«These types of cancer locally
convert calcidiol to calcitriol, a vitamin D metabolite that has significant anti-cancer activity in preclinical models, and could prove to be an important adjunct therapy.»
While 7 - dehydrocholesterol is tucked tightly within the lipids of skin cell membranes, previtamin D3 is an unstable compound that over a brief period of time
converts into vitamin D3, causing it to be released from the cell membrane.12 Vitamin D3 then travels into the blood where it binds to vitamin D - binding protein (DBP).16 Eventually, it is delivered to the liver where it is
converted into its primary storage form,
calcidiol, which is likewise transported in the blood by DBP.8