Magnesium supplementation efficacy
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Magnesium Supplementation Efficacy for Blood Pressure and Cardiovascular Health
Magnesium supplementation has been shown to modestly lower blood pressure in adults. A meta-analysis of 34 randomized controlled trials found that a median dose of 368 mg/day for three months reduced systolic blood pressure by 2.00 mmHg and diastolic blood pressure by 1.78 mmHg, with greater effects in higher-quality studies and those with lower dropout rates. Even doses as low as 300 mg/day or supplementation for one month were sufficient to see benefits in blood pressure and serum magnesium levels . Additionally, long-term supplementation (350 mg/day for 24 weeks) in overweight and obese adults improved arterial stiffness, a marker of cardiovascular health, though it did not significantly change blood pressure in this group . In people with chronic kidney disease stages 3 and 4, magnesium supplementation was safe, increased serum magnesium, and improved serum calcification propensity, which may reduce vascular calcification risk .
Magnesium Supplementation for Glycemic Control and Diabetes
Magnesium supplementation has demonstrated efficacy in improving glycemic control in specific populations. In adults with prediabetes and low magnesium levels, daily supplementation (382 mg) for four months significantly reduced fasting and post-load glucose, improved insulin resistance (HOMA-IR), lowered triglycerides, and increased HDL cholesterol and serum magnesium. Over half of the magnesium group improved their glucose status compared to only 7% in the placebo group . For women with gestational diabetes, a meta-analysis of five randomized controlled trials found that magnesium supplementation significantly decreased fasting plasma glucose and insulin resistance, though it did not affect serum insulin, preterm delivery, macrosomia, or BMI .
Magnesium Supplementation and Mental Health: Depression and Anxiety
Several studies suggest magnesium supplementation may help reduce symptoms of depression and anxiety. A randomized clinical trial found that six weeks of magnesium chloride (248 mg/day) led to a clinically significant improvement in depression and anxiety scores in adults with mild-to-moderate depression, with effects seen within two weeks and good tolerability . Systematic reviews also indicate that magnesium supplementation may benefit people with depression, especially when combined with antidepressants, and may help reduce anxiety in vulnerable groups, though the quality of evidence is variable and more well-designed trials are needed Boyle2017Botturi2020.
Magnesium Supplementation and Inflammation
Magnesium supplementation has been shown to reduce markers of inflammation. A meta-analysis of 17 randomized controlled trials found that magnesium supplementation significantly decreased serum C-reactive protein (CRP) and increased nitric oxide (NO) levels, both of which are important for cardiovascular and overall health. Other inflammatory markers, such as plasma fibrinogen and interleukin-1, were also reduced in descriptive findings .
Magnesium Supplementation and Exercise Performance
Short-term magnesium supplementation (600 mg/day for 9 days) in regular exercisers increased circulating magnesium but had modest negative effects on maximal oxygen uptake (VO2max) and sprint power output, with no effect on time trial performance or gut microbiota. These findings suggest that magnesium supplementation is not beneficial for exercise performance in people without magnesium deficiency .
Conclusion
Magnesium supplementation is effective for modestly lowering blood pressure, improving arterial stiffness, and enhancing glycemic control in people with prediabetes, gestational diabetes, and low magnesium levels. It may also help reduce symptoms of depression and anxiety and lower inflammation markers. However, its benefits for exercise performance in healthy individuals are not supported, and more high-quality research is needed in several areas. Overall, magnesium supplementation is generally safe and well tolerated in the studied populations Zhang2016Guerrero‐Romero2015Tarleton2017+7 MORE.
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