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My vitamin D level was at 12 ng/ml, yet, I work outside in the sun all day. What could be causing this? I have possible inflammatory bowl disease, but how would that stop me from getting vitamin D from sunlight? The doctor has me on 20,000 UI daily for a short time, yet I don't feel any better. How long does it usually take to start seeing the effects? .

Asked by  hambone007_9781947800 on March 7, 2015

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