| abstract |
PROBLEM TO BE SOLVED: To provide an extract having a vitamin D-like action useful for improving the condition of skin aging and/or rough skin, and a skin external preparation containing the extract. SOLUTION: A vitamin D-like agent containing a peony flower extract as an active ingredient. An external preparation for skin containing the vitamin D-like agent. Further, an evaluation method for evaluating the skin aging prevention/improvement effect and/or rough skin prevention/improvement effect of a test substance using vitamin D as an index, and the skin aging and/or skin roughness as the vitamin D concentration in blood as an index Evaluation method to evaluate. [Selection diagram] Figure 1 |