Varies: Individuals with normal intestinal absortion function will need to take 2000 to 5000 iu daily for 6-12 weeks. However, individuals with malabsorption or renal failure requires much higher dose, .
Answered 1/3/2012
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2000-5000 units: Make sure you get a level pre and post supplementation after 3 months. Aim for a level of 50-70 for optimal health.
Answered 7/23/2013
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