All of us carry trillions of bacteria with us for the whole of our lives, and they protect us from disease. This protection is under threat by ultra-hygienic living conditions, and by the overuse of antibiotics. Probiotics (beneficial microbes) can support our resident microbes (microflora), and 'Probiotic Allies' explains how. It describes the microflora in different parts of the body, reports on high-quality evidence that proves probiotics work, and tackles practical questions about the use of probiotics. Conditions covered include diarrhoea, constipation, IBS, IBD, lactose intolerance, gastric ulcers, allergies and female urogenital infections.