by Daniel Brouse Did you know you photosynthesize? Most of the vitamin D in your body is created by exposure to sunlight. “During exposure to sunlight, the high-energy UV photons (290-315 nm) penetrate the epidermis and photolyze 7-dehydrocholesterol (provitamin D3) to previtamin D3. Once formed, previtamin D3 undergoes a thermally induced isomerization to vitamin D3 […]