New Roots Travelers' Probiotic - Helps to protect against travelers' diarrhea and support intestinal and gastrointestinal health. This probiotic formula populates the intestines with the therapeutic amount of 10 billion live cells of the beneficial yeast Saccharomyces boulardii. S. boulardii is a transient yeast which crowds out harmful bacteria that cause travelers’ sickness and neutralizes their toxins. This creates favorable conditions for the 11 billion colony-forming units of 11 scientifically proven probiotic strains to restore the balance of healthy intestinal flora.