الفهرس 
Physiology of vitamin DOnly 14 pages are availabe for public view
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Abstract
Vitamin D plays an essential role in calcium homeostasis and bone metabolism. Recent evidence suggests that vitamin D may also be important for a variety of non-skeletal outcomes including neuromuscular function, immunomodulation, and control of other hormonal system.
It is well known that exposure of skin to direct sunlight is the most important source of vitamin D, so that according to many causes like fear of skin cancer, traditional clothing and spending most of the time indoors many Egyptian girls are exposed to vitamin D deficiency.
The aim of this study was to evaluate the magnitude of vitamin D deficiency/sufficiency in a sample of Egyptian girls.
The present was conducted on 80 girls age from (2-10) years old randomly selected from outpatient clinic of Ain Shams University and their healthy relative. We excluded boys, age<2 years or >10 years, suffering from chronic illness and on drugs as corticosteroid and anti-epileptic drugs.
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