Steroids are hormones that occur naturally in the body. Steroid medicines are man-made and are similar to the natural hormones made in the body. Reversing enlargement of blood vessels in the area they are applied to. They cause a narrowing of the blood vessels. Your personal data will be used https://bbs.pku.edu.cn/v2/jump-to.php?url=https://tr.wikipedia.org/wiki/Vitamin