Magnesium
Also known as: Magnesium Glycinate, Magnesium Citrate, Magnesium Oxide, Mg
Magnesium is an essential mineral involved in over 300 enzymatic reactions in the body. It is crucial for energy production, muscle and nerve function, blood sugar control, blood pressure regulation, and bone health. Despite its importance, magnesium deficiency is surprisingly common.
Benefits
Supports muscle relaxation and reduces cramps. Critical for nerve function and may help reduce anxiety. Helps regulate blood sugar and insulin sensitivity. Supports cardiovascular health and may lower blood pressure. Essential for bone health — about 60% of body magnesium is stored in bones. May improve sleep quality. Helps prevent migraines in some people.
Recommended Dosage
RDA: 400–420 mg/day for men, 310–320 mg/day for women. Common supplement doses: 200–400 mg daily. Upper limit from supplements: 350 mg (does not include dietary intake). Different forms have different absorption rates: glycinate and citrate are better absorbed than oxide. Take with food to improve absorption and reduce digestive side effects.
Food Sources
Dark leafy greens (spinach, Swiss chard, kale), nuts (almonds, cashews, peanuts), seeds (pumpkin, sunflower, flax), legumes (black beans, edamame), whole grains, dark chocolate, avocado, bananas, tofu, fatty fish.
Side Effects
Common with oral supplements: Diarrhea (especially magnesium oxide and citrate), nausea, stomach cramps. Magnesium glycinate and malate forms are generally easier on the stomach. Excessive intake can cause dangerous hypermagnesemia: low blood pressure, irregular heartbeat, respiratory depression, cardiac arrest (extremely rare with oral supplements in people with normal kidney function).
Interactions
May reduce absorption of certain antibiotics (tetracyclines, fluoroquinolones) — separate by 2–4 hours. Bisphosphonates (osteoporosis drugs) — reduced absorption when taken together. Diuretics — loop and thiazide diuretics increase magnesium loss. Proton pump inhibitors (PPIs) — long-term use can cause magnesium depletion. Zinc supplements — high doses of zinc may interfere with magnesium absorption.
Warnings
People with kidney disease should not take magnesium supplements without medical supervision — impaired kidneys cannot eliminate excess magnesium effectively. Start with lower doses and increase gradually to minimize GI side effects. Very high doses can be dangerous, especially intravenously. If taking medications, check for interactions.
Deficiency Symptoms
Muscle cramps and spasms, fatigue and weakness, numbness and tingling, headaches and migraines, irregular heartbeat, anxiety and irritability, insomnia, loss of appetite, nausea. Severe deficiency: Personality changes, seizures, abnormal heart rhythms, low calcium and potassium levels.
Frequently Asked Questions
What are the benefits of Magnesium?▼
Supports muscle relaxation and reduces cramps. Critical for nerve function and may help reduce anxiety. Helps regulate blood sugar and insulin sensitivity. Supports cardiovascular health and may lower blood pressure. Essential for bone health — about 60% of body magnesium is stored in bones. May improve sleep quality. Helps prevent migraines in some people.
What is the recommended dosage for Magnesium?▼
RDA: 400–420 mg/day for men, 310–320 mg/day for women. Common supplement doses: 200–400 mg daily. Upper limit from supplements: 350 mg (does not include dietary intake). Different forms have different absorption rates: glycinate and citrate are better absorbed than oxide. Take with food to improve absorption and reduce digestive side effects.
What foods contain Magnesium?▼
Dark leafy greens (spinach, Swiss chard, kale), nuts (almonds, cashews, peanuts), seeds (pumpkin, sunflower, flax), legumes (black beans, edamame), whole grains, dark chocolate, avocado, bananas, tofu, fatty fish.
What are the side effects of Magnesium?▼
Common with oral supplements: Diarrhea (especially magnesium oxide and citrate), nausea, stomach cramps. Magnesium glycinate and malate forms are generally easier on the stomach. Excessive intake can cause dangerous hypermagnesemia: low blood pressure, irregular heartbeat, respiratory depression, cardiac arrest (extremely rare with oral supplements in people with normal kidney function).
What are the symptoms of Magnesium deficiency?▼
Muscle cramps and spasms, fatigue and weakness, numbness and tingling, headaches and migraines, irregular heartbeat, anxiety and irritability, insomnia, loss of appetite, nausea. Severe deficiency: Personality changes, seizures, abnormal heart rhythms, low calcium and potassium levels.
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Supplement Disclaimer
This supplement information is for educational purposes only and should not replace professional medical advice. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medications, or have a medical condition.