PROBLEM TO BE SOLVED: To discover an ingredient having an anti-obesity action, a cyclic AMP phosphodiesterase activity inhibitory action, a dipeptidyl peptidase IV activity inhibitory action, anti-aging action, a hair-growing action, an anti-androgen action, a skin-whitening action, or an anti-inflammatory action from among compounds derived from a natural product and to provide an anti-obesity agent, a cyclic AMP phosphodiesterase activity inhibitor, a dipeptidyl peptidase IV activity inhibitor, an anti-aging agent, a hair-growing agent, an anti-androgen agent, a skin-whitening agent, or an anti-inflammatory agent, which contains the ingredient as an active ingredient.SOLUTION: An anti-obesity agent, a cyclic AMP phosphodiesterase activity inhibitor, a dipeptidyl peptidase IV activity inhibitor, an anti-aging agent, a hair-growing agent, an anti-androgen agent, a skin-whitening agent, and an anti-inflammatory agent contain dihydroferulic acid as an active ingredient. The dihydroferulic acid is blended in the skin cosmetic, the hair cosmetic and the food and drink of the present invention.SELECTED DRAWING: None
