What is the normal pH range of healthy skin?

The normal pH range of healthy skin falls between 4.5 and 5.6, which reflects a mildly acidic environment. This acidity serves several important functions for the skin, including maintaining the skin barrier, inhibiting the growth of harmful bacteria and fungi, and preserving hydration levels.

Skin's acidity is crucial in protecting against various pathogens and preventing infections. The acid mantle, which is a thin film of fatty acids and lactic acid, contributes to this pH balance. When the skin's pH veers too far from this range, it can lead to issues such as irritation, dryness, and an increased likelihood of infections.

Other ranges presented, such as 3.0-4.0, would indicate a more acidic environment than normal skin should have, potentially leading to irritation. Ranges of 5.0-6.0 and 6.5-7.5 indicate more neutral to alkaline levels, which can disrupt the natural acid mantle, compromise the skin's barrier function, and leave it vulnerable to conditions like acne or dermatitis.