Magnesium
An essential mineral involved in over 300 enzymatic reactions in the human body.
Up to 50% of people in developed countries are deficient in magnesium. This mineral is critical for sleep quality, stress response, muscle function, blood pressure regulation, and energy production — yet it's one of the most overlooked deficiencies.
Evidence Quality
Extensive clinical evidence across multiple health domains. Deficiency is well-documented and supplementation benefits are highly replicable. One of the most universally recommended minerals by integrative and conventional medicine alike.
What Is Magnesium?
Magnesium is the fourth most abundant mineral in the body and the second most common intracellular cation. It serves as a cofactor for over 300 enzymes, participates in DNA repair, protein synthesis, and the production of ATP (cellular energy).
Modern diets — high in processed foods and low in leafy greens, legumes, and whole grains — are frequently magnesium-poor. Stress, alcohol, and certain medications (diuretics, PPIs) further deplete magnesium stores.
Key Benefits
Sleep Quality
Regulates melatonin and GABA, the brain's main calming neurotransmitter. Studies show magnesium glycinate significantly improves sleep onset, duration, and quality.
Stress & Anxiety Reduction
Magnesium blocks NMDA receptors and regulates the HPA (stress) axis — deficiency is directly linked to heightened anxiety and exaggerated stress responses.
Muscle Function & Recovery
Essential for muscle contraction and relaxation. Deficiency causes cramps, spasms, and restless legs. Athletes require higher amounts for performance and recovery.
Blood Sugar & Cardiovascular Health
Improves insulin sensitivity and lowers fasting blood glucose. Also reduces blood pressure by relaxing blood vessel walls (vasodilation).
Dosage & How to Take It
Standard dose
200–400 mg elemental magnesium per day
Timing
Evening or before bed — particularly beneficial for sleep and stress. Can be split into two doses if digestive sensitivity occurs.
Best forms
Magnesium glycinate — best for sleep/anxiety (gentle on digestion). Magnesium malate — best for energy and muscle fatigue. Magnesium citrate — good bioavailability, mild laxative effect.
Avoid
Magnesium oxide — very low absorption (only ~4%). Commonly found in cheap supplements.
Contraindications & Cautions
- Kidney disease: Kidneys regulate magnesium excretion — impaired kidneys cannot clear excess magnesium safely. Avoid supplementing without medical supervision.
- Antibiotics & bisphosphonates: Magnesium may reduce absorption — space doses by 2 hours.
- Diuretics: Some diuretics deplete magnesium further; others increase it — check with your doctor.
- High doses: Above 500 mg/day may cause loose stools or diarrhea, especially with magnesium citrate or oxide.
What to Look for When Buying
- Choose glycinate, malate, or citrate forms — avoid oxide
- Label shows elemental magnesium mg (not total compound weight)
- Third-party tested (NSF Certified for Sport or similar)
- Free from unnecessary fillers, artificial colors, or sweeteners
Where to Buy
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Amazon — Magnesium Glycinate (recommended)
High-absorption chelated form. Ideal for sleep, stress and muscle recovery.
iHerb — Magnesium Glycinate & Malate
Wide selection of chelated magnesium forms. Competitive international pricing.