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Tanning products, both sunless and sun, work on the epidermis, or the outside layer of your skin, and not the dermis or inner layer.
Today's formulas are light-years ahead of those bizarre orange concoctions of decades past. A great sunless tan can be indistinguishable from the real thing; the key is a good product and a skilful application.
When you apply a tanner or tanning lotion, creme, spray, or toilette by gently rubbing the product into your outer skin layer, those that are most effective (the ones that list dihydroxyacetone or DHA as an active ingredient), begin to work within around 40 minutes to an hour.
DHA reacts with amino acids in the epidermis, producing a natural pigment called melanoidin that bonds with proteins in skin cells. The results are a change of color that can last up to about seven days.
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