About 20 minutes: daily w/ as little clothing as possible is recommended if ok w/your doc. Season of the year and location also matter. Best to get your D3 level checked by doc and supplement as needed. Peace and good health.
Answered 5/28/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
9 doctors weighed in across 2 answers
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