose, glycerin).