To provide a promoter for expression of keratin 5 gene, keratin 10 gene, loricrin gene, and transglutaminase gene.SOLUTION: The present invention provides a keratin 5 gene expression promoter containing phytic acid as an active ingredient; a keratin 10 gene expression promoter containing phytic acid as an active ingredient; a loricrin gene expression promoter containing phytic acid as an active ingredient; a transglutaminase gene expression promoter containing phytic acid as an active ingredient.SELECTED DRAWING: None
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