Supplements · Metabolic & Cardiometabolic
probiotics decreases insulin resistance
Part of: 🧪 Probiotics
📅 Last reviewed: 2026-07-15 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
Probiotics/synbiotics improve insulin resistance in PCOS.
The evidence (7)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| prob-2020 2020 | meta-analysis | supports | moderate | ↓HOMA-IR -0.69, ↓insulin, ↓CRP. |
| Bodake RD et al 2026 · study_type: observational | observational | supports | low | Single-arm pre-post, n=90 PCOS women, multistrain probiotic 12wk. FBG, fasting insulin, HOMA-IR all improved P<0.001 vs baseline. No control/placebo arm; no CI or effect size given. |
| Hamsho M et al 2026 · study_type: meta-analysis | meta-analysis | supports | moderate | MA of 6 RCTs, probiotic+metformin vs metformin alone in PCOS. HOMA-IR: MD -0.50, 95% CI -0.73 to -0.26, low-to-moderate heterogeneity. |
| prob-negligible-2019 2019 | meta-analysis | contradicts | moderate | No effect on HOMA-IR/FPG; 'negligible.' |
| umbrella-prebio-2023 2023 | meta-analysis | supports | moderate | Benefits real but LOW GRADE certainty. |
| synbiotic-pcos-2023 2023 | meta-analysis | supports | moderate | Pro/pre/synbiotics improved IR/lipids/CRP in PCOS. |
| Sun Z et al 2026 · study_type: meta-analysis | meta-analysis | mixed | moderate | MA of 11 RCTs, n=780, PCOS. Fasting insulin reduced (MD -1.41, 95% CI -2.76 to -0.05) but HOMA-IR NOT significant. Testosterone, TG, LDL, BMI significantly improved (GRADE high); fasting insulin GRADE moderate. |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.