Be careful, because too much of something good may end up being bad for you. It is true that Calcium metabolism depends on activated Vitamin D and that activated Vitamin D depends on exposure to sunlight.  That said, too much calcium may be harmful to our own blood vessels, particularly the small coronary arteries that provide oxygen and blood flood to the heart muscle.  So maybe it is time to consider that too much of something like calcium, in the form of a supplemental vitamin, added to our normal dietary calcium consumption may actually be very harmful to our bodies.

http://health.clevelandclinic.org/2014/05/supplements-taking-many-can-hurt/