In what tissue(s) must a molecule of vitamin D be chemically altered to yield a compound that is fully active?

Question

Quizplus · Accepted Answer

Vitamin D must undergo two hydroxylations, the first in the liver and the second in the kidneys, to become fully active. The liver converts vitamin D to 25-hydroxyvitamin D, which is then transported to the kidneys where it is converted to the active form, 1,25-dihydroxyvitamin D.

In What Tissue(s) Must a Molecule of Vitamin D Be