The CNP Probiotics, Prebiotics and Mental Health Research Category consolidates research exploring the effects of probiotics, prebiotics, psychobiotics, and synbiotics on mental health. To view each original study on the open internet, click “Original.” To view the CNP-written abstract summary, click “CNP Summary.” While only some CNP-written abstract summaries are available below for free, all are available to CNP members through the CNP Library Membership.