Different types of hair loss can be caused by hormones, stress, autoimmune disorders, illness, or nutritional deficiencies, and can be treated with medication, nutritional supplements, or hair transplantation.
33 citations
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January 2000 in “Acta Oto-Laryngologica” Epidermal growth factor increases extra hair cells in newborn rat ears.
Baldness is often hereditary and linked to male hormones, becoming noticeable when half the hair is lost.
2 citations
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January 1986 in “PubMed” PIXE is an effective method to analyze hair's elemental composition.
January 1996 in “Springer eBooks” 
ARHGEF3 is essential for proper hair follicle development.
49 citations
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April 2010 in “International Journal of Cosmetic Science” Hair ages as the cuticle wears down, especially beyond 1 meter from the root, affecting its strength and shine.
30 citations
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March 1996 in “British Journal of Dermatology” 
14 citations
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June 2022 in “BMC genomics” Key genes crucial for sheep hair follicle development were identified, aiding fine wool breeding and human hair loss research.
June 2023 in “Brazilian Journal of Health Review” Common baldness is a hereditary condition that can be treated with medications or surgery to prevent progression and improve self-esteem.