Does Probiotics Gas Meta-Analysis work?

The current Migaku evidence database contains 2 reusable source documents for Probiotics Gas Meta-Analysis. This answer focuses on strength of evidence and what the studies can or cannot prove. - RESULTS: This study synthesized evidence from 16 case-control studies and 6 randomized controlled trials (RCTs) through a systematic review and meta-analysis. [Li J (2026); evidence level 1] - The case-control analysis found significantly lower plasma levels of acetate (SMD = -0.51, 95% CI [-0.86, -0.15]), propionate (SMD = -0.65, 95% CI [-1.06, -0.25]), butyrate (SMD = -0.43, 95% CI [-0.72, -0.15]), and valerate(SMD = -1.09, 95% CI [-2.02, -0.17]) in individuals with depression compared to healthy controls. [Li J (2026); evidence level 1] - In fecal samples, no significant differences were found in the three main SCFAs, but fecal valerate was decreased and isobutyrate was increased. [Li J (2026); evidence level 1] - BACKGROUND: Short-chain fatty acids (SCFAs) are essential metabolites in the interaction between gut microbiota and the host. [Li J (2026); evidence level 1] - 1 Strain Evidence strength Proposed Mechanism Lactobacillus acidophilus DDS-1 ( ) 2016 Pakdaman et al. [Perets Tsachi Tsadok (2026); evidence level 3] 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.