What is the pH range of hair?

The pH range of hair is typically between 4.5 and 5.5. This slightly acidic pH helps maintain the health and structure of the hair. Hair is composed of keratin, a protein that can be affected by pH levels. A pH level within this range ensures that the cuticle, which is the outer layer of hair strands, remains closed and tightly bound, which is essential for maintaining moisture and preventing damage.

When hair care products are formulated to have a pH that aligns with this range, it helps in preserving the hair's natural integrity. Products that are too alkaline (higher than this range) can lift the cuticle, leading to frizz and increased susceptibility to damage, while products that are too acidic may not cleanse the hair effectively. Understanding the appropriate pH range is crucial for anyone in the field of cosmetology, as it informs decisions on product selection and hair care treatment protocols.