One thing most people don't know is that how much vitamin D your skin produces depends highly on your skin color. From memory, white skin produces 6x as much a

One thing most people don't know is that how much vitamin D your skin produces depends highly on your skin color. From memory, white skin produces 6x as much as black skin. This is probably the main reason for the white skin mutation, as we moved out of sun saturated Africa. If you have dark skin, you very likely need vitamin D supplements if you don't live in a very sunny place.