During the Pan I took a lot of VitD. It started giving me the feeling that my heart was beating out of my chest, so I stopped.
How much Vitamin D? Vitamins are good but as with many things, the poison is in the dosage. You can definitely take too much of it.
Vitamins A, D, E and K can be overdosed… But for vitamin D to be toxic you would have to veer quite far from the posology.