51 citations
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November 1998 in “The journal of investigative dermatology/Journal of investigative dermatology” Beard cells, unlike scalp cells, produce growth factors in response to testosterone, which may explain differences in hair growth.
April 2024 in “Journal of endocrinological investigation” Topical minoxidil helps transgender individuals assigned female at birth grow more facial hair.
March 2024 in “Molecules/Molecules online/Molecules annual” Enzymatically extracted bear oil has more unsaturated fats and significantly increases hair growth in mice.
February 2013 in “Journal of the American Academy of Dermatology” Certain gene variations may increase the risk of alopecia, and platelet-rich plasma treatment can improve hair density in those with hair loss; a rare case of facial Becker's nevus was linked to uneven beard growth.
30 citations
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March 2017 in “PLoS ONE” Sulfur slightly improved diet estimates for grizzly bears, but hair growth timing varied, affecting results.