Magnesium Glycinate
Complete evidence review for diabetes management
Evidence Rating
Moderate Evidence
Summary
Magnesium deficiency is extremely common in diabetes (25-38% of patients) and is associated with worse glycemic control and higher complication risk. Supplementation shows modest improvements in fasting glucose and insulin sensitivity, with stronger effects in those who are deficient. Magnesium glycinate is preferred for its high absorption and minimal GI side effects.
-0.1 to -0.4%
A1C Reduction
250-450mg
daily
3
Key Studies
Insulin
sensitivity improvement
What is Magnesium Glycinate?
Magnesium is essential for insulin signaling and glucose transport into cells. It's a cofactor for over 300 enzymes, including those involved in carbohydrate metabolism. Low magnesium increases insulin resistance and inflammation. Supplementation improves insulin receptor function and reduces inflammatory markers.
Clinical Evidence
Key studies supporting Magnesium Glycinate's use in diabetes management:
Rodriguez-Moran & Guerrero-Romero (2003)
63 patients with Type 2 diabetes and low magnesium levels. Magnesium chloride 50ml/day (equivalent to ~380mg elemental) for 16 weeks improved HOMA-IR (insulin resistance) by 44% and reduced fasting glucose from 186 to 140 mg/dL.
Simental-Mendia et al. (2016)
Meta-analysis of 18 RCTs. Magnesium supplementation reduced fasting glucose by 4.6 mg/dL and improved HOMA-IR. Effects stronger in those with diabetes vs. healthy individuals.
Verma & Garg (2017)
60 patients with poorly controlled Type 2 diabetes. Magnesium 300mg daily for 3 months reduced A1C by 0.3% and fasting glucose by 28 mg/dL compared to placebo.
Drug Interactions
Critical Warning: Always consult your healthcare provider before combining Magnesium Glycinate with any diabetes medication.
| Medication | Risk Level | Details |
|---|---|---|
| Antibiotics (fluoroquinolones, tetracyclines) | Moderate | Magnesium binds to these antibiotics and reduces absorption. Take at least 2 hours apart. |
| Bisphosphonates (Fosamax, etc.) | Moderate | Take bisphosphonates at least 2 hours before magnesium to avoid reduced absorption. |
| Diuretics | Moderate | Loop and thiazide diuretics increase magnesium loss. Supplementation may be especially important. |
| Proton pump inhibitors | Moderate | Long-term PPI use depletes magnesium. Consider supplementation if on PPIs long-term. |
Dosage
The most studied protocol is 250-450mg daily. Magnesium glycinate is the best choice for absorption and GI tolerance. Avoid magnesium oxide (only 4% absorbed). Look for 'elemental magnesium' content, not total compound weight. Start with 100-200mg and increase gradually.
Product Dosage Comparison
| Product | Dose per Capsule | Matches Studies? |
|---|---|---|
| Clinical trials | 250-450mg elemental magnesium daily | |
| Doctor's Best Magnesium | 100mg elemental per tablet | |
| NOW Magnesium Glycinate | 100mg elemental per capsule | |
| Magnesium oxide | 400mg per tablet (4% absorbed) |
Side Effects
| Side Effect | Frequency | Management |
|---|---|---|
| Diarrhea | 5-10% | Glycinate form has lowest GI effects. Reduce dose or split into multiple doses. |
| Nausea | 5% | Take with food |
| Low blood pressure | Rare | Monitor if on blood pressure medications |
Who Should NOT Take Magnesium Glycinate
- Severe kidney disease (impaired magnesium excretion)
- Heart block (without pacemaker)
- Myasthenia gravis
Recommended Products
The following products meet our quality criteria. Links are affiliate links - see our affiliate disclosure.
Doctor's Best High Absorption Magnesium
- Form: Magnesium glycinate/lysinate, 100mg elemental per tablet
- Third-party testing: Tested for identity and purity
- Dosage matches studies: Yes
- Notable: Chelated for optimal absorption. Well-tolerated.
- Price: ~$15 for 240 tablets (80-day supply at 300mg/day)
NOW Magnesium Glycinate
- Form: 100mg elemental per capsule
- Third-party testing: GMP certified
- Dosage matches studies: Yes
- Price: ~$20 for 180 tablets
Want the complete supplement-medication interaction chart?
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