CONCLUSIONS: Current 8-12-week RCT evidence does not demonstrate a clear benefit of probiotic supplementation for ADHD core symptom-related measures. However, exploratory findings suggest that probiotic supplementation may have potential for improving broad parent-reported emotional-behavioral outcomes, particularly CPRS-assessed behavioral symptoms. This potential benefit should be interpreted cautiously because it was based on a small number of heterogeneous trials and was not consistently…
