| 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 (maintaining skin firmness and elasticity), preventing and treating arthritis, etc., and initial treatment of burns. Provided is an external preparation for skin that can maintain the firmness and elasticity of the skin to prevent wrinkles and maintain a moist, youthful skin condition by being incorporated into an external preparation. SOLUTION: A hyaluronic acid production promoter containing, as an active ingredient, an extract of a plant belonging to the family Rutaceae (Rutaceae), in particular, a plant belonging to the genus Citrus. |