Probiotics, synbiotics and berberine in Type 2 diabetes mellitus: A systematic review, meta-analysis, and molecular dynamics simulation study

Clinical Snapshot

Key Findings

• P Value: Statistically significant (exact values not provided)

• Effect Size: FPG: -0.71 mmol/L; HbA1c: -0.19%

• Primary Outcome: Fasting plasma glucose and HbA1c reduction

• Nnt Or Sensitivity: Clinical significance limited - authors describe effects as 'modest'

• Confidence Interval: Not reported in abstract

Clinical Application

High - probiotics and berberine are readily available supplements Relevant to Australian practice as complementary therapy; not PBS-listed but available as complementary medicines under TGA regulation Adults with Type 2 diabetes seeking adjunctive glycemic management

Abstract

BACKGROUND: Type 2 diabetes mellitus is characterized by impaired regulation of blood glucose. Probiotics, synbiotics, and berberine (BBR) have been proposed as adjunctive interventions, but their overall effectiveness remains uncertain. OBJECTIVE: To evaluate the effects of these interventions on glycemic control and to explore a potential molecular interaction of BBR with a key carbohydrate-digesting enzyme. METHODS: A systematic review and meta-analysis of randomized controlled trials was conducted. Pooled effects were estimated for fasting plasma glucose (FPG) and glycated hemoglobin (HbA1c) using random-effects models. A subgroup analysis compared probiotics with placebo. An exploratory computational analysis examined the interaction of BBR with α-glucosidase. RESULTS: More than 30 trials involving over 2,000 participants were included. The pooled analysis showed significant but modest reductions in FPG (-0.71 mmol·L ⁻ ¹) and HbA1c (-0.19%), with substantial between-study variability. Probiotics alone also reduced FPG (approximately -0.80 mmol·L ⁻ ¹) and HbA1c (approximately -0.21%) compared with placebo. Computational analysis indicated weaker enzyme binding for BBR than for the reference inhibitor acarbose. CONCLUSIONS: Probiotics, synbiotics, and BBR provide statistically significant but clinically modest improvements in glycemic control. These findings support their use as adjunctive, rather than primary, therapeutic options and highlight the need for larger and longer trials with standardized interventions. SYSTEMATIC REVIEW REGISTRATION: https://www.crd.york.ac.uk/PROSPERO/view/CRD420251116387, identifier CRD420251116387.

References

1. 1.Shadin, M., Bhuia, M. S., Alfaifi, M., Altemani, F. H., Altemani, A. H., Alsenani, F., Saleh, N., & Islam, M. T. (2026). Probiotics, synbiotics and berberine in Type 2 diabetes mellitus: A systematic review, meta-analysis, and molecular dynamics simulation study. PLoS One. https://doi.org/10.1371/journal.pone.0348907