To provide a xanthone derivative having weak side effects and exhibiting excellent collagen-producing activity, and to provide a method for producing the xanthone derivative.

The xanthone derivative having weak side effects and exhibiting excellent collagen-producing activity has -10 mV to -700 mV oxidation-reduction potential. The derivative has a tripeptide consisting of cysteine, alanine and cysteine bonded to a hydroxy group of the xanthone by an ester bond. The cysteine, the alanine and the cysteine are peptide-bonded. The method for producing the derivative includes steps of adding soybean powder and Bacillus natto to a pericarp powder of mangosteen or a Salacia powder, fermenting the resultant mixture, filtering the fermented liquid, and reducing the resultant filtrate using an alkali, the main steps therein being the fermentation step and the alkali reduction step.