Reply To: My husband who is 43 has been taking 100,00 IU of d for a year and his levels have not risen. He works outside for a living so he gets plenty of sunshine. Any suggestions or reasons why someone would not absorb vitamin d?
I think your decimal is in the wrong place. So do you mean he is taking 10,000(?)iu A DAY for a year? Or did you mean to type 1000 iu a day?
Does he weigh a lot more than 150lbs, if so he will need to take more? If he really is only taking 1000 iu then he needs to take a lot more.
Does he have any health issues OR gastro issues? People with gastro issues sometimes do not absorb Vitamin D well.
Does he take the Vitamin D with food because it needs “fats” to absorb best.
One factor in Vitamin D production from “sunlight” is that large amounts of “skin” must be exposed not just arms and face. Time of day, color of skin and latitude are other factors.
If it really is an absorption issue and not amount taken, then people have good luck with Vitamin D that gets “sprayed” into their mouth and absorbs that way rather than thru the intestinal track.