Probiotics are beneficial bacteria and yeast that means that are all working positively for your digestive system. Our gut system should have enough beneficial bacteria for better digestion and fight against pathogens that are all germs which cause the disease.
Most of antibiotics replaced by probiotics. Regular probiotic supplement imrove the immune system and digestion process. Common probiotics Lactobacillus sp,its the one you'll find in curd and other fermented foods. Yeast also important probiotic which appears to help fight diarrhea and other digestive problems.