This study found that Polygonum multiflorum radix ethanol extract may promote melanin synthesis, potentially helping to turn gray hair back to black by enhancing antioxidant activity and increasing tyrosinase expression.
14 citations
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April 2005 in “Experimental Dermatology” This study found that stressed dermal fibroblasts significantly increased dopa oxidase activity in melanocytes from hair, skin, and eyes, suggesting the involvement of fibroblast-derived factors like basic Fibroblast Growth Factor.
26 citations
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September 2018 in “Neurobiology of Disease” This study found that both finasteride and dutasteride significantly reduced L-DOPA-induced dyskinesia in a rat model of Parkinson's disease, with dutasteride showing greater effectiveness at lower doses.
27 citations
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August 2006 in “Laboratory Investigation” In this study, the combination of SCF and ET-1 was found to significantly enhance skin pigmentation and melanin content in human skin xenografts on SCID mice compared to either treatment alone.
7 citations
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August 2013 in “Experimental and Therapeutic Medicine” In this study, the researchers optimized a method for culturing melanocyte precursors from hair follicles and found that 1,25-dihydroxyvitamin D3 significantly promotes their differentiation and melanin synthesis.