What is the proper pH range for hair?

The proper pH range for hair is 4.5 to 5.5. This slightly acidic range is ideal because it helps maintain the hair's natural structure and health. The acidity of this pH level plays a crucial role in keeping the cuticle layer (the outermost protective layer of the hair) closed and tight, which helps to enhance shine, smoothness, and protect the hair from environmental damage. When hair is within this pH range, it feels softer and more manageable.

When hair products are used that are too alkaline (above the pH range of 5.5), they can raise the cuticle layer, making the hair more porous and susceptible to dryness, damage, and color fading. Conversely, if the pH is too low (below 4.5), it could lead to irritation of the scalp and a more tightly closed cuticle, which can also create issues with styling and absorption of conditioning products.

Understanding the proper pH range for hair is vital for stylists to recommend products and treatments that will maintain hair health and ensure optimal results.