Chemistry & Electricity第 83 / 100 题
A client with dehydrated skin should look for which type of ingredient to attract and bind water in the skin?
a.A strong surfactant such as sodium lauryl sulfate
b.A denatured alcohol
c.An abrasive such as aluminum oxide crystals
d.A humectant such as glycerin, hyaluronic acid, or sodium PCA
解析
Humectants attract and hold water in the stratum corneum, which is exactly what dehydrated skin lacks. Strong surfactants strip the barrier lipids, denatured alcohol increases evaporation and irritation, and abrasives are exfoliants that provide no hydration. In low humidity, humectants work best when paired with an occlusive or emollient to seal the moisture in.
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