Comment by sphericalgames

There are already good studies and it is well known that Vitamin D is toxic if too much quantity is taken over time. 5K IU is 5x more than the recommended daily limit. She should have dropped to 1K IU after 4 months of taking 5K IU, that is, if she continued not to get regular sun exposure or eat food rich in Vitamin D. The problem lies in the prescribed amount and the duration and not because of lack of studies. Did a doctors advise 5K IU without a time limit?