Naturally found in the intestines, Lactobacillus gasseri is an extremely acid-resistant probiotic that has been researched for its potential to support weight loss and healthy abdominal fat. Because it's acid-resistant, L. gasseri isn't destroyed by the acidic stomach environment and is able to colonize the small instestines where it can have the greatest benefits. Studies also suggest that L. gasseri can support the immune system, specifically by supporting a healthy response to allergens.