March 2024 in “Journal of Evidence-Based Integrative Medicine” This study found that a hair tonic containing 1% teak leaf extract significantly increased hair growth and user satisfaction in men with androgenic alopecia after 24 weeks, without causing adverse effects, and was comparable to the standard treatment, minoxidil.
January 2024 in “http://isrctn.com/” Teak leaf extract hair tonic was tested for hair growth and safety.
March 2025 in “Molecules” This study explored the in vitro skin penetration of two compounds from Tectona grandis leaf extract used for standardization and found that compound 1 penetrates more efficiently than compound 2, especially with a propylene glycol enhancer.
February 2024 in “Trends in Sciences” This study examined the stability of two 5α-reductase inhibitors in Tectona grandis extracts, finding that they are more stable in acidic environments and degrade rapidly under heat and light unless protected, suggesting the need for careful storage when developing anti-hair loss medications.
July 2025 in “JURNAL BIOLOGI TROPIS” In this animal study, the researchers reported that a shampoo containing 2.5% teak leaf extract and 0.30% virgin coconut oil significantly increased hair growth rate and reduced hair loss in mice, suggesting potential benefits for addressing hair loss.