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Magnesium – The Mineral for Muscles, Nerves, and Sleep
What is Magnesium?
Magnesium is an essential macromineral and the fourth most abundant mineral in the human body. It is a cofactor for over 300 enzymatic reactions – including protein synthesis, muscle and nerve function, blood sugar regulation, blood pressure control, and energy production. Without magnesium, many fundamental bodily processes do not function optimally.
Despite its importance, magnesium deficiency is common: studies estimate that 20–30% of the population in Germany do not get enough magnesium through their diet – often due to processed foods, an unbalanced diet, and depleted soils.
What does the body need magnesium for?
Energy (ATP synthesis)
Magnesium is essential for the activation of ATP (adenosine triphosphate). ATP must be bound to magnesium to be biologically active – so magnesium is literally the basis of every energy reaction in the body.
Muscles
Magnesium acts as a physiological calcium antagonist. While calcium triggers muscle contraction, magnesium is necessary for relaxation. Therefore, magnesium deficiency leads to increased muscle tension, cramps, and reduced recovery ability.
Nervous System
Magnesium regulates the NMDA receptor (an important glutamate receptor) and thus has neuroprotective and relaxing effects. Magnesium deficiency increases nervous system excitability and can promote anxiety, sleep problems, and migraines.
Sleep
Magnesium activates the parasympathetic nervous system and promotes GABA activity (the brain's primary inhibitory neurotransmitter). It also regulates melatonin (the sleep hormone) and is important for deeper, more restful sleep phases.
Bone Metabolism
Approximately 60% of the body's magnesium is stored in the bones. Magnesium regulates the activity of osteoblasts and osteoclasts and influences calcium distribution – important for strong bones, together with vitamin D3 and K2.
Magnesium Forms Compared
| Form | Bioavailability | Special Feature | Recommendation |
|---|---|---|---|
| Magnesium Citrate | High | Well-tolerated, slightly laxative in high doses | ⭐⭐⭐⭐⭐ All-rounder |
| Magnesium Glycinate/Bisglycinate | Very high | Especially good for sleep & relaxation, no laxative effect | ⭐⭐⭐⭐⭐ Best form in the evening |
| Magnesium Malate | High | Combination with malic acid – good for energy and pain | ⭐⭐⭐⭐ For exhaustion & fibromyalgia |
| Magnesium Threonate | High (brain) | Crosses the blood-brain barrier particularly well | ⭐⭐⭐⭐ For cognitive function |
| Magnesium Oxide | Very low (4%) | High elemental content, but hardly absorbable | ⭐ Not recommended |
| Magnesium Sulfate (Epsom Salt) | Low (oral) | Better as a bath additive (transdermal absorption) | ⭐⭐ Bath additive only |
Dosage
| Population Group | Daily Recommendation | Intake |
|---|---|---|
| Adults (reference value) | 300–400 mg elemental Mg | Evening with a meal |
| Athletes (increased loss) | 400–600 mg | Divided: morning + evening |
| Pregnant women | 350–450 mg | As per medical recommendation |
Important: On the product packaging, look for elemental magnesium, not the total weight of the magnesium molecule. 500 mg magnesium citrate ≠ 500 mg magnesium.
Signs of Magnesium Deficiency
- Muscle cramps (especially at night, calf cramps)
- Difficulty falling asleep / restless sleep
- Internal restlessness, increased irritability
- Exhaustion despite sufficient sleep
- Headaches / migraines
- Heart palpitations / skipped beats
- Constipation
Magnesium and Sports
The body loses magnesium through sweating. Athletes who train intensively may need 20–40% more magnesium daily than non-athletes. Magnesium deficiency in sports leads to:
- Poorer oxygen utilization (poorer aerobic efficiency)
- Increased lactate build-up with the same training stimulus
- Slower recovery
- Increased risk of injury due to muscle tension
Interactions
- Magnesium and calcium compete for the same transporters – do not take them simultaneously in very high doses
- Magnesium improves the conversion of vitamin D into its active form
- High caffeine and alcohol consumption increase magnesium excretion through the kidneys
Frequently Asked Questions (FAQ)
When should I take magnesium?
Evenings are ideal – the relaxing effect supports sleep. If taking a high dose, divide it into 2 portions (morning + evening).
Can you overdose on magnesium?
Orally ingested magnesium has a laxative effect at high doses before it can become toxic. The Tolerable Upper Intake Level for supplements is 250 mg in addition to diet (EU). Serious overdoses are only possible with intravenous administration.
Related Terms
Zinc · Vitamin D3 · Calcium · Electrolytes · Vitamin K2
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