Is magnesium good for type 2 diabetes?
Yes — meta-analyses show 250–450 mg of elemental magnesium per day improves fasting glucose, insulin sensitivity, and HbA1c by 0.3–0.4% in people with type 2 diabetes or prediabetes. Up to 48% of type 2 diabetics are magnesium-deficient.
Last updated 27 June 2026
Why deficiency is so common in diabetes
High blood glucose causes urinary magnesium loss. Metformin reduces magnesium absorption. The result: a self-reinforcing cycle of low magnesium and worsening insulin resistance.
Protocol
300–400 mg elemental magnesium daily, glycinate or citrate. Take with the largest meal. Monitor blood glucose for the first month — some people need a small medication adjustment after 2–3 months.
Frequently asked
- Will magnesium lower my blood sugar too much?
- Unlikely on its own, but combined with diabetes medication you may see lower readings — work with your GP.
- Does metformin deplete magnesium?
- Mildly, yes — supplementation is generally recommended for long-term metformin users.
Educational content — not medical advice. Health claims comply with EU Regulation 1924/2006 and the Union Register of authorised claims (Regulation 432/2012). Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle. Always consult your GP or pharmacist before changing supplements, particularly if you take prescription medication or have kidney disease.