Problem to be solved. To provide an agent and a composition for improving intrauterine bacterial flora, and a method for determining whether intrauterine bacterial flora is improved or normalized. Solution. Provides is an agent for improving intrauterine bacterial flora containing lactoferrin or a salt thereof as an active ingredient. Also provided is an agent for improving intrauterine bacterial flora containing lactoferrin or a salt thereof as an active ingredient, wherein a Lactobacillus occupancy in intrauterine bacterial flora is normalized to 70% or more.
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