99% of supplements either do not work, or make you sick. Great business model though.
(I only take vitamin D in autumn and winter. Most white people have a vitamin D shortage in that time of the year)
If you don't have your levels tested you don't know if you are deficient. Even if you were deficient or kind of on the low end of the range and then took D how do you know it's working? Working doing what? Our foods, like milk, are fortified with vitamin D and if you eat "properly" you don't "need" supplemental D. Ask a doctor.
During Covid Fauci said maybe 2K D3 and a couple of grams of C wouldn't hurt. But on the other hand he could positively say it would protect you either.
I'm making some kind of point, I take D3 right now myself. A while back my kidneys were failing and calcium was high and docs though maybe my D3 supplement was causing it; I had been taking 17K a day. They tested me and it wasn't that. Many, many supplements "work," i.e. they have a biological effect in the body you could measure in different ways. The more important question is if they're cost effective, is it worth the money and hassle of downing multiple pills from many bottles each day. Some kind of like doing that though. They enjoy the placebo effect, "hey I took something so now my workout is going to be more effective." The PWOs are a prime example. They do do something, you can feel it, but do they actually make you more effective in the gym?
Supplements are drugs, there is no difference. Many Rx drugs also do not actually work and sometimes they are downright harmful instead.
