The most biologically active form of vitamin D,calcitriol (1,25-dihydroxyvitaminD),is made in the ________.

Question

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Calcitriol is made in the kidneys, where it is formed from its precursor molecule 25-hydroxyvitamin D. The liver is responsible for the initial conversion of vitamin D obtained from sunlight or dietary sources to 25-hydroxyvitamin D, but not the active calcitriol form. The bones and small intestine play important roles in vitamin D metabolism and function, but do not produce calcitriol directly.

The Most Biologically Active Form of Vitamin D,calcitriol (1,25-DihydroxyvitaminD),is Made