Magnesium Matters: Why You Need It & How to Choose the Best Type for You?
- Haseeb Ilyas
- May 17, 2025
- 10 min read
Updated: Sep 10, 2025
Often called the "relaxation mineral", magnesium plays a vital role in nearly every aspect of health, yet many people overlook its importance. Despite being the fourth most abundant mineral in the body, deficiency remains a global health concern. In this article, we will explore what magnesium does, why it matters, the best food sources and how to choose the right form of supplement for your needs.
What is Magnesium?
Magnesium (Mg) is and essential mineral and electrolyte involved in over 600 enzymatic reactions in the body, far more than the 300 we once thought!
It is crucial for:
Energy production (ATP synthesis)
Muscle contraction and relaxation
Healthy nerve signalling
Protein and DNA/RNA synthesis
Blood pressure and blood sugar regulation
Immune function and stress response
Proper vitamin D activation (Cepeda et al., 2025).
About 50-60% of magnesium is stored in the bones, while the rest resides in muscles and soft tissues. Less than 1% circulates in the blood, making standard serum blood test a poor measure of total magnesium status. A more accurate assessment is red blood cell (RBC) magnesium test, which measures magnesium inside your cells. This gives a better picture of your your long-term magnesium status and tends to correlate more closely with symptoms.
Top Health Benefits of Magnesium
Supports Cardiovascular Health
Magnesium helps keep the heart strong an steady by regulating muscle contractions, maintaining healthy blood pressure and preventing calcification int he arteries. Higher magnesium intake is linked to a significantly lower risk of heart disease and stroke (Zhao et al., 2019).
Improves Sleep & Reduces Stress
Magnesium calms the nervous system by boosting GABA, the neurotransmitter that promotes restful sleep. A 2020 review by Pickering et al. suggested that stress may deplete magnesium, therefore increasing susceptibility to stress and depression. Supplementing with the right form of magnesium can ease insomnia, lower anxiety and help the body unwind after a stressful day.
Enhances Muscle Recovery & Performance
Athletes and active individual often need extra magnesium because it supports energy production, reduces cramps and help muscles recover faster. It helps move blood sugar into your muscles and dispose of lactate, which can build up during exercise and cause fatigue. Magnesium is also lost through sweat, making it especially important during intense exercise (Tarsitano et al., 2024).
Promotes Bone Health
Since 50-60% of magnesium is stored in bones, it works alongside calcium and vitamin D to keep bones dense and strong. Low magnesium levels are linked to a higher risk of osteoporosis, especially in older adults (Rondanelli et al., 2021).
Boosts Cognitive Function
Magnesium supports cognitive function by reducing brain inflammation and oxidative stress. When it comes to brain health, magnesium L-threonate is considered the most effective form, as it is specifically designed to cross the blood-brain barrier, making it highly beneficial for enhancing cognitive function, learning, focus and memory (Patel et al., 2024).
Regulates Blood Sugar & Insulin
Around 48% of people with type2 diabetes have low magnesium levels, which can interfre with healthy blood sugar regulation. Studies also show that higher magnesium intake is linked to a reduced risk of developing type 2 diabetes. Supplementing with magnesium has been found to improve insulin sensitivity, an essential factor in maintaining stale blood sugar (Hruby et al., 2017).
Reduces Migraines & Headaches
Research shows that magnesium can lower the frequency and intensity of migraines by relaxing blood vessels, calming nerve overexcitabily and easing muscle tension (Dominguez et al., 2025).
Eases PMS & Hormonal Imbalances
Some research suggests that magnesium supplementation help relieve PMS symptoms and other conditions such as menstrual cramps and migraine attacks. This may be because magnesium levels fluctuate through the menstrual cycle, worsening PMS symptoms in those with a deficiency (Parazzini et al., 2017).
Strengthens Immunity
Studies indicate that magnesium plays a key role in immune regulation by modulating inflammation and supporting the activity of immune cells. Research also suggests that magnesium helps prime the immune system, enhancing the ability of T cells to fight infections and even detect and target cancer cells( Kingsland, 2022).
Supports Detoxification & Antioxidant Defence
Magnesium is essential for glutathione production, the body's master antioxidant, which protects against oxidative stress and supports liver detox pathways.
Symptoms of Magnesium Deficiency
Because magnesium is required for such a wide range of enzymatic processes throughout the body, deficiency can manifest in numerous ways.
Early sings may include:
Fatigue, weakness
Loss of appetite
Headaches or migraines
Nausea
More advanced deficiency can cause:
Anxiety, irritability, sensitivity to stress
Muscle cramps, spasms, or twitching
Tingling, numbness
Sleep difficulties
Palpitations, irregular heartbeat
High blood pressure
Asthma or breathing difficulties
Causes of Magnesium Deficiency
The most common cause of magnesium deficiency is simply not getting enough from the diet. However, several other factors can contribute to deficiency, including:
Chronic stress - stress hormones increase magnesium loss through urine.
Older age - absorption decreases with age, while needs often increase.
Type 2 diabetes - high blood sugar and insulin resistance cause greater magnesium loss.
Excess alcohol - interferes with absorption and increases excretion.
High caffeine intake - promotes urinary magnesium loss.
Certain medications - such as diuretics, proton pump inhibitors (PPIs) and some antibiotics.
Digestive disorders - like Crohn’s disease, celiac disease or frequent diarrhoea which reduce absorption.
Aluminium exposure - aluminium competes with magnesium for absorption in the gut and may also increase urinary excretion, gradually lowering magnesium levels in the body (DiNicolantonio et al., 2018).
Soil depletion and processing - Modern farming has reduced magnesium levels in soil, causing even fresh produce to contain less than in the past. Between 1940 and 1991, magnesium in vegetables dropped by 23% and remains about 10% lower than 1940 levels (Mayer et al., 2021). Processing and refining foods can remove up to 80% of magnesium.
Foods Rich in Magnesium
Dark leafy greens – spinach, kale, Swiss chard
Nuts & seeds – pumpkin seeds, almonds, cashews, sunflower seeds, flax
Whole grains & legumes – brown rice, oats, quinoa, beans, lentils, chickpeas
Avocado & bananas
Dark chocolate & cocoa powder
Fish – halibut, mackerel
Plant-based milks & yogurt
Due to soil depletion and food processing, even a good diet may not provide enough magnesium. Only 30–40% of dietary magnesium is absorbed, and anti-nutrients like phytic acid (in grains, nuts, seeds) can reduce absorption further.
How Much Magnesium Do You Need?
The Recommended Dietary Allowance (RDA) for Magnesium are (NIH, 2022):
Men 19–30 years: 400 mg/day
Men 31+ years: 420 mg/day
Women 19–30 years: 310 mg/day
Women 31+ years: 320 mg/day
Pregnant Women: 350 -360 mg/day
Breastfeeding Women: 310-320mg/day
Adverse Effects and Intractions
Although magnesium is usually well tolerated, high doses can cause gastrointestinal symptoms, including diarrhoea, nausea and vomiting. In rare cases, large amounts of magnesium can cause magnesium toxicity.
Further, taking magnesium at the same time as certain medication can affect how well the drugs work. For example, magnesium may reduce the absorption of some antibiotics, bisphosphonates, calcium channel blockers and muscle relaxants. Conversely, medications that reduce urinary excretion, such as diuretics or calcitonin, may increase magnesium levels in the blood and magnesium should therefore be taken at a different times than these medications (Grober, et al. 2015).
Magnesium Supplements: Which Form is Right for You?
Not all magnesium supplements are created equal. Different forms of magnesium are absorbed differently and may target specific health needs, so it’s important to choose the type that best supports your goals
Magnesium citrate
This type of magnesium is a form of magnesium combined with citric acid, knows for its high bioavailability, meaning it’s more easily absorbed than many other forms. Because it has a mild laxative effect, magnesium citrate is often recommended for supporting gut health, particularly for those dealing with chronic constipation. It works by drawing water into the intestines, softening stools and promoting regular bowel movements.
Magnesium Oxide
Magnesium oxide is one of the most commonly available magnesium supplement. It has a low bioavailability, meaning the body absorbs it less efficiently compared to other forms. Despite this, it is widely prescribed and found on store shelves because it is inexpensive to produce. Its primary uses include relieving constipation and acting as an antacid for heartburn and indigestion. Some research suggest a potential benefit for migraine prevention, though higher doses may be needed due to its lower absorption (Karimi et al., 2021).
Magnesium glycinate/bisglycinate
Magnesium glycinate is a form of magnesium bound to the amino acid glycine. This combination makes it highly absorbable and gentle on the stomach, while also supporting relaxation, nervous system balance and better sleep quality thanks to glycines natural calming effects. it is often chosen by people with sensitive digestion or those looking for stress relief and restful sleep. It is also less likely to cause gastrointestinal discomfort compared to other forms (Cepeda et al., 2025).
Magnesium bisglycinate is very similar, but the magnesium is bound to two glycine molecules, which may further enhance absorption and bioavailability. This form is also prized for its muscle-relaxing properties, making it an excellent choice for people dealing with tension, cramps or difficulty sleeping.
In practice, both forms are excellent for sleep, relaxation and overall nervous system support, with bisglycinate offering a slight potential edge in bioavailability and muscle relaxation.
Magnesium malate
Magnesium malate is a form of magnesium bound to malic acid, a natural compound found in fruits like apples and cherries that gives them their tart flavour. What sets it apart from other forms is its role in energy production—malic acid is a key player in the Krebs cycle, the body’s process of generating cellular energy. This makes magnesium malate especially useful for supporting energy levels and reducing fatigue. Research also suggests it may help ease muscle pain and tenderness, particularly in people with fibromyalgia.
Magnesium taurate
Magnesium taurate (or magnesium acetyl taurate) combines magnesium with the amino acid taurine, which supports cardiovascular and neurological health. This form may help lower blood pressure and reduce the risk of heart disease. Like magnesium L-threonate, it can also cross into the brain, potentially supporting mood, anxiety, and depression symptoms (Shrivastava et al., 2018).
Magnesium threonate
This form of magnesium is bound to threonic acid, a metabolite of vitamin C. Its standout feature is the ability to cross the blood-brain barrier, which may support cognitive and neurological health, particularly in older adults. This form may help with brain function, memory, and neurotransmitter balance, potentially reducing symptoms like anxiety, brain fog, and insomnia. It also has high absorption and retention (Sherrell, 2024).
Magnesium chloride
Magnesium chloride is a combination of magnesium and chloride that is highly absorbable. Orally, it can be used for dietary supplementation and as a mild laxative, particularly for those with digestive issues. Animal studies suggest it may also reduce inflammation, benefiting liver health and markers linked to diabetes, certain cancers, and fatty liver disease. Topically, magnesium chloride is popular for muscle relaxation and chronic pain relief, often applied as magnesium oils or bath flakes.
Magnesium sulfate (Epsom salts)
Commonly known as Epsom salt, is a combination of magnesium, sulfur, and oxygen. It is most often used topically in baths to promote muscle relaxation, ease soreness, and reduce tension. While it can also be taken orally as a laxative, its primary use is for external application, where the magnesium is absorbed through the skin, supporting relaxation and recovery after exercise or stress.
Magnesium carbonate
Magnesium carbonate is a common, inexpensive form of magnesium often found in low-quality supplements. It has poor bioavailability (only about 6% absorbed) and can cause digestive upset or diarrhoea when taken in higher doses (Blancquaert et al., 2019).
Magnesium stearate
This form or magnesium is not a form for supplementation; it’s usually used as a flow agent or coating in capsules. It does not contribute to magnesium intake and can sometimes trigger allergic reactions or digestive issues in sensitive individuals (Hansen, 2019).
Best Practices for Supplementing
Take magnesium in the evening for sleep and relaxation benefits.
Split doses (morning & evening) if taking higher amounts.
Pair with vitamin D and zinc for better absorption and synergy.
Avoid taking magnesium at the same time as high-dose calcium or iron, which compete for absorption/or with prescription medication.
For digestive sensitivity, try topical magnesium sprays or baths.
Always read the ingredient label carefully. Opt for magnesium supplements that contain only the active magnesium compound and the capsule shell. Avoid products with unnecessary fillers, binders, or artificial additives, as these can reduce purity and may cause sensitivities.
Key Takeaways
Magnesium is essential for energy, heart health, stress resilience, sleep, and more.
Most people fall short, consuming well below the optimal range.
A magnesium-rich diet + high-quality supplements can help restore balance.
Choose the right form based on your needs (e.g., glycinate for sleep, citrate for digestion, threonate for brain health).
Managing stress, improving digestion, and supporting absorption (via vitamin D, reducing processed foods) makes a big difference.
Magnesium truly is one of the most powerful yet underrated minerals for long-term health and wellbeing.
References
Blancquaert, L., Vervaet, C. & Derave, W. (2019). Predicting and Testing Bioavailability of Magnesium Supplements. Nutrients. 11(7): 1663. https://doi.org/10.3390/nu11071663
Cepeda, V., Rodenas-Munar, M., Garcia, S., Bouzas, C. & Tur, J. A. (2025). Unlocking the Power of Magnesium: A Systematic Review and Meta-Analysis Regarding Its Role in Oxidative Stress and Inflammation. Antioxidants. 14(6). https://doi.org/10.3390/antiox14060740
Dominguez, L. J., Veronese, N., Sabico, S., Al-Daghri, N. M. & Bargallo, M. (2025). Magnesium and Migraine. Nutrients. 17(4), 725. https://doi.org/10.3390/nu17040725
DiNicolantonio, J. J., O’Keefe, J. H. & Wilson, W. (2018). Subclinical magnesium deficiency: a principal driver of cardiovascular disease and a public health crisis. Open Heart. 5(1):e000668.
Grober, U., Schmidt, J. & Kisters, K. (2015). Magnesium in Prevention and Therapy. Nutrients. 7(9);8199-8226. https://doi.org/10.3390/nu7095388
Hansen, K. (2019, November 23). Everything You Should Know About Magnesium Stearate. https://www.healthline.com/health/magnesium-stearate
Hruby, A., Guasch-Ferre, M., Bhupathiraju, S. N., Manson, J.. E., Willett, W. C., McKeown, N. M. & Hu, F. B. (2017). Magnesium Intake, Quality of Carbohydrates, and Risk of Type 2 Diabetes: Results From Three U. S. Cohorts. Diabetes Care. 40(12): 1695-1702. https://doi.org/10.2337/dc17-1143
Karimi, N., Razian, A. & Heidari, M. (2021). the efficacy of magnesium oxide and sodium valproate in prevention of migraine headache: a randomized, controlled, double-blind, crossover study. Acta Neurologica Belgica. 121(1):167-173. https://doi.org/10.1007/s13760-019-01101-x
Kingsland, J. (2022, January 24). Magnesium may prime the immune system to fight cancer and infections. Medical News Today. https://www.medicalnewstoday.com/articles/magnesium-may-prime-the-immune-system-to-fight-cancer-and-infections
Mayer, A. M. B., Trenchard, L. & Rayns, F. (2021). Historical changes in the mineral content of fruit and vegetables in the UK from. 1940 to 2019: a concern for human nutrition and agriculture. International Journal of Food Sciences and Nutrition. 73(3):315-326. https://doi.org/10.1080/09637486.2021.1981831
National Institutes of Health. (2022). Magnesium. https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/
Parazzini, F., Di Martino, M. & Pellegrino, P. (2017). Magnesium in the gynecological practice: a literature review. Magnesium Research. 30(1): 1-7. https://doi.org/10.1684/mrh.2017.0419
Patel, V., Akimbekov, N. .S., Grant, W. B., Dean, C., Fang, X. & Razzaque, M. (2024). Neuroprotective effects of magnesium: implications for neuroinflammation and cognitive decline. Frontiers in Endocrinology. 2:232-238. https://doi.org/10.3389/fendo.2024.1406455
Pickering, G., Mazur, A., Trousselard, M., Bienkowski, P., Yaltsewa, N., Amessou, M., Noah, L. & Pouteau, E. (2020). Magnesium Status and Stress: The Vicious Circle Concept Revisited. Nutrients. 12(12):3672. https://doi.org/10.3390/nu12123672
Rondanelli, M., Faliva, M. A., Tartara, A., Gasparri, C., Perna, S., Infantino, V., Riva, A., Petrangolini, G. & Peroni, G. (2021). An update on magnesium and bone health. Biometals. 34(4): 715-736. https://doi.org/10.1007/s10534-021-00305-0
Sherrell, Z. (2024, February 16). What to know about magnesium threonate. Medical News Today. https://www.medicalnewstoday.com/articles/magnesium-threonate
Shrivastava, P., Choudhary, R., Nirmalkar, U., Singh, A., Shree, J., Vishwakarma, P. K. & Bodakhe, S. H. (2018). Magnesium taurate attenuates progression of hypertension and cardiotoxicity against cadmium chloride-induced hypertensive albino rats. Journal of Traditional and Complementary Medicine. 9(2):119-123. https://doi.org/10.1016/j.jtcme.2017.06.010
Tarsitano, M. G., Quinzi, F., Folino, K., Greco, F., Oranges, F. P., Cerulli, C. & Emerenziani, G. P. (2024). Effects of magnesium supplementation on muscle soreness in different type of physical activities: a systematic review. Journal of Translational Medicine. 22:629. https://doi.org/10.1186/s12967-024-05434-x
Zhao, B., Hu, L., Dong, Y., Xu, J., Wei, Y., Yu, D., Xu, J. & Zhang, W. (2019). The Effect of Magnesium Intake on Stroke Incidence: A Systematic Review and Meta-Analysis With Trial Sequential Analysis. Frontiers in Neurology. 10:852. https://doi.org/10.3389/fneur.2019.00852
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