I'm writing from São Paulo, Brazil. I started supplementing vitamin D3 back in July 1st, 2015. From very early on I started alternating between 7,000 IU and 10,000 IU per day. I had my blood level checked on October 1st, 2015 and it was 52.4 ng/mL. From then on, I started taking mostly 10,000 IU after the main meal in the evenings and, on April 27th, 2016, I had my blood level checked again and it had risen to 64.2 ng/mL. I was pleased that I had succeeded in boosting my 25(OH) vitamin D blood level. I have recently had a blood test (December 10th, 2016) and, to my surprise, it has gone up to 86.8 ng/mL! I am a little concerned about it because, although the normal range is 30 ng/mL to 100 ng/mL (according to the laboratory) and there are no known cases of toxicity up to 150 ng/mL, the increase rate between tests has doubled over a similar period of time. The bottom line is I do not know whether or not my blood level has plateaued and it will not rise even if I carry on taking 10,000 IU per day. What if it has not plateaued yet and it will keep rising if I carry on taking 10,000 IU per day? It might easily rise above 100 ng/mL and that is really worrying. How should I go about supplementing vitamin D from now on?