The copper IUD or coil (ParaGard) is a non-hormonal method of birth control. Its main advantage over hormonal methods is that it contains no contraceptive drugs and therefore permits natural, ovulatory cycles.
Hormonal IUDs are different from all types of hormonal birth control in that they do not suppress ovulation and therefore can permit natural cycling.
Other benefits of hormonal IUDs are that they can dramatically decrease menstrual flow and relieve symptoms of endometriosis.
Natural methods of birth control include fertility awareness-based methods, diaphragm, condoms, and the copper IUD or Paragard.