Q: How do the distinct antimicrobial mechanisms of Lactobacillus reuteri and Lactobacillus rhamnosus compare?

A: While L. reuteri produces reuterin—a potent broad-spectrum antimicrobial compound—to directly inhibit pathogens, L. rhamnosus (such as GG) excels at structural competitive exclusion by adhering tightly to intestinal mucus. Understanding these pathways clarifies the clinical choices when comparing Lactobacillus reuteri vs Lactobacillus rhamnosus for gut health and immune support.