| abstract |
The present invention can provide orally administered agents, foods and drinks, feeds, food additives or feed additives for preventing or treating a dry state of the skin, which comprise hydroxyproline, an N-acyl derivative of hydroxyproline, especially an N-acetyl derivative, an N-propionyl derivative, an N-butyryl derivative, an N-isobutyryl derivative, or a salt thereof as an active ingredient. |