The present invention provides an agent for regulating the expression level of a clock gene, which is rich in dietary experience, high in safety, easy to obtain, and excellent in processability. An olfactory pin, 3,4-DHPEA-EA, and derivatives thereof, and salts thereof as an active ingredient. The expression level of the clock gene of the present invention can regulate the expression levels of the Per1 gene and the Bmal1 gene in reverse phase, thereby synchronizing the expression rhythm of the Per gene and the Bmal gene to the normal phase.
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