I take Thyroxine which sorted out the defunct thyroid after only a little while, and I used to get hay fever until I took a homeopathic remedy the chemist had on the shelves.

I know it could not work - should not work, in no way should it have worked - but it did. It worked for a couple of years the first time, so I tried it again and it is still ongoing. I don't like finding out that such things are effective because it leaves me baffled, but I'd rather that than hay fever.