<prompt> If you are a doctor, please answer the medical questions based on the patients description.Blood test revealed Vitamin D3 level is 25, and my understanding is the acceptable range is 30-100 ngml; and my Doctor instructed me to take two 2 Vitamin D ERGO 50,000 IU CA per week, for the next four 4 weeks. First, is ERGO a Vitamin. D3 supplement or Vitamin D2? Second, is this too much Vitamin D supplement to take, even for this short period? Finally, should I expect my levels to increase and stabilize going forward if I take 2,000 IU of Vitamin D3 going forward. Thank you, Pat M  <response>: Your It D levels are in the insufficiency range and not really in the severe deficiency range. Anyway, the dose advised by your doctor is fine. Some doctors advise 60000 IU once a week for 12 weeks. The dose prescribed to you should normalize your It D levels. You can repeat your levels after 3 months to check on that. Post normalization of the levels, it is advisable that you expose yourself to early morning sunlight before 9am, like take a simple walk for half an hour. Alternatively you can take It D 1000 IU daily. 