I'm sorry but I'm not sure how this relates to what I wrote. You write "unless tests show" when I already mentioned having a prescription based on blood tests,

I'm sorry but I'm not sure how this relates to what I wrote. You write "unless tests show" when I already mentioned having a prescription based on blood tests, that taking supplements unnecessarily does no harm (so if you have a similar lifestyle/situation to those who were tested and are known to need it, you might as well right?), and that sunlight generates a second beneficial chemical and so one really should just be going outside when my comment explained there is simply not enough sunlight hitting the skin during the cold months to generate much of anything. I'm genuinely confused how this advice is suppose to be used