Though both vitamin D2 and vitamin D3 can increase blood levels ... that consuming 400–800 International Units (IU), or 10–20 micrograms (mcg), of vitamin D should meet the needs of 97% ...
Why we chose it: Pure Encapsulations Vitamin D3 gets our pick as the best high ... dose supplement — at least 10,000 international units (IU) daily. This may be followed by a maintenance dose ...
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