Copper
"I decided to get the Paragard Iud because my body is very sensitive to hormones from birth control. I am currently 18 years old, I have had my IUD for 10 months ( I got last April) when I was 17. I have never had children, so my doctor was concerned about how I would do with the IUD and recommended I try something similar to the iud  called Skyla but it had hormones. Against my doctors concerns, we decided that the paragurd was the best option for me. When my paragard got inserted, it felt like bad period cramps. it really didn't hurt just uncomfortable for a few seconds. The iud has been great, periods can be painful/heavy occasionally but not bad, I have no other side effects. my fianc"