What part of the hair is responsible for its color?

The color of hair is primarily determined by the presence of melanin, which is a pigment produced in the hair follicles. Melanin comes in different forms and concentrations, leading to the various natural hair colors, ranging from black and brown to blonde and red. The quantity and type of melanin produced by melanocytes in the hair follicle directly influence the final color of the hair shaft as it grows.

While other components of hair, such as protein and keratin, contribute to its structure and physical properties, they do not play a role in determining color. The protein in the hair shaft supports its strength and resilience, and keratin provides structure, but neither affects pigmentation. The blood supply in the scalp does contribute to overall hair health and growth, but it does not involve the pigmentation process. Thus, melanin in the hair follicle is the critical factor when it comes to hair color.