What factor affects the pH level of hair products?

The pH level of hair products is crucial because it impacts the hair's health, appearance, and manageability. The correct answer focuses on how the ingredients in the formulation directly determine the pH level.

Each ingredient in a hair product can have its own inherent pH level, which, when combined with other components, influences the overall acidity or alkalinity of the product. For example, products containing more acidic ingredients, such as certain fruit extracts or citric acid, tend to lower the pH, while those with alkaline ingredients can raise it. The pH level of the product affects the hair cuticle's structure, influencing how well the product can penetrate the hair shaft and effectiveness in enhancing shine, reducing frizz, or maintaining moisture.

Understanding the relationship between ingredients and pH is essential for cosmetologists to select the appropriate products for different hair types and conditions, ensuring optimal results for their clients.