The effect of oral magnesium supplementation on glycemic control and metabolic parameters in type 2 diabetes mellitus: a double-blind randomized controlled trial - Report - MDSpire

The effect of oral magnesium supplementation on glycemic control and metabolic parameters in type 2 diabetes mellitus: a double-blind randomized controlled trial

  • By

  • Juhaina Salim Al-Maqbali

  • Abdullah M. Al Alawi

  • Alaa Osman

  • Ahmed Al-Farqani

  • Suneel Kumar

  • Abdullah Al Futisi

  • Ali Al-Mamari

  • Ibrahim Al-Zakwani

  • Mohammed Al Za’abi

  • July 16, 2026

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Clinical Report: Impact of Oral Magnesium Supplementation on Glycemic Regulation

Overview

This study evaluated the effects of magnesium oxide supplementation on glycemic control in adults with Type 2 Diabetes Mellitus (T2DM). Magnesium supplementation showed a significant reduction in fasting blood glucose in a subgroup (p = 0.039), while the reduction in HbA1c was -0.30% in the magnesium group compared to -0.05% in the placebo group, which was not statistically significant (p = 0.145).

Background

Type 2 Diabetes Mellitus (T2DM) management focuses on achieving glycemic control to prevent complications. Magnesium plays a crucial role in insulin signaling and glucose metabolism, and its deficiency is linked to poor glycemic control. Understanding the impact of magnesium supplementation could provide additional strategies for managing T2DM.

Data Highlights

ParameterMagnesium GroupPlacebo GroupP-value
Fasting Blood GlucoseSignificant reductionNot reported0.039
HbA1c Reduction-0.30%-0.05%0.145
Achieved HbA1c < 7%14.0%6.0%0.043

Key Findings

  • 247 participants were included in the intention-to-treat analysis.
  • Median age of participants was 58 years, with a median diabetes duration of 16 years.
  • 7.3% had hypomagnesemia by ionized magnesium and 8.1% by total magnesium.
  • Fasting blood glucose significantly reduced in a subgroup receiving magnesium (p = 0.039).
  • HbA1c reduction was modest and not statistically significant (−0.30% vs. −0.05%; p = 0.145).
  • A higher proportion of participants in the magnesium group achieved HbA1c < 7% compared to placebo (14.0% vs. 6.0%; p = 0.043).

Clinical Implications

Clinicians should consider the findings regarding magnesium supplementation in managing T2DM, particularly for patients with hypomagnesemia or shorter diabetes duration, while noting that the overall reduction in HbA1c did not reach statistical significance.

Conclusion

The study indicates that magnesium oxide supplementation may improve magnesium status and show favorable trends in glycemic control among certain subgroups of T2DM patients.

Related Resources & Content

  1. Frontiers in Endocrinology, 2026 -- Effect of oral magnesium supplementation on glycemic control and metabolic parameters in type 2 diabetes mellitus: a double-blind randomized controlled trial
  2. American Diabetes Association, 2026 -- Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes
  3. ADA News — Study suggests regular toothbrushing improves glycemic control in people with diabetes
  4. Frontiers in Endocrinology — Effect of probiotics derivatives (postbiotics and metabiotics) on glycemic control in individuals with type 2 diabetes: a randomized clinical trial (DELI_Diab study)
  5. the ophthalmologist — Magnesium & DR Risk
  6. The Journal of Clinical Endocrinology & Metabolism — Glucose Parameters, Inflammation Markers, and Gut Microbiota Changes of Gut Microbiome–Targeted Therapies in Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
  7. Magnesium & DR Risk
  8. Study suggests regular toothbrushing improves glycemic control in people with diabetes
  9. 5. Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes—2026 | Diabetes Care | American Diabetes Association
  10. Frontiers | The effect of oral magnesium supplementation on glycemic control and metabolic parameters in type 2 diabetes mellitus: a double-blind randomized controlled trial
  11. Oral magnesium supplements and insulin resistance in individuals with diabetes and pre-diabetes: an updated systematic review and meta-analysis of randomized controlled trials | BMC Nutrition | Springer Nature Link

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