‘A prebiotic is a selectively fermented ingredient that allows specific changes, bot in the composition and/or activity in the gastrointestinal microflora that confers benefits upon host wellbeing and health.’

Gibson GR, HM Probert, J Van Loo, RA Rastall, MB Roberfroid. 2004. Dietary modulation of the human colonic microbiota: updating the concept of prebiotics. Nutrition Research Reviews 17, 259-275.