sometimes i think that vit D is overrated, and the only reason why people that have high levels of vitamin D are healthier is maybe because they just happen to have higher levels of vitamin D, because they stay outside longer, and the sun just warms their bodies more, and they therefore become less depressed, more healthy, and their overall well-being is better. so the result is higher levels of vitamin D, yet the vitamin itself having nothing to do with it, and just the warmth of the sun having a lot to do with it.

but maybe they disproved this already, not sure, but all i know is when i take vitamin D, i dont really feel much of a difference.