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[–] 22724430? 0 points 2 points (+2|-0) ago 

dose should be to optimize serum levels, which most doctors are testing for these days. 36-48ng/ml is a good range. 2000iu/day gets most adults in this range. but you could also do 5000iu every few days. if you're getting a lot of sun exposure hold off on the pills, your body is making enough. when you're cooped up indoors for the long winter months you likely need a higher dose.

additionally, D3 can be taken in a megadose at the beginning of an infection or virus (100,000iu/day for up to 3 days)