What is a typical pH level of healthy hair?

Healthy hair typically has a pH level ranging from 4.5 to 5.5. This slightly acidic pH helps to maintain the integrity of the hair cuticle, which is crucial for keeping the hair smooth and preventing damage. When the hair's pH is within this range, it is more resilient to environmental stressors and chemical treatments.

A pH level below 4.0 may lead to excessive acidity, potentially damaging the hair structure, while levels above 5.5 can make hair more porous and prone to dryness and brittleness. Therefore, maintaining a balanced pH is essential for optimal hair health.