Copper
"I gave Paraguard 8 pts, but I really do like it much better than hormonal birth control pills. I only gave it an 8 instead of 10, because it does make my periods heavier and a little longer than in the past. Because of this I developed iron deficiency anemia, but the anemia is easily controlled with a prescription iron supplement 3 times per week (Mon/Wed/Fri), which is OK. I appreciate Paraguard because one of the other medications I take makes hormonal birth control less effective. Since Paraguard is not a hormonal birth control, it works perfectly. 

I have had a previous Paraguard IUD that had to be removed because of a problem, but this second one has given me no problems.I didn't have to pay for the second one because of the problem"