Does Probiotic Depression Meta-Analysis work?

The current Migaku evidence database contains 2 reusable source documents for Probiotic Depression Meta-Analysis. This answer focuses on strength of evidence and what the studies can or cannot prove. - The microbiota-gut-brain axis suggests probiotics and synbiotics could modulate sleep, but evidence in exercised populations is limited. [Salehi Asl M (2026); evidence level 1] - Data extraction, risk of bias assessment (RoB 2), and narrative synthesis followed SWiM guidelines. [Salehi Asl M (2026); evidence level 1] - Nine of twelve primary sleep outcomes favored supplementation, with significant effects for probiotics (combined p p Conclusion Probiotic and synbiotic supplementation may improve sleep in exercised populations, especially perceived quality and latency. [Salehi Asl M (2026); evidence level 1] - Background Sleep is crucial for recovery and optimal performance in athletes; however, poor sleep is common during periods of intensive training or competition. [Salehi Asl M (2026); evidence level 1] - Probiotic monotherapy was associated with a small but statistically significant reduction in depressive symptoms (SMD = -0.38, 95% CI: -0.57 to -0.18, p = 0.0002, I² = 51%). [Haiyan L (2026); evidence level 1] Evidence levels are sorting aids, not final clinical grades. Level 1 usually indicates systematic-review style evidence, level 2 indicates randomized trials or public-health guidance, and lower levels need more cautious wording. This page is educational. People with medical conditions, pregnancy, medication use, or unusual symptoms should ask a qualified clinician before changing supplements, medication, or treatment routines.