CanPrev Post-Biotik Immunobiotics 30 Veggie CapsImproves the immune response Provides nourishment for your good bacteria Helps prevent cold like symptoms How do postbiotics work? The immune system relies on the compounds produced by friendly bacteria in the microbiome to regulate the immune response. Postbiotics contain these same bioactive compounds to help activate the immune response, even if our microbiome function is disrupted. Like a prebiotic, a postbiotic feeds your friendly bacteria.