In this experimental study, hibiscus leaf extract at a 30% concentration showed effectiveness in promoting hair growth on guinea pigs, with measurable increases in hair length and weight by the 21st day.
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October 2015 in “Interest : Jurnal Ilmu Kesehatan” In this study, both gel and microemulsion formulas containing waru leaves and Java Tamarind extracts were found to have similar in vivo hair growth activity in rabbits.
March 2022 in “Journal of drug delivery and therapeutics” Sea hibiscus leaf extract at 30% concentration in a hair tonic significantly increased hair growth in guinea pigs.
This study found that creambath preparations with waru leaf extract accelerated hair growth in New Zealand White rabbits, though none matched the positive control; the 37.5% concentration increased hair weight effectively.
April 2019 in “Agriculture and natural resources”