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2. Greying of hair - Wikipedia

   en.wikipedia.org/wiki/Greying_of_hair

   Grey or white hair is not caused by a true grey or white pigment, but is due to a lack of pigmentation and melanin. The clear hairs appear as grey or white because of the way light is reflected from the hairs. The change in hair colour occurs when melanin ceases to be produced in the hair root and new hairs grow in without pigment.

3. The Real Reasons Hair Turns Gray, According to Dermatologists

   www.aol.com/real-reasons-hair-turns-gray...

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4. Premature greying of hair - Wikipedia

   en.wikipedia.org/wiki/Premature_greying_of_hair

   This overproduction causes depletion of the melanocyte stem cells which are required to produce melanin, the pigment responsible for hair color. [ 2 ] Premature greying of hair has been observed with greater frequency among certain families, suggesting a familial predisposition for the condition.

5. Melanin - Wikipedia

   en.wikipedia.org/wiki/Melanin

   The phenotypic color variation observed in the epidermis and hair of mammals is primarily determined by the levels of eumelanin and pheomelanin in the examined tissue. In an average human individual, eumelanin is more abundant in tissues requiring photoprotection , such as the epidermis and the retinal pigment epithelium . [ 4 ]

6. Summer sun can lead to gray hair — here's how to prevent it

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   How sunlight causes gray hair Sun damage contributes to the graying of hair at the molecular level, Dr. Michelle Henry, a board-certified dermatologist in New York City, tells TODAY.com.

7. Copper deficiency - Wikipedia

   en.wikipedia.org/wiki/Copper_deficiency

   Copper deficiency, or hypocupremia, is defined as insufficient copper to meet the body's needs, or as a serum copper level below the normal range. [1] Symptoms may include fatigue, decreased red blood cells, early greying of the hair, and neurological problems presenting as numbness, tingling, muscle weakness, and ataxia. [2]