It is an extract obtained from the leaf stem of Watercress, Nasturtium officinalis R. Brown (Cruciferae), a hair growth material focuses on factors involved in organ development and tissue regeneration called "R-spondin1". Because the hair growth effect that is promoting the secretion of "R-spondin1" from hair papilla cells and the hair loss suppression effect that is suppressing the production of the hair loss factor DKK1 functioning in androgenetic alopecia were confirmed, it is recommended not only for men but also for women's hair loss measures.