Three to five thousand iu per day has been shown in studies to be safe for the vast majority of people. There are factors which make it likely that some one will need more than that typical dose. If you have a chronic inflammatory condition and or your overweight or obese, you might need to bump that up into the ten thousand iu each day range. For most people, three to five thousand a per day is a sweet spot to maintain them in that forty to 60 range - optimal for immune function.

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