Dark Hair – Trusted & Legit

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

: Dark hair results from high levels of eumelanin produced by melanocytes in the hair follicle bulb. The color of human hair is determined by

: Most individuals with dark hair possess two functional copies of the MC1Rcap M cap C 1 cap R Evolutionary Context : Dark hair results from high

gene, which signals melanocytes to produce eumelanin instead of pheomelanin.

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

Evolutionary biologists suggest that dark hair and skin evolved as an adaptation to intense solar radiation, particularly in equatorial regions. Biochemistry, Melanin - StatPearls - NCBI Bookshelf - NIH