Level of Evidence: "Do Nutrients and Supplements Improve Cognitive Function? A Systematic Review and Meta-Analysis"
This systematic review and meta-analysis of randomized controlled trials offer moderate to strong evidence in the hierarchy of evidence-based medicine.
Study Design & Strength of Evidence
The review included:
- 24 randomized controlled trials (RCTs) → Level 1B (high-quality individual RCTs)
- Meta-analysis of RCTs → Level 1A (greatest level of evidence)
