Till the year 2000, in United States (US) the recommended vitamin D daily dose for men and women of ≤50 years was 200 IU/day. Fortification of commonly used food items was one source of supplementation of vitamin D. Most of patients develop due to inadequate exposure to sunlight and eating less of vitamin D containing foods. Vitamin D deficiency has been reported around the globe. It was recognized as early as 1860's that vitamin D is important for bone health and recently its importance in extra-skeletal health has come to light.
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