A clinically proven formula that works like a prebiotic, probiotic, symbiotic and postbiotic Probiotic-3 is a unique combination of three proven strains: Enterococcus faecium T-110, Clostridium butyricum TO-A, and Bacillus subtilis TO-A. These strains are clinically studied to improve gut flora, produce beneficial short-chain fatty acids, enhance immunity, and reduce bloating or irregularity.