What does pH measure in relation to hair products?

pH measures the acidity or alkalinity of a product on a scale that typically ranges from 0 to 14. In the context of hair products, understanding the pH level is crucial because it affects how the product interacts with the hair and scalp. Hair and skin are slightly acidic, with a natural pH around 4.5 to 5.5. Products with a pH level that is too high (alkaline) can disrupt this balance, leading to damage or irritation, while products that are more acidic can help to close the cuticle of the hair, improving shine and manageability. Therefore, knowing the pH of hair products helps cosmetologists choose the right products for their clients based on their specific hair types and needs.