December 2021 in “Ad-Dawaa' Journal of Pharmaceutical Sciences” Green tea and celery leaf extracts in hair tonic promoted hair growth in guinea pigs, with the best results at specific concentrations.
December 2018 in “Journal of Medicinal and Aromatic Plant Sciences” Some plants like Eclipta alba, Nardostachys jatamansi, and Rumex japonicus may help hair growth.
June 2018 in “International journal of trend in scientific research and development” The review explains how hair products work and the science of different hair types to help improve hair care research.