Parvaiz A. Koul
Vitamin D is a group of secosteroids involved in a h ost of functions in the human body. While the role o f vitamin D in bone and mineral metabolism has been well studied, its activities on other physiological and pathophysiol ogical processes have been of increasing interest in recent yea rs. Vitamin D, which is photosynthesized in the skin or is derived from nutrition, is metabolized two times, be fore it mediates its calcemic effects by binding to the nuclear vitamin D receptor (VDR) (St-Arnaud, 2008; Janssens et al., 2 009).
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