 Dr. O'Hara's award-winning formula contains a prebiotic blend of fruits and vegetables, which are naturally fermented with 13 strains of live probiotic bacteria for a minimum of three years. The result? Dr. O'Hara's game-changing postbiotic metabolites, which are key to supporting long-term digestive, immune, and cognitive function. Dr. O'Hara's probiotics, an all-star formulation, and the best probiotic on the market today for overall digestive health and wellness.