Magnesium Matters: Are You Getting Enough?

Magnesium is often linked with muscle cramps and sleep, but this essential mineral does much more than that.

It is involved in hundreds of processes throughout the body, supporting energy production, muscle and nerve function, blood glucose regulation, cardiovascular health and bone health.

Magnesium intake can fall short when diets are low in vegetables, legumes, nuts, seeds and whole grains.

So, are you getting enough—and when might supplementation be worth considering?

Why Is Magnesium Important?

Magnesium supports many everyday functions, including:

• Energy production
• Normal muscle and nerve function
• Muscle contraction and relaxation
• Blood glucose regulation
• Cardiovascular function
• Bone health
• Electrolyte balance
• Protein production

Rather than thinking of magnesium simply as a “sleep supplement”, it is better understood as a foundational nutrient used throughout the body.

Can a Magnesium Blood Test Be Normal?

Yes.

Less than 1% of the body's magnesium is found in the blood, while most is stored in bone, muscle and other tissues.

This means a serum magnesium test can be useful, but it doesn't always give a complete picture of overall magnesium status.

Results are best considered alongside:

• Diet
• Digestive health
• Medications
• Alcohol intake
• Kidney function
• Symptoms
• Other pathology results

Symptoms alone also cannot diagnose magnesium deficiency.

Magnesium and Stress

Research suggests there may be a two-way relationship between magnesium and stress.

Ongoing stress may contribute to increased magnesium loss, while low magnesium availability may affect how the nervous system responds to stress.

However, magnesium is not a treatment for chronic stress on its own.

Sleep, nutrition, movement, psychological wellbeing, caffeine and alcohol intake and appropriate healthcare support are all important.

What About Magnesium and Sleep?

Magnesium is commonly taken for sleep because it supports normal nervous-system and muscle function.

However, research into magnesium supplements for sleep has produced mixed results.

Poor sleep can also be linked with:

• Stress
• Sleep apnoea
• Pain
• Restless legs
• Perimenopause and menopause
• Caffeine or alcohol
• Medications
• Anxiety or mood concerns

It is more useful to understand why sleep is disrupted rather than automatically assuming magnesium is the answer.

Magnesium, Muscles and Metabolic Health

Magnesium is involved in normal muscle function and glucose metabolism.

It is often considered for muscle cramps, tension and exercise recovery, but cramps can also be influenced by hydration, other electrolytes, iron status, medications, circulation and training load.

Magnesium has also been studied in relation to insulin resistance, prediabetes and type 2 diabetes. Some research suggests supplementation may improve certain metabolic markers in selected people, but results are not consistent across all studies.

For metabolic health, magnesium should be considered one part of a broader approach that includes balanced nutrition, adequate protein and fibre, regular movement, resistance exercise and healthy sleep.

Start With Magnesium-Rich Foods

Food should provide the foundation wherever possible.

Good sources include:

• Pumpkin and chia seeds
• Almonds and cashews
• Spinach and leafy greens
• Lentils, chickpeas and beans
• Edamame
• Avocado
• Tahini
• Whole grains
• Dark chocolate

A simple goal is to include leafy greens + nuts or seeds + legumes or whole grains most days.

Do You Need a Supplement?

Not everyone needs supplemental magnesium.

Supplementation may be considered when dietary intake is low or there is a specific clinical reason for using it.

The form also matters. Magnesium glycinate, citrate, L-threonate, taurate and oxide have different characteristics and may be used for different reasons.

Medication use and kidney function should also be considered before therapeutic supplementation.

The Takeaway

Magnesium is an important nutrient, but symptoms such as fatigue, anxiety, poor sleep or muscle cramps should not automatically be labelled as magnesium deficiency.

A better question is:

What may be contributing to these symptoms, and could magnesium be one part of the picture?

At ATUNE Health Centres, naturopathic care can assess diet, lifestyle, symptoms, medications and relevant pathology as part of a broader health assessment, while working alongside medical and allied-health care where appropriate.

References

National Health and Medical Research Council. (2006). Nutrient reference values for Australia and New Zealand including recommended dietary intakes.

National Institutes of Health, Office of Dietary Supplements. (2025). Magnesium: Fact sheet for health professionals.

Pickering, G., et al. (2020). Magnesium status and stress: The vicious circle concept revisited. Nutrients, 12(12), 3672.

Arab, A., et al. (2023). The role of magnesium in sleep health: A systematic review of available literature. Biological Trace Element Research, 201, 121–128.

RN Labs. (2026, August–September). The magnesium crisis. RN Labs Newsletter.

This article is for general educational purposes and does not replace individual medical advice.

Written by:

Holly Thompson

Naturopath BHSc