Adding on this point, in my research I found blood serum testing to be wildly imprecise.
The conclusion of my study was that we should do more studies where we take regular blood level samples and adjust dosage to achieve a certain average level (near the upper level of the range).
5000IU D3 (D2 is about 1/3-1/2 as effective at raising blood serum levels) is a good starting point.
The conclusion of my study was that we should do more studies where we take regular blood level samples and adjust dosage to achieve a certain average level (near the upper level of the range).
5000IU D3 (D2 is about 1/3-1/2 as effective at raising blood serum levels) is a good starting point.