What does the pH scale measure in relation to hair and skin care products?

The pH scale is a crucial measurement in hair and skin care products because it assesses the acidity or alkalinity of a substance. It ranges from 0 to 14, with values below 7 indicating acidity, a value of 7 neutral, and values above 7 indicating alkalinity. This is important in cosmetology because the pH of hair and skin can influence how products interact with them.

For hair care products, maintaining a slightly acidic pH (around 4.5 to 5.5) is vital as it helps to keep the cuticle layer of the hair smooth and intact, preventing damage and making the hair shiny and manageable. Similarly, skin products also benefit from a balanced pH that aligns with the natural pH of the skin, supporting its barrier function and overall health. An understanding of pH assists cosmetology professionals in selecting the right products for various hair and skin types, ensuring both safety and effectiveness.