May 2023 in “Jurnal farmasi sains dan praktis” The hair tonic with cinnamon oil and coconut oil was stable and caused very mild irritation.
December 2022 in “Journal of Tropical Pharmacy and Chemistry” The hair tonic made from oil palm leaf extract is very effective in preventing hair damage from the sun.
September 2023 in “Jurnal MIPA (edisi elektronik)” Lime extract can be used to make a stable hair tonic with beneficial compounds.
May 2024 in “Jurnal Penelitian Farmasi dan Herbal” Green tea leaf extract at 7.5% concentration effectively promotes hair growth, similar to minoxidil.
December 2022 in “Proceeding Bengkulu International Conference on Health” Celery extract hair gel at 5% concentration is best for making hair gel.