There is a common myth that vitamin K pills, creams and lotions diminish spider veins. The rumor stems from the fact that vitamin K has been long associated with blood clotting. Taken orally, vitamin K can cause blood clots, stopping the flow of blood through a vein or capillary and thereby making it disappear. This works with healthy veins as well, posing definite health risks. Although reviews are mixed on the effectiveness of vitamin K, most experts agree that applying vitamin K to the skin, will do very little to clot blood and minimize spider veins.
To help prevent spider veins, maintain average body weight. Exercise -- especially walking -- also helps circulation and contraction of the muscles. Wear flat or low-heeled shoes and don't use body shapers (updated girdles) that restrict blood circulation. Consult your doctor about support stockings; they can be helpful, but they must fit properly or the constriction will be detrimental.