Natural Factors Horse Chestnut & Grape Seed - By combining two proven varicose vein preventatives, Natural Factors has created a truly effective synergistic formula designed to tone the walls of the veins and capillaries, limit the action of vein damaging enzymes, improve the look of smaller varicose veins and prevent new ones from forming. Natural Factors Horse Chestnut and Grape Seed is also useful in treating other circulatory problems, particularly chronic venous insufficiency, hemorrhoids and edema. It may also be useful in alleviating tired, heavy legs, experienced by those who work on their feet.