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There are three types of UV light, A, B, and C; they are reviewed. DNA damage from UV light is a concern and the dose makes the difference. UVA is the tanning ray and is responsible for tanning the skin; it does not burn. UVB and C penetrate deeper and can be a problem if we burn. We need UVB to make vitamin D. UVC light is filtered by the ozone layer and protects...

Dr. Grant explains the various forms of UV light and how they relate to cancer risk. UVA light penetrates deeply but most sunscreens don't block it and it is what causes melanoma; this actually increases the risk for melanoma! If you shadow is shorter than you are, UVB is present and will make it possible to make vitamin D. Vitamin D deficiency is linked...