What is the pH level range for hair products?

The pH level range of 4.5 to 5.5 is considered ideal for hair products because it closely matches the natural pH of the scalp and hair, which is typically slightly acidic. This pH range helps maintain the integrity of the hair cuticle, keeping it smooth and reducing the risk of damage. Products formulated within this range help to ensure that hair remains healthy, manageable, and less prone to frizz or breakage.

When products fall outside this range, they can disrupt the natural balance of the hair and scalp. For example, products that are too alkaline can raise the cuticle of the hair, leading to dryness and damage, while overly acidic products can lead to scalp irritation. Therefore, the preference for a pH range of 4.5 to 5.5 serves to promote overall hair health and maintain the function of hair's natural oils and protective barriers.