Is Magnesium useful for blood sugar?

Magnesium is an essential mineral involved in over 300 enzymatic reactions, including insulin signaling and glucose metabolism. Low magnesium levels are consistently associated with higher risk of insulin resistance and type 2 diabetes in observational studies. Some randomized controlled trials show that magnesium supplementation can modestly improve fasting glucose and insulin sensitivity, particularly in individuals with magnesium deficiency or prediabetes. However, the evidence is not uniform: in people with normal magnesium levels or established diabetes, benefits are often small or non-significant. The effect appears dose-dependent and influenced by baseline status. Importantly, magnesium supplements are not a substitute for a balanced diet, exercise, or prescribed medications. High doses can cause diarrhea or, in kidney disease, dangerous hypermagnesemia. For personalized assessment, blood levels (e.g., serum magnesium) are more actionable than genetic tests. Overall, magnesium is a supportive but not primary blood sugar regulator. The evidence level is moderate – most consistent benefits occur in those with confirmed deficiency.