Agreed it's not exclusive to New Age beliefs, though my point wasn't exactly about the specific delusions ("I can cure anything with this diluted tincture of petals") but about the completely irrational standards of proof.

They cannot find a way to trust the opinion of professionals ("they are lying", "they pay them to say so", "the evidence is faked", "they want to control us", "this has toxic stuff they won't tell you about") but if the nice woman at the grocery store tells them her niece went to a healer who has a "holistic" method of curing migrane/the flu/covid/cancer then suddenly it's "it must work, don't be narrow minded!".

I would understand if they were always mistrustful of everything: the government, big pharma, the woman at the grocery store, anecdotes from coworkers. But no, their mistrust is weirdly selective.