What is the significance of human hair’s keratin content?

The keratin content of human hair plays a crucial role in providing strength and resilience to the hair structure. Keratin is a fibrous protein that makes up the majority of the hair shaft, and its unique structure contributes to the overall durability and integrity of the hair. This strength enables hair to withstand various stresses such as styling, washing, and environmental factors without easily breaking or becoming damaged. Additionally, the presence of keratin helps maintain the elasticity of hair, allowing it to return to its original shape after being stretched or manipulated.

While keratin does contribute to some aspects of hair's structure and appearance, it is primarily recognized for its strength rather than for providing color, texture, moisture retention, or influencing growth rates. Each of these other factors, while important for overall hair health, is related to different components of hair and the surrounding environment, rather than the intrinsic properties of keratin itself.