Hair color

Hair color is a characteristic of human hair that depends on the levels and types of two types of melanin: eumelanin and pheomelanin. Generally, if more eumelanin is present, the color of the hair is darker; if less, the hair is lighter. Levels of melanin can vary over time causing a person's hair color to change, and it is possible to have hair follicles of more than one color on the same person. Natural hair color can be black, brown, blond, red, or white.

Genetics of Hair Color

The genetics of hair color are complex and not fully understood. Genes associated with hair color are primarily located on the chromosomes. The most important gene that determines human hair color is the MC1R gene, which is responsible for the production of the melanocortin 1 receptor, which in turn influences the amount of melanin produced by melanocytes. Variations in the MC1R gene can lead to a wide range of hair colors.

Determinants

Several factors contribute to the natural color of hair, including genetic makeup, hormonal changes, and environmental factors. For example, more exposure to sunlight can lighten hair color. Certain medical conditions and medications can also affect hair color.

Hair Color and Aging

As individuals age, hair color can change as the pigment cells in the hair follicle