My stepdad was an early version of these people. He didn't go to doctors and ate raw onions, a lot of them, because he'd heard on the radio that they were in the Bible as some kind of secret miracle drug that "Big Medicine" doesn't want you to know about."
When he died, I went in with the hazmat crew to clear out the hoarder mess he'd made of the house. You couldn't get to the stairs because he'd been buying online vitamins, boxes and boxes of them, and they were piled up there. He'd also opted out of Medicare.