The term probioitcs refers to supplements that actually contain bacteria necessary for a healthy intestinal tract. Prebiotics are substances that feed and support healthy intestinal bacteria; galactooligosaccharides and long chain fructooligosaccharides are two prebiotics. Research appearing in the Journal of Nutrition (November 2007, Vol. 137) found that infants fed formula supplemented with prebiotics had a reduction in recurring infections. The infants were fed either formula fortified with fructooligosaccharides and galactooligosaccharides (8g/l) or a placebo consisting of maltodextrin for the first six months of their lives. The group receiving the prebioitcs had a reduction in recurring infections of 9.6% with a 6.7% reduction in respiratory infections.