Psychiatric and neurocognitive disorders contribute to an all-cause morbidity burden worldwide. To date, current treatment modalities do not completely address the management of these conditions. As such, the available pharmacological options we have undesirable side-effects. Recently, there has been increasing evidence that the gut microbiome may play a role in various mental health and neurocognitive disorders, particularly through the process of dysbiosis. There is a bidirectional interaction between an individual and their gut microbiome via the microbiome-gut-brain axis. Many individuals with a psychiatric diagnosis, such as anxiety and depression, have been shown to have altered microbial composition compared to health controls. From this, there is a growing body of research looking at ways to modulate the gut microbiome from a state of dysbiosis to eubiosis. Much of these therapies involve the use of probiotics, prebiotics, and synbiotics; or more collectively known as microbial therapeutics. The goal of these treatments is to reduce gut permeability and inflammation by various mechanisms and provide benefit to patients with mental health disorders. Incorporating the role of gut health and management may serve as an adjutant therapeutic approach to the treatment of patients with neurocognitive or mental health conditions. Ongoing research, particularly with random-controlled trials and longitudinal studies, is needed to help solidify these approaches as a viable therapeutic modality.