Hormonal IUDs release a small amount of levonorgestrel, a type of progestin, directly into the uterus. This hormone works in several ways to prevent pregnancy: - Thickens cervical mucus, which makes it difficult for sperm to enter the uterus. - Thins the lining of the uterus (endometrium), which reduces the likelihood of implantation. - Inhibits sperm movement and function, reducing the chances of fertilization.
