Magnesium and the nervous system: stress and fatigue

Chronic fatigue, tense shoulders, irritability and poor sleep aren’t always a matter of “personality” or an inevitable sign of aging — often a specific mineral deficiency is behind them. One of the most common culprits is magnesium. In this article we look at how magnesium and the nervous system are connected and how the mineral affects stress and fatigue.

How are magnesium and the nervous system connected?

Magnesium takes part in more than 300 enzymatic reactions in the body. Without enough magnesium, muscles don’t relax properly, the nervous system doesn’t “switch off” for the evening, and energy isn’t produced at the cellular level the way it should be. That is exactly why magnesium and the nervous system are so closely linked — the mineral helps release tension and supports the transition into a state of rest. According to the health claims approved by the European Food Safety Authority (EFSA), magnesium contributes to the normal functioning of the nervous system and to the reduction of tiredness and fatigue. The article Magnesium explains the mineral’s role in more depth.

Stress and magnesium are caught in a vicious circle: under pressure the body “burns” more magnesium, while a deficiency in turn worsens anxiety and insomnia. You can read about the wider consequences of stress, including for body weight, in the article Stress – the No. 2 cause of overweight.

What are the signs of magnesium deficiency?

According to various estimates, a significant share of the Western population doesn’t get enough magnesium from food. The tricky part is diagnosis: a standard blood test shows only about 1% of the body’s magnesium — the portion found in blood serum. The remaining nearly 99% is in the bones, muscles and cells, which is why a test can look “normal” even when there is a real deficiency.

Common signs that may point to magnesium deficiency are muscle cramps, eyelid twitching, anxiety, insomnia and cravings for chocolate. It is also worth knowing that vitamin B6 helps magnesium absorption and vitamin D needs magnesium to become active — these nutrients often work together. The article Magnesium – a vital mineral also covers the broader importance of the mineral.

In the Estonian context, several factors can promote magnesium deficiency. Dark winters raise stress levels, so the body uses more magnesium. Northern soils have become depleted over time, so foods may contain fewer minerals than a few decades ago. Add the typical factors of city life — coffee, chronic stress and overwork — which all deplete magnesium reserves. Drinking water in most regions of Estonia isn’t rich in magnesium either. For that reason, many people should consciously and regularly keep an eye on the variety of their diet and, where needed, on using an additional supplement.

Which form of magnesium should you choose?

Not all forms of magnesium are equal, and the difference in bioavailability is large:

• Glycinate — one of the forms with the highest absorption. Glycine is an amino acid with a calming effect, which is why glycinate is especially well suited to supporting sleep, stress and the nervous system. The best choice for the evening.
• Citrate — considerably better absorbed than oxide, with good value for money. A universal form for correcting a deficiency, suitable for morning or daytime.
• Threonate — associated with cognitive function and memory; a choice when you need mental clarity.
• Oxide — very poorly absorbed, so not effective for correcting a deficiency.

How much magnesium should you take, and when?

A typical amount is 200–400 mg of elemental magnesium per day. “Elemental” means pure magnesium — look for exactly that number on the label, not the weight of the whole tablet. Start with a smaller dose (100–200 mg) and increase gradually. If you get diarrhea, the dose is too high — reduce it and give your body time to adjust.

The timing depends on the form: it makes sense to take glycinate in the evening, 1–2 hours before bed, because it supports relaxation and sleep quality; take citrate in the morning or during the day to correct a deficiency. Some combinations are worth separating in time — zinc (they compete for absorption; separate by about 2 hours), antibiotics (2–3 hours) and the thyroid hormone thyroxine (about 4 hours). Many people notice the first improvements, especially in sleep and muscle relaxation, within 3–7 days, but fully correcting a deficiency usually takes 4–6 weeks of regular use.

If fatigue is persistent or severe, don’t rely on a supplement alone — see a doctor and have, for example, magnesium, vitamin D, ferritin and thyroid markers checked. If you take medication, always discuss supplements with your treating physician.

References

• EFSA. Health claims related to magnesium: contribution to the normal functioning of the nervous system and to the reduction of tiredness and fatigue.
• NIH Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals.
• Fitness.ee e-guide “Energy and Calm” (chapter 2: Magnesium — the mineral of calm).

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