May 2023 in “Jurnal farmasi sains dan praktis” In this research on cinnamon and virgin coconut oil hair tonics, F2 and F3 demonstrated stable physical properties and mild irritation potential, while formula 1 remained non-irritating but less stable regarding pH and viscosity.
June 2017 in “Asian journal of pharmaceutical and clinical research” This study found that a green tea extract gel was stable across various temperatures, did not cause eye irritation, and significantly increased eyelash growth compared to a placebo after two months of use in human volunteers.
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January 2015 In this study, gel containing apigenin and celery herb extract was observed to effectively stimulate hair growth and did not cause skin irritation in male Sprague-Dawley rats.
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August 2024 in “International Journal of Applied Pharmaceutics” This study found that a hair tonic containing 40% broccoli stalks extract was more effective in promoting hair growth in male white rats compared to lower concentrations, while also maintaining stable physical characteristics and safety during testing.
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August 2017 in “Asian Journal of Pharmaceutical and Clinical Research” The 1% ethyl acetate fraction ethosomal gel from Nothopanax scutellarium leaves promotes hair growth but can mildly irritate the skin.