The purpose of the present invention is to provide a means for suppressing decrease of photostability of vitamin B2 or a salt thereof, namely decomposition of vitamin B2 or a salt thereof by light in a liquid preparation for internal use containing vitamin B2 or a salt thereof and vitamin E or a derivative thereof. A liquid preparation for internal use according to the present invention is characterized by being obtained by blending vitamin B2 or a salt thereof, vitamin E or a derivative thereof, and propyl gallate.
