What is the ideal pH range for hair and scalp health?

The ideal pH range for hair and scalp health is between 4.5 and 5.5. This slightly acidic range is critical for maintaining the natural balance of the hair and scalp. The acidity helps to maintain the integrity of the hair cuticle, which is the outer layer that protects the inner structure of each hair strand. When the pH is within this range, it helps to keep the hairs smooth and minimizes frizz, as well as preventing damage and breakage.

Additionally, this pH range supports the scalp's natural barrier function, which can protect against pathogens and excessive oil production. Products formulated within this pH range are less likely to disrupt the scalp's natural oils and microbiome, making them more effective and gentle for regular use.

If the pH is outside of this ideal range, particularly higher (more alkaline), it can lead to issues such as cuticle lifting, increased porosity, and damage to the hair structure. Alternatively, a significantly lower pH can cause excessive dryness and irritation to the scalp. Therefore, maintaining products and practices within the pH range of 4.5 to 5.5 is crucial for promoting healthy hair and scalp.