| abstract |
(57) [Summary] [Object] To find a new component capable of inducing the production of cyclic AMP, and to use this as an active ingredient of an external preparation, thereby having an action such as a gray hair preventing action. To provide. The present inventors have determined that geraniol, nerol, citronellol, citronellal, citral, octanal, octanol, menthol, thymol and eugenol, in particular, geraniol, nerol, citronellol and citronellal have excellent cyclic AMP inducing action, and With these as active ingredients, It has been found that a cyclic AMP inducer is provided, and the above-mentioned problems can be solved by using the cyclic AMP inducer as, for example, a tyrosinase activity promoter or a gray hair inhibitor. |