No, they don't. They practice first-aid. There's a big difference between slapping on a band-aid and a DIY hip replacement, or cancer diagnosis.
Maybe this is a uniquely American thing and with the self-sufficiency narrative being so at the fore. I don't fix my own car because I'm not a mechanic -- I share the symptoms with a professional. I don't tell my doctor what to prescribe or what's wrong with me because I'm not a doctor -- I share my symptoms with a professional.
As a concrete example, advertising prescription drugs direct to individuals in Canada is illegal. It's illegal in most countries. [1] As it should be!
Dietary supplements largely don't work, at all, and some of them are outright harmful. They basically do nothing, at best. So 75% of America probably, er, shouldn't. This is something a medical professional might tell you if you asked them. This visualization should help you understand the magnitude of just how little dietary supplements do -- it came up here on HN a while back as an example of a beautiful visualization [1].
Most multivitamins are totally worthless unless you're eating an incredibly poor diet. There's actually an association between multivitamin use and an increase in all-cause mortality [2] with a more pronounced effect in smokers [3].
So, I re-iterate, there's a reason these people went to school to become doctors.
Again, in context, what I said was that there's a big difference between first aid and supplementation and a diagnostics and treatment. Nobody is arguing people don't take supplements and that probably technically counts as medicine, however it's clear in context that's not the kind of medicine I was referring to. Also, people are by and large bad at it, and shouldn't.
Maybe this is a uniquely American thing and with the self-sufficiency narrative being so at the fore. I don't fix my own car because I'm not a mechanic -- I share the symptoms with a professional. I don't tell my doctor what to prescribe or what's wrong with me because I'm not a doctor -- I share my symptoms with a professional.
As a concrete example, advertising prescription drugs direct to individuals in Canada is illegal. It's illegal in most countries. [1] As it should be!
[1] https://www.cmaj.ca/content/169/5/425