Bloodletting used to be a common practice as well. It had tens of thousands of ardent, enthusiastic practitioners. Turns out, it was quackery.
Also consider the Incas: they believed that a shaman known as El Hanpeq could magically cure their ailments with potions and minerals. I haven’t seen ole El Hanpeq make his way around in my lifetime.
Folks, the year is 2024 with the literal universe of all known information at our fingertips on our hand computers known as phones. Instead of making great progress, we have turned again into troglodytes. Crazy conspiracy theories, self-obsessed magical thinking, and, yes, ingesting veterinary deworming medication as a means to cure all things from COVID to cancer are seen as markers of a virtuous lifestyle according to a select few enlightened individuals.
Please stop believing that El Hanpeq’s magical potions can heal you. Crimony.