A growing number of products with probiotics
A growing number of products with probiotics are being promoted to improve GI function and immunity.
Probiotics contain strains of "friendly" gut microbes...Bifidobacterium, Lactobacillus, Saccharomyces, and others.
The idea is to recolonize the gut with good microbes and crowd out harmful ones. Probiotics might also stimulate the immune system.