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The acid mantle is a very thin, delicate, slightly acidic film covering the entire surface of human skin, serving as a protective barrier against pathogens and reduces body odor. The acidic pH at the skin's surface is primarily maintained by free amino acids and α-hydroxy acids excreted from sweat; free fatty acids and amino acids from sebum; and urocanic acid and pyroglutamic acid. While the viable epidermis below the stratum corneum has a neutral pH of around 7.0, the surface pH of the skin's acid mantle typically ranges between 4.5 and 6.5, with an average assumption of 5.0 to 6.0.
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