German fertility awareness method "sensiplan"

Not that poster, but you are misunderstanding how / to what it is toxic. It, like many other birth control methods, makes it toxic to sperm only. The copper has no effect on the woman using it.

The IUD works by releasing copper ions, but they aren't going to migrate all over your body: a study of rats in 1972 found that putting copper in one "horn" of the uterus didn't affect the rest of it, indicating that copper isn't planning on escaping your reproductive organs. And it's the ions that cause the real trouble to sperm. A copper IUD's ions create a completely toxic environment to foreign bodies, including sperm; that environment prompts sperm phagocytosis, in which the sperm is killed and then "devoured" by other cells.

It's not just that the copper IUD kills sperm, either. It looks like copper also alters the thickness of cervical mucus, making it harder for sperm to get through, which is how the hormonal IUD works too. But the level of copper in the mucus of the cervix also means that the sperm can't actually penetrate it.

[S]tudies have shown that the copper ion levels released by IUDs are actually tiny, and certainly not enough to do anything to human health. In fact, a 1980 study found there was no difference in bodily copper levels between people with copper IUDs and people without them

http://www.bustle.com/articles/144818-the-one-thing-nobody-tells-you-about-the-copper-iud

/r/birthcontrol Thread Parent