The present invention relates to a composition comprising prebiotic (prebiotic adjuvant) for decreasing inflammatory process by improving the homeostasis of non-specific immune parameters and of lymphocyte subpopulations. It also relates to the use of a prebiotic formulation in the manufacture of a medicament or a food or petfood composition for decreasing inflammatory process and/or abnormal activation of non-specific immune parameters, such as phagocytes.