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Information on the latest vitamin D news and research.

Find out more information on deficiency, supplementation, sun exposure, and how vitamin D relates to your health.

I would like to know the UVB irradiance in microwatts per square centimeters at which vitamin D is produced in skin in useful amounts. Is there a cut off below which no detectable amount is produced?

Ask the Vitamin D Council

Asked by  abjoshi46364100 on March 31, 2015