research Hair Growth-Promoting Effects of Rosehip (Rosa canina L.) Seed Oil in C57BL/6 Mice December 2023 in “Journal of Food Science and Nutrition” Rosehip Seed Oil may help hair grow by activating important growth pathways and increasing hair follicle size in mice.
research Cis-Element and Transcriptome-Based Screening of Root Hair-Specific Genes and Their Functional Characterization in Arabidopsis 188 citations, May 2009 in “Plant physiology” Researchers found 19 genes important for root hair growth in a plant called Arabidopsis.