Herbal Extract Support for Leg Vein Circulation Dietary Supplement 21st Century...For a Healthier Future 100% Vegetarian Formula Guaranteed Quality - Laboratory Tested Horse Chestnut Seed Extract 21st Century Horse Chestnut Seed Extract (Aesculus hippocastanum) has been used for centuries to help support normal circulation in the legs. 21st Century offers the highest quality ingredients produced to strict standards for support of your good health.