OK everyone, I'm having a bout w/ chemo brain...
 

now WHY again is Vitamin D3 better than Vitamin D? Thank you.

Vitamin D3 is the natural form that the skin produces when exposed to sunlight. Then the liver converts it (to I forget what) and THEN the kidneys convert it to the useable molecule. That is why as we age a deficiency can occur because naturally liver and kidney function declines.

D2 must be converted to D3 in order to enter into the biochemical cascade described above. This too occurs in the kidney so, if your body is alittle lax in the kidney area, you might not get very much D3 to enter the cascade.