Table 1.

Patient, Intervention/Exposure, Comparator, Outcome, Study Design (PICOS) Criteria for the Inclusion/Exclusion Criteria.

Parameter	Inclusion Criteria	Exclusion Criteria
Population	Adults and children with specific mental health disorders (depression, bipolar and schizophrenia), and neurological disorders including (epilepsy and neuroinflammation)	Studies include other disorders, such as eating disorders and intellectual disabilities
Intervention	Vitamin D supplementation	Nutrients apart from vitamin D and other combined nutrients
Comparison	Influence of vitamin D on specified disorder assessed	No specificity in the comparison
Outcomes	Specific mental disorders including (depression, bipolar and schizophrenia), and neurological disorders including (epilepsy, and neuroinflammation)	Generalised mental or neurological health and comparison of different disorders in a single study.
Study design	Peer-reviewed studies published in English, including those that utilized; randomised controlled trials, retrogressive studies, randomised crossover trials, cohort studies, case-control studies, cross-sectional studies, systematic reviews, meta-analyses, and exception of experimental studies.	Articles not published in English, including websites, letters to the editor, expert opinions, case studies, case reports, and reports.