8 citations,
January 2020 in “Skin Pharmacology and Physiology” Caffeine improves hair growth, thickness, and reduces shedding.
153 citations,
October 2012 in “Skin Pharmacology and Physiology” Caffeine in cosmetics may reduce cellulite, protect skin, and stimulate hair growth, but more research is needed on its use and effects.
2 citations,
January 2012 in “International Journal of Trichology” Coffee and tea might help hair growth in balding individuals, but side effects and alternative uses are being considered.
12 citations,
May 2013 in “International Journal of Dermatology” Ethosomes improve black tea extract absorption in hair dye.
182 citations,
December 2007 in “BJCP. British journal of clinical pharmacology/British journal of clinical pharmacology” Hair follicles significantly increase the speed and amount of caffeine absorbed through the skin.