Are you deficient in Vitamin D? by Dr Harold Gunatillake This is a very important vitamin necessary to every cell in the body for its normal functions in fact every cell has an opening or receptor to vitamin D. Vitamin D is manufactured in your skin from cholesterol in your body. How do you find out whether you are deficient in vitamin D? Dark people make less vitamin D in their skin due to the barrier action of the pigment layer in the basal layer of the outer skin preventing UV rays of the sun getting into the deeper layers of the skin. Furthermore, dark people avoid the sun generally. White people need only about 20 minute exposure to the sun for an adequate requirement of vitamin D ...
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