| abstract |
(57) [Problem] To provide a sustained moisturizing preparation having high stability, extremely high moisture content and extremely long lasting action of moisturizing action, and a skin external preparation containing the same. SOLUTION: The average molecular weight is 1800000-2200. It is a sustained moisturizing preparation containing 000 hyaluronic acid and its salts. An external preparation for skin containing the above-mentioned hyaluronic acid and salts thereof in a proportion of 0.0001 to 5% based on the total weight. Contains 1,2-pentanediol. Contains no preservatives. |