Why GNA’s “Ultra Vitamin C + Bioflavonoids with Quercetin” is a great product to bring into your store: Our product goes beyond the normal vitamin C supplement to provide a high-absorption, buffered Calcium Ascorbate can be taken in higher doses while being easy on the stomach. Bioflavonoids are potent antioxidants on their own, but are even more powerful when combined with buffered Vitamin C, as they are in our formulation. Highly beneficial during cold & flu season, the Quercetin in our product adds antihistamine & antioxidant properties to this combination which makes GNA’s ‘Ultra C + Bioflavonoids’ superior to other vitamin c supplements on the market today. Both Quercetin and Citrus Bioflavonoids are powerful antioxidants and they work together with the buffered Vitamin C to enhance its antioxidant properties by keeping it active longer.