Dark Hair 【Verified – 2025】

The color of human hair is determined by the concentration and ratio of two types of melanin: (brown-black) and pheomelanin (red-yellow).

: Pigment synthesis begins with the amino acid L-tyrosine , which is converted by the enzyme tyrosinase into dopaquinone. In the absence of high sulfur levels (cysteine), this precursor polymerizes into the dark eumelanin. Evolutionary Context dark hair

The Biology and Perception of Dark Hair Dark hair—encompassing shades from deep brown to jet black—is the most prevalent hair color globally, appearing in approximately 90% of the human population. This dominance is the result of specific genetic pathways, biochemical processes, and evolutionary adaptations that have favored the production of dense pigments. Genetic and Biochemical Foundations The color of human hair is determined by

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