What is your take on sunlesstanning? It has been advertised as a very safe option (compared to tanning bedsand massive sun exposure), but I haven't been able to find any detailed reporton the chemicals behind self tanning.
The most common formulascontain dihydroxyacetone (DHA) as the active ingredient. DHA is not adye, stain or paint, but causes a chemical reaction with the aminoacids in the dead layer on the skin surface, turning it darker. Someproducts use erythrulose combined with DHA. Erythrulose works identicallyto DHA on the skin surface, but develops more slowly. The two chemicals usedtogether may produce a longer lasting sunless tan.
Many self tanners usechemical fragrances which may cause skin allergies or maytrigger asthma. Furthermore, some of them contain parabens. Parabensare preservatives that can affect the endocrine system.
For the 24 hours afterself-tanner (containing high DHA levels, ~5%) is applied, the skin isespecially susceptible to free-radical damage from sunlight, according to a2007 study led by Katinka Jung of the Gematria Test Lab in Berlin. Forty minutes afterthe researchers treated skin samples with high levels of DHA they found thatmore than 180 percent additional free radicals formed during sun exposurecompared with untreated skin.
Sources: various, including wikipedia
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