Lactobacillus plantarum is a probiotic strain commonly found in fermented foods like sourdough and kimchi. L. plantarum is a hardy bacterial strain that has been shown to successfully transit through the digestive system without getting destroyed by the high-acid environment of the stomach. L. plantarum has been studied for its potential immunostimulating effects, as well as for its potential to support a strong intestinal wall. Studies suggest that taking L. plantarum may ease abdominal symptoms of IBS.