A Maillard reaction product-decomposing agent as well as a beverage composition, a food composition, a functional food, a cosmetic, a supplement, a quasi drug, or a pharmaceutical product that contains the agent as an active ingredient. A Maillard reaction product-decomposing agent containing an extract of fennel as an active ingredient. A beverage composition, a food composition, a functional food, a cosmetic, a supplement, a quasi drug, or a pharmaceutical product that contains, as an active ingredient, a Maillard reaction product-decomposing agent containing an extract of fennel as an active ingredient.
