4 citations
,
October 2017 in “International Journal of Applied Pharmaceutics” This study found that hair tonics with 5% and 10% licorice extract promoted hair growth in rabbits similarly to 2% minoxidil and were generally safe, although they caused mild eye irritation at the 2.5% concentration.
1 citations
,
June 2018 in “Pharmaciana” In this study, researchers developed a hair tonic using 7.5% Aloe vera extract and 2.5% licorice extract, finding that the formula with 15% ethanol showed optimum activity by promoting hair growth and increased hair weight in rabbits over 28 days.
This study found that gels containing glycyrrhizic acid and aqueous Glycyrrhiza glabra extract significantly reduced underarm hair growth in terms of area, thickness, length, and number compared to their gel bases.
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.
December 2022 in “Journal of Tropical Pharmacy and Chemistry” This study evaluated a hair tonic formulated from oil palm leaf extract, finding it demonstrated very strong antioxidant activity and could prevent hair decolorization from sun exposure, with effective concentrations ranging from 25 to 200 ppm.