What is the pH range of human hair?

The pH range of human hair is typically between 4.5 and 5.5. This slightly acidic pH is important because it helps to maintain the integrity of the hair cuticle. When the pH is within this range, it contributes to the healthiness of the hair, enabling it to retain moisture and ensuring that the cuticle lies flat. This aids in the hair's overall appearance, texture, and strength.

Using products that match this pH range is crucial for hair care, as it can help avoid issues such as frizz and damage. Products that are too alkaline can raise the hair cuticle, leading to dryness and possible breakage, while products that are too acidic can cause the hair to become overly compacted. Therefore, maintaining hair care routines that consider this pH level is essential for preserving the quality and resilience of human hair.