As a prebiotic food additive, lactulose is utilised in infant formulas and health foods. Its chemical and physiological properties are close to other prebiotics wherein the linkage of galactose and fructose is neither split by human enzymes nor absorbed in the small intestine. Unchanged lactulose reaches the colon where it stimulates the growth of Lactobacillus spp. and Bifidobacteria spp., generating a large number of short chain fatty acids (Schumann, 2002).