December 2021 in “Ad-Dawaa' Journal of Pharmaceutical Sciences” This study concluded that hair tonic formulations using extracts of green tea leaves, celery leaves, or their combination can effectively promote hair growth in guinea pigs, with the fastest growth seen using a 2.5% green tea to 7.5% celery leaf extract ratio.
August 2023 in “Skin Research and Technology” In this clinical trial, oral consumption of a persimmon leaf extract-containing complex significantly increased hair density and thickness over 24 weeks compared to a placebo, although improvements in hair gloss were not statistically significant.
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August 2022 in “Korean journal of medicinal crop science/Han-gug yagyong jagmul hag-hoeji” This study investigated the antioxidant and anti-inflammatory effects of the plant extract BLH308 and its potential to reduce hair loss, showing significant antioxidant activity in vitro.
This study investigated whether combinations of green tea leaf and gotukola extracts could act as a hair growth stimulant but reports no definitive results on the most effective combination.
July 2019 in “Majalah Obat Tradisional” This study reported that a 4% water fraction of green tea leaf extract showed the most effective hair growth promotion in rabbits.