| abstract |
PROBLEM TO BE SOLVED: To provide an effect of promoting collagen production in dermal fibroblasts and to prevent or improve skin aging symptoms such as generation of skin wrinkles, decreased elasticity, rough skin, dullness and sagging. A skin external preparation which is effective for skin and can also exert a moisturizing effect. SOLUTION: In a skin external preparation, sericin and a hydrolyzate thereof are used in combination with a yeast extract, a yeast degradation product, and a yeast degradation product extract. The sericin hydrolyzate is obtained by partially hydrolyzing sericin contained in silkworm cocoons or raw silk in an alkaline aqueous solution or by enzymatic treatment and eluted. The yeast degradation product can be obtained by autolyzing yeast, decomposing it with a protease, or hydrolyzing it with an acid. |