May 2024 in “Jurnal Penelitian Farmasi dan Herbal” Green tea leaf extract at 7.5% concentration effectively promotes hair growth, similar to minoxidil.
10 citations
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January 2013 in “International Journal of Research in Pharmaceutical Sciences” The herbal microemulsion was safe and more effective at controlling hair loss than a standard product.
2 citations
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January 2000 in “Elsevier eBooks” 
December 2023 in “Journal of dispersion science and technology” The natural shampoo made from Gleditsia sinensis Lam and other ingredients showed good foaming, cleaning, and protective properties.
January 1996 in “Springer eBooks” 
18 citations
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December 2016 in “Phytomedicine” Curcuma aeruginosa essential oil effectively reduces hair growth and lightens underarm skin.
Hibiscus leaf extract in hair tonic promotes hair growth effectively.
June 2023 in “Zenodo (CERN European Organization for Nuclear Research)” 
33 citations
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June 2007 in “International Journal of Pharmaceutics” The conclusion is that measuring how drugs partition into artificial sebum is important for predicting their delivery into hair and sebaceous follicles, and it provides better information than traditional methods.
May 2023 in “Health science reports” Coloring shampoos for gray hair may cause gene mutation, reproductive issues, and skin damage, needing stricter regulation and expert consultation.