April 2019 in “Journal of Investigative Dermatology” Testosterone affects androgen receptors and lipid storage in cells, while DHEA does not convert to testosterone or affect these receptors in the same way.
215 citations
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September 2003 in “Journal of Biological Chemistry” Vitamin D receptor and hairless protein are essential for hair growth.
The document's conclusion cannot be provided because the document is not available or cannot be read.
February 2026 in “Zenodo (CERN European Organization for Nuclear Research)” February 2026 in “Zenodo (CERN European Organization for Nuclear Research)” 166 citations
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July 1999 in “American Journal Of Pathology” The hairless (hr) gene is essential for normal hair follicle function and its mutation leads to hair loss.
November 2021 in “World Family Medicine Journal /Middle East Journal of Family Medicine” Thyroid hormone levels in children are linked to growth hormone and can be affected by diabetes in Riyadh, Saudi Arabia.
June 2023 in “Zenodo (CERN European Organization for Nuclear Research)” November 2020 in “The American Pharmacists Association eBooks” 
15 citations
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October 2016 in “Journal of dermatological treatment” Proper hair care can prevent and stop hair breakage in people with acquired trichorrhexis nodosa.
April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology” DKK2 and SOSTDC1 together are necessary for the normal timing of the first regression phase in the hair growth cycle.
March 2015 in “Daehan boncho haghoeji/Daehan bonchohak hoeji” Haeae-tang helps hair grow in mice.
August 2021 in “Journal of the American Academy of Dermatology” The shampoo's ingredients' effect on a hair growth pathway in cells was tested, but the results are not given.
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January 2010 in “Springer eBooks” 
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August 2024 in “Cureus” 2 citations
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July 1999 in “Hair transplant forum international” 
March 2024 in “Cytologia” LncRNA MTC boosts growth of goat skin cells, improving cashmere quality.
September 2002 in “Hair transplant forum international” The document's conclusion cannot be provided because the content is not available.
January 2002 in “Hair transplant forum international” The document's conclusion cannot be provided because the content is not available.
85 citations
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May 1986 in “Journal of Investigative Dermatology” 78 citations
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October 2007 in “Journal of Investigative Dermatology” Delta1 is crucial for controlling skin cell growth and preventing tumors in mice.
December 2014 in “Journal of Biomedical Research” Recombinant thymosin β4 promotes blood vessel growth and reduces muscle damage.
October 2024 in “Journal of the Endocrine Society” Hashimoto's thyroiditis can sometimes change to Graves' disease, so patients need careful monitoring.
July 2005 in “Journal of the American Academy of Dermatology” 
December 2025 in “IP Indian Journal of Clinical and Experimental Dermatology” DNCB is more effective than betamethasone for hair regrowth but has more side effects.
Shh and Dhh affect skin development and can cause tumors, while Ihh does not.
Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
2 citations
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July 1994 in “Journal of Dermatological Science” Grafted human scalp samples on mice can produce human hair, useful for studying hair genetics.