Here are a few reasons why that’s important to consider, and tips to help you choose what’s right for you. The liver converts vitamin D2 and D3 into calcidiol, but they differ in their absorption ...

No matter what the source, though, vitamin D must be activated within the body—first through the liver, which converts vitamin D to calcidiol, and then in the kidney, which forms what's known as ...

One 2020 study in Experimental Dermatology found higher levels of a precursor to vitamin D (calcidiol) in redheads, ...