West Virginia Cosmetology Board Practice Exam 2025 – Complete Study Guide

The standard pH level of hair is typically between 4.5 and 5.5. This slight acidity helps maintain the integrity of the hair structure and the health of the scalp. Hair's natural acidic environment is essential for ensuring that the cuticles (the outermost layer of the hair) remain closed and tight, which can reduce moisture loss and keep the hair smooth and shiny.

When products are formulated for hair care, having the right pH balance is crucial. Formulas that fall between 4.5 and 5.5 are designed to align with the hair's natural state, promoting better absorption and minimizing damage. Hair that is exposed to products with significantly higher pH levels (more alkaline) can lead to raised cuticles, resulting in frizz, breakage, and overall compromised hair health.

Understanding the pH level of hair is vital for cosmetologists and hair care professionals, as it influences how products should be used and how they interact with the hair.