Eupher, as far as vitamin D3, you work in an office and get little outdoor time. I also question the FDA minimum daily requirements. It seems as if Vit D deficiency mimics a lot of other diseases, too, my research is showing me. The problem nowadays is that Doctors don't seem to look for older diseases thought to have been eradicated. Forget them even checking for parasites unless it's the last resort.
Currently, you are correct. My outdoor time is generally restricted to maybe an hour per day, max.
But at the time I was diagnosed with low vitamin D3, my ass was outdoors at least 3 days a week for several hours each day (mowing my
yard, which I hate), and other types of stuff that's done outdoors. Furthermore, the doc laughed his ass off when I told him the above, claiming that he'd seen people who LIVE outdoors in Florida with low D3.
As far as he was concerned, sunlight does not translate into D3/calcium/whatever.
For whatever reason, I needed major supplements. And those supplements work nicely, or at least they appear to be. I haven't had but mild colds since all that started and the fever blister thing has disappeared entirely (knock on wood).