Approximately what percentage of hair is made up of protein?

Hair is predominantly composed of a protein called keratin, which is an essential structural component. Approximately 90% of hair's composition is indeed made up of protein. This high protein content plays a vital role in providing the hair with strength, resilience, and the ability to withstand various environmental factors. Keratin not only contributes to the physical structure of hair but also influences its appearance and texture. Understanding this protein composition is crucial for barbers, as it helps inform their approach to hair care, treatments, and styling techniques, ensuring that the health and integrity of clients' hair is maintained.