vitamin d is needed for calcium absorbtion, and all other vitamins piggyback off of calcium
I've read that D-3 is better.
Below are the 6 main side effects of too much vitamin D:Elevated Blood Levels. ...
Elevated Blood Calcium Levels. ...
Nausea, Vomiting and Poor Appetite. ...
Stomach Pain, Constipation or Diarrhea. ...
Bone Loss. ...
Kidney Failure.