GO PROBIOTIC 40 BILLION is designed to maintain and restore good gut bacteria. Antibiotic medication, the contraceptive pill, alcohol and stress can create an imbalance of good and bad microflora in the intestinal tract which can lead to ill health. Having high levels of good bacteria in the gut is essential for maintaining a healthy immune system and all round good health. GO Probiotic 40 Billion contains HOWARU restore ®, a clinically proven blend of 5 heat stable and stomach acid resistant probiotic strains totalling 40 billion live cells.