Copper
"I've had the Paragard IUD for almost a year now. I chose Paragard because I wanted to see how my body would do without hormones as I've been on some form of BC since I was 16. I do have really long periods still. Currently on day 11, but only a couple days are really heavy. The annoying part for me is that my body will trick me, make me think I'm done, then several hours later, surprise! And I've never been one to cramp and I cramp now. Midol helps some.  I've also lost about ten pounds since having the paragard, no idea if it was the lack of hormones from other birth control or not. Insertion was extremely painful for me (I've never had a child). Overall I think Paragard is a good birth control option."