If you exceed calcium and phosphates intake by an amount sufficient to compensate for the excess D3, does that "do the trick" or is that a bad hack? I've seen certain 9 pills a day multivitamin formulations who deliver much much higher than the daily dose of everything, I think Life Extension sells them, and I'm wondering if they are hip to these facts.... I used to buy their vitamins. Now I just take the ones that are one a day pill instead of 9, and those never exceed the daily IUs.
Another question for you, does supplementation work as intended when our diet is insufficient, or is it just a gimmick? I've always wondered about this. By work, I mean, if you were to have a blood test in two parallel trials, one where you supplemented but had a crappy diet and another where you ate the "perfect" diet that supplied the daily IU needs, would the blood work show equal amount of each mineral/vitamin/etc in both cases?