Sensible exposure to ultraviolet rays, which includes the body's exposure for five to 30 minutes a day depending on the time of day, season, distance from the equator and skin pigmentation, is advised, said Dr. Robert Sayre, PhD, of Rapid Precision Testing Laboratories in Cordova, Tenn. "UV exposure is required for the body to make vitamin D. Moderate UV exposure triggers vitamin D synthesis in the skin while little to no exposure to UV rays can create a vitamin D deficiency ... We need UV exposure to gain and maintain health-enriching vitamin D levels." "Indoor tanning in moderation and at acceptable frequency and duration periods exposes the body to the same UV rays that sunlight provides but in a much more controlled environment," he said. Full Article at Street Insider