7-Dehydrocholesterol

7-Dehydrocholesterol is a naturally occurring molecule found in the skin and other tissues. It is a precursor to vitamin D₃, meaning it undergoes a chemical change when exposed to ultraviolet (UV) rays from sunlight. This process converts 7-dehydrocholesterol into previtamin D₃, which then becomes active vitamin D₃—essential for maintaining healthy bones, immune function, and overall health. Essentially, 7-dehydrocholesterol acts as the raw material in the skin that helps our bodies produce vitamin D when we spend time outdoors.