October 2001 in “Science news” Understanding hair growth and loss is complex, involving genetic and molecular factors.
research Hair
January 1983 in “Elsevier eBooks” Hair grows from living roots, is made of dead keratin, and goes through growth, rest, and shedding stages.
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January 1954 in “Physiological Reviews” Hair growth is cyclic and influenced mainly by local factors.
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October 1988 in “Clinics in Dermatology” Hormones, nutrition, and seasonal changes regulate hair growth cycles, with androgens extending growth phases and factors like aging and malnutrition affecting hair loss and thinning.
September 2004 in “PubMed” Hair grows in three stages: growing, transition, and resting.