"Recently I read an article on Dr. Oz Show.com on tanning. In this article he said to avoid self-tanners because the browning ingredients may damage the DNA in skin cells. Is this true of the ingredient DHA? He also frowns upon spray tanning micro particles, which can be inhaled. What do you think?"
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Self-tanners use an active agent called dihydroxyacetone (DHA). They react with amino acids in the skin to make a brown coloration. There is some validity to the concern of spray tanning if you're not protecting your mouth or nasal passages. However, there are no epidemiological studies linking DHA exposure to human skin cell damage or cancer risk. There are some studies showing mutagenic activity in some bacterial strains, which is probably where Dr. Oz is getting his information.

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