It depends...: This depends on how much vit d you get from the sun. In spring & summer about 10 minutes of exposure to midday sun allows us to make enough d if you don't use sunscreen. In fall & winter months most adults need 5-8000 iu/day to achieve optimal levels of vit d. Testing your d levels can help you determine your needs. See http://bit.Ly/1dc7vna for details.
Answered 3/6/2016
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