Copper
"I'm 23 with no children, and got Paraguard inserted a little over a year ago. I'll start with the cons. Insertion process was quite painful but the pain only lasted about ten minutes afterwards. Since having Paraguard inserted I went from having no cramping at all around my period to having one or two instances per month of pretty painful cramping. My PMS is also pretty bad the day before I get my period but I think that's because I'm not controlling it with hormonal BC anymore. My period went from 5 to 8 days and is heavier than it used to be. Despite all of this, the side effects I've experienced do not outweigh the benefits of having Paraguard. I had way worse side effects when taking the pill. 100% happy."