Darken Your Skin

[swisston]

As it increase the body's natural resistance to UV damage, so would it not also increase the risk of Vitamin D deficiency?

Most people would benefit from taking a vitamin D supplement anyway. I don't believe that it is a good idea to depend on the variable amounts of sunlight we get, especially now that people are using sunscreen more. Something like half of all people are deficient and the majority have well below optimum levels of vitamin D.