What is the natural pH of hair?

The natural pH of hair typically falls within the range of 4.5 to 5.5, with 5.0 being a common reference point. This mildly acidic pH level is important because it helps to maintain the integrity of the hair structure and the scalp. A slightly acidic environment helps to keep the hair cuticles closed, which promotes shine and reduces frizz. This pH also supports the scalp's natural barrier function, protecting it from environmental damage and keeping bacteria and fungi at bay.

Products designed for hair care, such as shampoos and conditioners, often aim for a pH level that aligns closely with this natural range to ensure compatibility with the hair and scalp. If hair products have a much higher pH (alkaline), it can cause the hair cuticle to lift, leading to potential damage and moisture loss. Thus, understanding and maintaining the natural pH of hair is crucial for achieving healthy, well-maintained strands.