Kentucky Cosmetology State Practice Exam

The ideal pH range for hair products is typically between 4.5 and 5.5. This range is slightly acidic, which aligns with the natural pH of hair and the scalp. Maintaining this pH level is crucial for several reasons.

First, products within this pH range help to preserve the integrity of the hair cuticle, which can become damaged and lifted if exposed to higher pH levels. When the pH is higher (more alkaline), it can cause the cuticle to open up, leading to frizz, tangling, and more susceptibility to damage from environmental factors and styling processes.

Second, using products with a pH that is too high can disrupt the scalp’s natural barrier, potentially leading to dryness, irritation, and an imbalanced microbiome. This can affect the overall health of both the hair and the scalp.

Thus, hair products formulated with a pH between 4.5 and 5.5 are ideal as they promote healthy hair and scalp conditions while helping to maintain moisture balance and prevent damage.