| http://www.w3.org/ns/prov#value | - The U.S. Institute of Medicine, for example, recommends getting a mere 200 to 600 international units (IU) of vitamin D a day, an amount far too low to have much therapeutic effect.Since summer sun exposure creates about 20,000 IU of vitamin D in the skin in just 15 minutes, supplementation with at least 5,000 to 10,000 IU of vitamin D daily, particularly during the winter, is preferable.
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