Myths vs facts: Magnesium and blood sugar

Magnesium and blood sugar: myths vs facts. Magnesium is involved in glucose metabolism and insulin action. Low magnesium levels are associated with higher diabetes risk in observational studies. However, evidence that magnesium supplements significantly lower blood sugar in healthy individuals is moderate. Some randomized trials show modest improvements in fasting glucose and HbA1c in people with deficiency or prediabetes, but not in those with normal levels. Marketing often exaggerates benefits, claiming magnesium alone can 'cure' insulin resistance. A blood test (serum or RBC magnesium) is recommended before supplementing. High doses can cause diarrhea and may be dangerous in kidney disease. Bottom line: magnesium can be a helpful adjunct but is not a standalone treatment. Evidence level: human-moderate.