Just a side note to anyone who is terrified of seeing 'copper toxicity'....you eat and drink more copper in your diet than is released on a daily basis from this IUD. Researchers know this which is why they designed the IUD the way they did. The actual amount of copper that is released does not impede on your bodies natural copper concentration (it is produced naturally). You need copper in your body if you want an immune system, you need it if you want to keep your blood, you need it to intake iron into some of your bodies systems, you need it to digest food and so many more things. There is no life without a good portion of copper in you. To get to the serious condition of copper toxicity one would actually need to ingest huge of amounts of copper in your diet, like cooking with a junk copper based frying pan for 10 years, have a severe disturbance in your copper metabolism due to disease, or have a serious genetic condition to really raise your copper levels to threatening levels.
There is really nothing to worry about, copper wise, when it comes to the Paragard IUD. The list can be so much longer for side effects just with the initial implantation due to it being surgery. Countless millions of women can swear by the effectiveness of this method because they have tried the hormonal variants before with no luck.