Most guides to getting Vitamin D make blanket statements about how much ultraviolet light is available. The amount of sun varies throughout the winter and by t

Most guides to getting Vitamin D make blanket statements about how much ultraviolet light is available. The amount of sun varies throughout the winter and by time of day, as well as latitude. You can probably get more UVB at high noon in December than you can at 3pm in October. I'd love to see a guide that shows you how long you need to be out at a specific time, date, latitude and skin color.