The human body obtains vitamin D either from the diet or sun…

The human body obtains vitamin D either from the diet or sun exposure. Darker-skinned individuals require more sunlight to create adequate vitamin D stores as the increased melanin in their skin acts like sunscreen; thus, it blocks the necessary UV required for vitamin D synthesis. Therefore, if these individuals spend inadequate time in the light, dietary sources of vitamin D are necessary. What form of vitamin D requires sunlight for its formation?