Based on the microbiological and biochemical characteristics of a novel strain of lactic acid bacteria emerged in the fermentation process of a vegetable and brown sugar fermentation beverage, a better immunostimulant and a health care food, a pharmaceutical composition and the like including the immunostimulant are provided. Disclosed are an isolated bacterial strain of Lactobacillus kosoi 10H deposited under the accession number NITE BP-02811, and a composition comprising the isolated bacterial strain or a culture product thereof.
