How do you know if you are deficient? Are you at risk? Ask yourself these simple "ABC" questions right now:
For example, although vitamin D is produced in the skin from a cholesterol derivative when we are exposed to UVB radiation from the sun, because of the axial tilt of the earth, the further north you live, the less the sun's rays activate it. Therefore, sun exposure does not always equate to optimal vitamin D status.
Stop being afraid to supplement! The fact is that the universal intake of up to 40,000 IU vitamin D per day is still unlikely to result in vitamin D toxicity.
http://www.naturalnews.com/027345_Vitamin_D_sun_exposure_blood.html
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