Abstract: Provided is a method for preventing the disturbance of vaginal bacterial flora during the menstrual period and improving the vaginal bacterial flora. One aspect of the present invention is a sanitary product carrying lactoferrin or a composition comprising lactoferrin and an auxiliary substance. Also provided is a kit comprising a sanitary product, and lactoferrin or the composition comprising lactoferrin and an auxiliary substance.

Abstract: The purpose of the present invention is to provide an agent for improving intrauterine bacterial flora, and a method for determining whether intrauterine bacterial flora has been improved or normalized. An aspect of the present invention is an agent for improving intrauterine bacterial flora that contains lactoferrin or a salt thereof as an active ingredient. Additionally provided are: an agent or composition for improving intrauterine flora or treating or preventing diseases caused by the imbalance of intrauterine bacterial flora, the agent or composition containing lactoferrin or a salt thereof; a method for treating or preventing diseases caused by imbalance of intrauterine bacterial flora, the method comprising administrating the agent or composition; and a method for determining whether intrauterine bacterial flora has been improved or normalized.