TLDR Vitamin B12 may promote hair growth by affecting certain cell processes.
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Cited in this study
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27 citations
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November 2005 in “Archives of Dermatological Research” Choosing hair follicles at the same growth stage leads to more consistent hair growth experiments.
94 citations
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February 1994 in “The journal of investigative dermatology/Journal of investigative dermatology” EGF makes hair follicles grow longer but stops hair production.