47 citations
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July 1967 in “Science” Not eating enough protein can cause hair roots to shrink and lose color, and hair to become thinner.
13 citations
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March 2000 in “Veterinary Dermatology” Dogs have a skin condition like human pseudopelade, causing hair loss that doesn't improve with treatment.
13 citations
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January 1993 in “Archives of dermatological research” Human hair follicles can grow and stay healthy for up to 8 days in a lab setting.
1 citations
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December 2001 in “Linchuang pifuke zazhi” Some Chinese herbs can promote or inhibit hair growth.
20 citations
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November 1968 in “The Lancet” Potassium levels affect blood sugar and insulin during dialysis, and malnutrition changes children's hair roots.