Blood test revealed Vitamin D3 level is 25, and my understanding is the acceptable range is (30-100 ng/ml; 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