By Dr. Mercola Melanin is the pigment that gives skin (as well as hair and eyes) its color. Dark-skinned people have more melanin in their skin, and the presence of dark melanin, known as eumelanin, is associated with a low skin cancer risk.1 It would seem plausible, then, that creating an artificial way to stimulate pigmentation in human skin could lower the risks of damage from excessive exposure to the sun’s ultraviolet (UV) rays. There is a natural way to do this — get regular exposure to the sun in short increments, gradually building up your time spent in the sun to create a natural tan. As part of my healthy sunbathing tips, I recommend building up your tolerance by starting early in the spring, with as few as five minutes of exposure time, and gradually increasing the time you spend in the sun to avoid getting burned. Once your tolerance has been built up, aim for 15 to 30 minutes of unprotected sun exposure two to four times per week, around midday, to maximize vitamin D
http://articles.mercola.com/sites/articles/archive/2017/06/27/sunless-tanning-drug.aspx
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