PSI Barbering Practice Exam 2026 – All-in-One Resource to Master Your Certification!

The average pH level for hair and skin typically falls within the range of 4.5 to 5.5. This slightly acidic environment is important for maintaining the integrity and health of both hair and skin. The pH balance helps in preserving the natural moisture and oil levels, which are crucial for protection against environmental stressors.

When the hair and skin have a balanced pH, it helps keep the cuticle of the hair closed, giving it a shiny and smooth appearance while also safeguarding the skin's barrier function. An excessively high pH can lead to dryness, brittleness, and damage for hair, while it can disrupt the skin's protective barrier, leading to irritation or infections.

Overall, a pH level of 4.5 is considered optimal for both hair and skin health, highlighting the significance of maintaining this balance for aesthetic and functional purposes.