"The copper IUD has a piece of copper wire wound around the main body of the T, and some of the copper becomes oxidized when exposed to the uterine environment. These copper ions interact with ...

Only one, Paragard, is of the nonhormonal type. Paragard is a copper IUD, while hormonal types release varying amounts of a synthetic hormone called progestin. These hormonal types can cause acne ...

The two major types of IUDs are: 1. Copper IUDs: Hormone-free devices that take advantage of the spermicidal properties of copper to prevent pregnancy. They can be used for up to 12 years.