What is the pH range of the skin's acid mantle?

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The pH range of the skin's acid mantle is typically between 4.5 and 6.0, making it slightly acidic. This acidity plays an essential role in maintaining the integrity of the skin barrier and protecting against harmful microorganisms. The acid mantle, composed of fatty acids, amino acids, and lactic acid, helps to create an environment that is inhospitable to pathogens while supporting the growth of beneficial skin flora. A pH within this range ensures optimal skin function, which includes preventing moisture loss and promoting healthy skin cell turnover.

While the skin can accommodate some variations outside this narrow range, a shift significantly above or below may lead to skin issues. For example, a higher pH (more alkaline conditions) can disrupt the skin barrier, leading to dryness, irritation, or increased susceptibility to infections. Thus, understanding this optimal pH range is critical for skincare professionals to tailor their treatments and products appropriately for maintaining healthy skin.

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