WRT vitamins and supplements - My rule of thumb is to stick to ones that you can test for in the blood that’s actually correlated by peer review scientific literature for appropriate level ranges. So for instance I take D3 since there is a test for that as well as methylated B9/B12 (homocysteine). Fish oil as well (omega 3). It doesn’t solve the adulteration issue but at least I can tell if I’m getting sugar pills.