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An inactive compound that is converted by enzymes into a biologically active hormone.
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Vitamin D3 then circulates in the blood and is transported to the liver, where it is converted to 25-hydroxy-vitamin D [25(OH)D], This is often called a prehormone as it eventually gets converted in the kidneys and in many tissues to the hormone 1,25-dihydroxy-vitamin D (also called calcitriol, or activated vitamin D).
4) This prehormone is the body's main storage form of vitamin D, and the amount of calcidiol available to the body is what determines vitamin D status.
It is a precursor to a hormone, and this prehormone is responsible for making a very important regulator of cardiovascular processes," he said.
Prehormone 25-hydroxyvitamin D is found in the blood, but very little is found in milk.