| abstract |
(57) [Problem] To provide a hyaluronic acid production promoter which promotes hyaluronic acid production ability in humans. The hyaluronic acid production promoter is effective in preventing aging of human skin (e.g., maintaining skin elasticity and elasticity), preventing and treating arthritis, etc., and initially treating burns. Provided is an external preparation for skin which, when incorporated into an external preparation, can maintain skin scalability and elasticity, prevent wrinkles, and maintain a moist, youthful skin condition. A plant belonging to the genus Rosaceae, in particular, a plant belonging to the genus Sakura (Prunus), the genus Hawthorn (Crataegus), the genus Spiraea (Filipendula), the genus Rose (Rosa), or the genus Rubus (Rubus), or a plant thereof. A hyaluronic acid production accelerator containing a solvent extract, and a skin external preparation containing the accelerator. |