According to Jürgen Schrezenmeir and Michael de Vrese from the Institute of Physiology and Biochemistry of Nutrition — Kiel, Germany Probiotics are: «A preparation or product containing viable, defined micro-organisms in sufficient numbers, which alter the microflora of the host intestine and, by that,
exert beneficial health effects on the host»
Most of these molecules, which can be found with or without synthetic modifications and
exert their
beneficial effect on human
health, are derived from microorganisms or plants.