The D used by doctors on RX is antequated... D2 and does not work much at all.
D3 OTC is what you will want. The general ratio for increasing is 1000IU D3 daily for every 10 points you need to raise (US units).
Your target should be 50. (my doctor wants me at 70!).
I was taking 5000 units a day 8mos out of the year (I am outside in summer)...and I tested only at 43. Should have been a bit higher...but it was still good compared to other people posting all over the boards. I have seen one fellow at PD here who tested at 3 ...
Here is a thread with the newest research and medical videos:
http://neurotalk.psychcentral.com/thread92116.html
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Weezie looking at petunias 8.25.2017
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