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Biotin supplements don't consistently help hair growth in alopecia unless there's a deficiency.
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March 2015 in “Journal of Microbiology and Biotechnology” Ultra-high molecular weight poly-γ-glutamic acid may help promote hair growth.
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January 2022 in “Social Science Research Network” Pyruvate Kinase M2 helps hair grow by linking energy production and a key hair growth pathway.
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August 2014 in “OhioLink ETD Center (Ohio Library and Information Network)” Alkylated keratin from human hair can help deliver growth factors for bone healing.
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