Doctor's Best vein support contains DiosVein, used for decades for vascular support in Europe. Derived from Sweet orange and rich in Bioflavonoids, DiosVein has been shown in clinical studies to support blood vessel health and promote normal circulatory function.* further studies have found that Diosmin in combination with the flavonoid hesperidin supports healthy venous function.* Doctor's Best vein support also features Menaq7, a long-acting, natural form of vitamin K2 found in the traditional Japanese fermented food, natto. Adequate K2 is important for healthy blood vessel function and Menaq7 is a long-acting form shown to support cardiovascular health.*