Copper
"I got the Paragard in the spring of 2013 because I couldn't take hormonal birth control (terrible side effects of nausea, migraines, and mood swings). I'm SO glad I got the Paragard. The insertion was a little painful because I've never had children and the next few days I experienced moderate to severe cramps. Now my periods are longer and heavier and sometimes I have cramping, but those are the only side effects I have. It feels great not to have to worry about getting pregnant for an entire ten years, and I consider the side effects of the Paragard minimal in relation to my experience with other birth control methods."