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Those who avoid or are not exposed to summer midday sunshine may also     require vitamin D supplements.

Dark-skinned individuals may require extra vitamin D because melanin acts like a sun-block, prolonging the time required to generate vitamin D.

Obese people have lower levels of the circulating form of vitamin D, probably because it is deposited in body fat compartments and is less bioavailable.

Patients with chronic liver disease or intestinal malabsorption , parathyroid glands removed

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