The probiotic supplement ProBiotix's Quest contains a unique combination L.bulgaricus and L.acidophilus, which is "friendly" probiotic lactic acid bacteria that exist naturally in the human gut. The combination L.bulgaricus L.acidophilus and according to studies may help to restore intestinal flora after taking antibiotics and reduce the symptoms associated with antibiotics, such as diarrhea. Probiotics in ProBiotix help maintain an optimal ratio of probiotic bacteria in the gut and contribute to health and normal bowel function and the body's defenses protect against growth of pathogenic microorganisms in the gut.