The term probiotic (which derives from the Greek 'pro-bios', i.e. pro-life) indicates a series of substances capable of stimulating and favouring the growth and development of particular microorganisms, characterised by their positive action on human health and normally found as residents of our intestine. Taking probiotics is especially useful for restoring intestinal balance when compromised by factors such as stress, seasonal changes, changes in diet, prolonged antibiotic intake or for recovery after gastrointestinal infections.