Indiana State Beauty Practice Exam

Which of the following best describes the main function of keratin in hair?

1. Regulate moisture

2. Provide color

3. Give strength

4. Enhance shine

The correct answer is: Give strength

The main function of keratin in hair is to provide strength. Keratin is a fibrous structural protein that is a key component of hair, nails, and the outer layer of skin. Its unique structure contributes to the resilience and durability of hair strands, helping them resist damage and maintain their shape. While some might consider the role of keratin in terms of moisture regulation or shine enhancement, these aspects are more influenced by other factors, such as the hair's natural oils and overall health rather than the inherent properties of keratin itself. Keratin does not provide color, as hair color is primarily determined by the presence of pigments such as melanin. Therefore, recognizing keratin's primary role in fortifying the hair helps in understanding its importance in hair care and overall hair health.