Takahashi, T., Kamiya, T., & Yokoo, Y. (1998). Proanthocyanidins from Grape Seeds Promote Proliferation of Mouse Hair Follicle Cells in Vitro and Convert Hair Cycle in Vivo. Acta Dermato-Venereologica, 78(6), 428–432. https://doi.org/10.1080/000155598442719