What is the pH range of human skin?

Human skin typically has a pH range of 4.5 to 5.5, which is considered slightly acidic. This acidity plays a critical role in maintaining the skin's barrier function and overall health. The slightly acidic environment helps to inhibit the growth of harmful bacteria and fungi, while also supporting the skin's natural flora, which contributes to its protective mechanisms.

This pH level is important for various processes, including the functioning of enzymes and the maintenance of moisture balance. Skin products that are formulated to match this pH range are more likely to be effective and well-tolerated, supporting skin integrity and function. Products that deviate significantly from this pH range could disrupt the skin's barrier and lead to issues such as irritation or increased sensitivity.