What is the normal pH range of the skin?

The normal pH range of the skin is between 4.5 and 5.5, making this range important for maintaining the skin's health and protecting it from harmful bacteria and environmental factors. This slightly acidic pH helps to support the lipid barrier of the skin, also known as the acid mantle, which functions to keep moisture in and prevent pathogens from entering.

When the skin's pH is within this range, it can effectively perform its roles in protection, sensation, and regulation. A pH that is too high or too low can disrupt this balance, potentially leading to skin issues such as dryness, irritation, or increased susceptibility to infections. Understanding the normal pH range is essential for estheticians when formulating skin care products or treatments, as applying products with the wrong pH can negatively impact the skin's overall health.