An object of the present invention is to increase the rate at which lignan-class compounds are absorbed into the body, namely, to provide fast-acting lignan-class compounds. Provided is an oil-in-water emulsion which comprises a water phase and an oil phase comprising at least one kind of lignan-class compounds dissolved therein and being emulsified in the water phase, wherein the oil droplets which serve as a dispersion phase in the emulsion are made finer by high-speed agitation or other method so that their average particle size is 1000 nm or smaller, preferably 500 nm or smaller, and more preferably 300 nm or smaller, whereby the rate at which lignan-class compounds are absorbed into the body is improved to impart immediate action.本發明之課題在於提供一種加速木聚糖類化合物之體內吸收速度，亦即具有即效性之木聚糖類化合物。；本發明之含木聚糖類化合物的組成物，其係使木聚糖類化合物之一種以上溶解於油脂之油相於水相中乳化之水中油滴型乳化液中，使分散相之油滴的粒徑藉高速攪拌等進行微粒化，以使平均粒徑調製成1000nm以下，宜為500nm以下，更宜為300nm以下，其可提昇木聚糖類化合物之體內吸收速度並賦予即效性。
