| 摘要 |
A skin agent for external use and a cosmetic agent are provided, by transdermal administration of which expected actions and effects of ubiquinone derivatives, salts thereof, ubiquinones and ubiquinols are effectively obtained. The skin agent for external use includes a ubiquinone derivative or a salt thereof as an active ingredient. The ubiquinone derivative is represented by the formula (1): wherein R1 and R2 are each a hydrogen atom or a phosphoric group, at least one of R1 and R2 is a phosphoric group, and n is an integer in the range of 1 to 9.
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