> So no, you should not take something merely because it's "probably harmless"

You and I should not. But I'm also not going to bother correcting someneone taking homeopathy for a cold. It doesn't do anything. But unless it contains heavy metals, it also isn't hurting.

When I found ivermectin in my father's fridge, on the other hand, I absolutely asked him what he was taking it for. When I confirmed he's also taking real medicine, I dropped it provided he told his doctor in case there are drug interactions. (There aren't. Ivermectin is pretty safe. That's why the nutters congregate around it.)