Theoretically the body cannot absorb calcium without enough vitamin d. i have vit d deficiency but my calcium levels are good. what's up with that?

Bones: You may not be able to absorb calcium properly , but you are quite capable of taking it out of your bones. This is why vit d deficiency is a problem. You are not absorbing it, so your PTH levels increase slightly and you suck your bones of ca. See your doctor.

Can maintain blood: The level of calcium in your blood has nothing to do with how well you're absorbing calcium. We have a huge reservoir of calcium in our bones ; the amount in our blood is regulated by parathyroid hormone; we need to keep serum calcium levels within a narrow range or we die. Even if you absorb no calcium you can maintain a normal blood level due to the stores in your bone.See http://bit.Ly/1ekkvkv.