Be careful with vitamin D though. That is one of the very very few vitamins that you can actually take too much of because it's fat soluble, not water soluble, so excessive vitamin D will build up in your fat cells rather than just getting peed out. It's called vitamin D toxicity (VDT) and it can have some unpleasant neurological effects among other things.

So it's probably a good idea to get your levels checked anyways just to make sure you're taking the right amount if you need it.