The present invention addresses the problem of discovering a composition for internal use, with which it is possible to produce a satisfactory fat-reducing effect. Specifically, the present invention provides a composition for internal use containing a component (a): lactoferrin, and a component (b): fucoxanthin and/or a metabolyte thereof. The proportion of component (b)/component (a) is preferably 0.0001 to less than 0.3. The present invention also provides a body fat reduction promotor having component (a) and component (b) as effective components； a body fat reducing agent having component (a) and component (b) as effective components； an agent for lowering neutral lipids in the blood, having component (a) and component (b) as effective components； and an agent for lowering free fatty acids in the blood, having component (a) and component (b) as effective components.
