Hi Alberto, I can tell you that I vitamins are def a good idea but make sure you pay attention to quality. Not all supplements are made the same and some have dangerous synthetic additives and extracts.  Personally I take a multi from Dr. Fuhrman and it comes with Vit D.  I check my levels of vitamin D every few years to make sure I am in range.  If you check your levels and find you are too low you would need to take extra vitamin D... Hope this helps!