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According to ITV news, Australian researchers have found that Vitamin B3 protects against the immuno-suppressive effects of sunlight. They say that the vitamin "energizes" cells so that they maintain their immunity. Cells with strong immunity are much less susceptible to skin cancer.
Vitamin B3, known as niacin in the U.S., promotes immunity from damage done by both UVA and UVB light, something that conventional sunscreens may not do.
Lotion or supplement
Virtues of a Tanning Bed
A couple of dermatologists objected to the study, suggesting that "...oral vitamin supplements are a safer, much less expensive, and more convenient method for improving vitamin D status."
If you are up for some reading, check out this summary of the Vitamin D Symposium in San Diego last month. If you are really interested, there is a link in the first paragraph to the slides that the speakers used in their presentations.