Horse chestnut oil is traditionally used for the health of the leg veins. According to a study conducted in West Germany in 1980, horse chestnut oil managed to turn a varicose vein condition into a perfectly healthy and normal vein. Horse chestnut oil stimulates and protects blood vessels and relieves swelling associated with poor venous circulation. It also reduces fluid retention by increasing capillary permeability and allowing the reabsorption of excess fluid back into the circulatory system. Promotes good blood circulation to and from the heart. Prevents swelling. Its antioxidant action protects collagen and elastin (the two main proteins that make up the structure of the veins). By protecting these two basic proteins, veins and capillaries remain strong and maintain their structural integrity.