A composition comprising: a flavan compound that is at least one of a proanthocyanidin and catechins; a protein degradation peptide having an average molecular weight of less than 7,000; and a peptide or protein having an average molecular weight of not less than 7,000. The composition does not impair effects of the flavan compound to the body. Furthermore, when the composition is formulated in a liquid preparation, neither coagulation-precipitation attributable to the nature of the flavan compound, nor coagulation-precipitation with the high molecular weight peptide or protein which is attributable to the protein-constricting property of the flavan compound is caused.