May 2026 in “Jurnal Riset Kefarmasian Indonesia” Robusta coffee beans have high caffeine content, useful for products like hair growth stimulants.
Cinchona succirubra extract with caffeine reduces hair loss and strengthens hair.
April 2023 in “Journal of Investigative Dermatology” Cinchona succirubra extract with caffeine improves hair growth and reduces hair loss.
December 2020 in “Journal of Cosmetic Science” The caffeine content in anticellulite gels is 0.7-1.7% and in hair-care products is about 1.0%.
Red clover and caffeine both promote hair growth, but combining them doesn't enhance the effect.