You'd have to get follow up to see if Vitamin D has gone up after taking it.
I was Wrong on the internet (lots of food has vitamin D including Eggs and Mushrooms): Vitamin D supplements may not be absorbed as digestion isn't the normal process for obtaining it.
I was Wrong on the internet (lots of food has vitamin D including Eggs and Mushrooms): Vitamin D supplements may not be absorbed as digestion isn't the normal process for obtaining it.