"Guilty" of this fact is the massive accumulation of hydrogen peroxide that causes the gray color of hair.
This substance, known mainly as hydrogen peroxide (H202), is used in low concentrations for hair discoloration, before hair coloring. Some cells produce a reasonable amount of hydrogen peroxide, but along with age, the secretion is increased.
Researchers made the discovery while analyzing cell cultures of human hair follicles (saccate anatomical formations surrounding the hair root). Thus, they found that the accumulation of hydrogen peroxide is caused by reduction of an enzyme that breaks the hydrogen peroxide into water and oxygen.
To further complicate things, high levels of hydrogen peroxide destabilises, reaching to the disruption of the secretion of melanin in hair follicles. Melanin is the pigment responsible for hair color, skin and eyes. Bleaching effect of peroxide and diminution of melanin production are enatiling hair greying.
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