Homeopathy.
My son nearly lost his eyesight because of it. He had an eye infection and my ex took him to a Naturopathic "doctor" -- who gave him eyedrops. I've had and seen eye infections, and pretty much all the time some antibiotic eyedrops clear them right up. My sons eyes kept getting worse, I had just assumed they were antibiotic drops - I took a closer look. Homeopathic drops. I quickly got an MD to get us some antibiotic drops . . . Cleared up his eyes in just a day. And I've had a bone to pick with Homeopathy ever since.
No better than a placebo, it has been tested all over the world many, many times - and always fails to show consistent results under properly controlled testing. Most users of it consider the pharmaceutical companies evil. And yep, the pharmaceutical companies are gigantic monsters, and they test everything, any "medicine" that is as good or better than their drugs? Do you think that if the homeopathic "medicines" were just as good they would just let it slide? They would patent it, market it and sue the hell out of anybody still selling it.
Science, humanity, has lots to learn - but we are really good at some things. We can look right at atoms, and even measure the subatomic particles they are made out of. And the idea of water gaining a "memory" from anything interacting with it? Absolute bullshit.
Final note: I made a homeopathic uranium preparation! I went completely by the book for making homeopathic medicine "correctly". I did it for fun, and to ridicule and mock beLIEvers in homeopathy. I used real uranium ore - here is a link to my page: