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When needed a cell can convert calcidiol to calcitriol which is then used to turn on or turn off certain genes.

One may suspect that the whole point of the gene regulation by calcitriol is deliberately linked to exposure to the Sun.

This is then further converted into the active form of the vitamin, calcitriol, which acts as a powerful hormone. 25OHD levels in the blood are considered the best indicator of a person’s clinical vitamin D status.

To make it usable by your body, your liver converts it to calcidiol, then your kidneys turn it into the active form, calcitriol.

Some studies indicate that not getting enough of this mineral may trigger the release of calcitriol, a hormone that causes the body to store fat.