The present invention relates to a Lactobacillus reuteri CBG-C15 strain producing conjugated linoleic acid (CLA); to a microorganism formulation for producing conjugated linoleic acid, a capsulated formulation, functional food, nutrient tonics, a composition for animal feed, and a pharmaceutical composition, comprising the strain or a culture medium thereof as an active ingredient; and to a method for producing conjugated linoleic acid comprising a step of culturing the strain. The strain has excellent acid resistance, bile resistance, and antibiotic resistance.
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