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Dan
SAD lights do NOT give you vitamin D. People with HIV often have Vitamin D deficiencies, and a SAD light is not a substitute for supplemental vitamins. They impact circadian rhythms by shining bright light into your eyes (usually recommended as indirectly, not staring at the light)--so your eyes have to be open when you use them. They have no effect on your skin--unlike the real sun. Mayo Clinic online has more info about SAD lights.
March 6, 2012 • Madison, WI