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It’s amazing how much one nutrient can influence your health. Magnesium is involved in hundreds of processes throughout the body, including muscle and nerve function, blood pressure regulation, blood glucose control, and bone health.
Many people consume less magnesium than recommended, although that isn’t necessarily the same as having a clinical magnesium deficiency. True deficiency is uncommon in otherwise healthy people, but certain health conditions, medications, and lifestyle factors can increase the risk. Here’s what magnesium deficiency can look like, who is most vulnerable, and how you can get more magnesium through food.
Why Is It So Hard to Get Enough Magnesium?
There are several reasons someone might not get enough magnesium or could be at greater risk of developing a deficiency.
Diet is one factor. Magnesium is naturally found in foods such as dark leafy greens, nuts, seeds, legumes, whole grains, and some types of fish. Diets that contain relatively few of these foods may provide less magnesium than recommended.
Low dietary intake isn’t the only concern. According to the NIH Office of Dietary Supplements, gastrointestinal diseases that interfere with absorption, type 2 diabetes, long-term heavy alcohol use, and certain medications can increase the risk of magnesium deficiency. Older adults are also more vulnerable because magnesium intake and intestinal absorption tend to decline with age while losses through the kidneys can increase.
32 Signs and Health Issues That May Be Associated With Low Magnesium
Magnesium is an essential mineral involved in muscle and nerve function, blood glucose and blood pressure regulation, and numerous other processes throughout the body. However, magnesium deficiency doesn’t always produce obvious symptoms in its early stages.
According to the NIH Office of Dietary Supplements, early signs of magnesium deficiency can include loss of appetite, nausea, vomiting, fatigue, and weakness. As deficiency becomes more severe, additional neurological, muscular, and cardiovascular symptoms can develop.
Neurological Symptoms
Magnesium plays an important role in normal nervous system function. According to the NIH Office of Dietary Supplements, significant magnesium deficiency can cause neurological symptoms including personality changes, numbness, tingling, muscle contractions, cramps, and seizures. Researchers have also studied magnesium in relation to mood and sleep, although these symptoms are much less specific.
1. Irritability and Mood Swings: Significant magnesium deficiency can cause personality changes. Magnesium status has also been studied in relation to anxiety and mood, although irritability, anxiety, or depression alone don’t indicate a deficiency.
2. Fatigue: Persistent tiredness and fatigue are recognized symptoms of magnesium deficiency.
3. Insomnia: Magnesium has been studied for its potential role in sleep. A 2024 systematic review found generally positive results in several trials, but the studies were small and varied considerably. Insomnia has many possible causes and isn’t considered a reliable sign of magnesium deficiency on its own.
4. Memory Issues and Brain Fog: Magnesium is important for normal nervous system function, but forgetfulness and difficulty concentrating are nonspecific and shouldn’t be assumed to indicate low magnesium.
Muscular Symptoms
Magnesium plays a critical role in normal muscle and nerve function. As magnesium deficiency progresses, recognized symptoms can include muscle contractions, cramps, numbness, and tingling.
5. Muscle Cramps and Spasms: Muscle cramps and contractions can occur with magnesium deficiency because magnesium is involved in normal nerve and muscle function.
6. Tremors: Involuntary muscle movements can occur when electrolyte balance is disrupted, although tremors aren’t specific to magnesium deficiency.
7. Weakness: Weakness is a recognized early symptom of magnesium deficiency.
8. Tingling or Numbness: Numbness and tingling can occur as magnesium deficiency becomes more pronounced, although these sensations have many other possible causes.
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Cardiovascular Symptoms
Magnesium is important for normal cardiovascular function and maintaining a steady heart rhythm. Severe magnesium deficiency can cause abnormal heart rhythms, while magnesium intake has also been studied in relation to blood pressure and cardiovascular health.
9. Arrhythmias: Severe magnesium deficiency can cause abnormal heart rhythms.
10. Hypertension: Magnesium plays a role in blood pressure regulation, and research has found associations between magnesium intake and blood pressure. However, hypertension isn’t by itself a sign of magnesium deficiency.
11. Palpitations: Abnormal heart rhythms caused by significant magnesium deficiency may sometimes be experienced as a racing, pounding, or skipped heartbeat. Because palpitations have many potential causes, new or persistent symptoms should be medically evaluated.
Cognitive Symptoms
Magnesium is involved in normal brain and nervous system function, but cognitive and psychological symptoms are generally nonspecific:
12. Difficulty Concentrating: Problems concentrating or “brain fog” have many potential causes. While magnesium is important for neurological function, difficulty concentrating alone doesn’t indicate a deficiency.
13. Poor Memory Retention: Magnesium plays a role in brain function, but poor memory isn’t considered a specific sign of magnesium deficiency.
14. Anxiety or Panic Attacks: Magnesium has been investigated in relation to anxiety. A 2024 systematic review of clinical trials found improvement in at least one anxiety measure in five of seven studies, but the studies were generally small and varied substantially in their populations, magnesium formulations, and doses. Anxiety or panic attacks shouldn’t therefore be assumed to result from magnesium deficiency.
Gastrointestinal Symptoms
Some gastrointestinal symptoms are recognized early signs of magnesium deficiency. According to the NIH Office of Dietary Supplements, these include loss of appetite, nausea, and vomiting.
15. Chronic Constipation: Certain forms of supplemental magnesium have a laxative effect, but constipation itself isn’t considered a reliable sign of magnesium deficiency
16. Nausea and Vomiting: Nausea and vomiting are recognized symptoms that can occur with magnesium deficiency
17. Loss of Appetite: Loss of appetite is another recognized early symptom of magnesium deficiency.
Bone and Joint Symptoms
Magnesium plays an important role in bone formation. Population studies have found associations between higher magnesium intake and greater bone mineral density, although more research is needed to determine whether magnesium supplementation can prevent or manage osteoporosis.
18. Bone Pain: Magnesium contributes to normal bone structure and mineral metabolism, but bone pain has many possible causes and isn’t considered a specific symptom of magnesium deficiency.
19. Increased Risk of Osteoporosis: Some research has found lower magnesium levels among women with osteoporosis, and inadequate magnesium may be one factor affecting bone health. However, osteoporosis has many risk factors and doesn’t necessarily indicate magnesium deficiency.
20. Joint Stiffness: Joint stiffness isn’t considered a typical sign of magnesium deficiency and can have many possible causes.
Possible Skin and Hair Symptoms
Magnesium plays a role in several processes involved in normal skin function. A 2005 clinical study found that bathing atopic dry skin in a magnesium-rich Dead Sea salt solution improved skin hydration and reduced skin roughness and redness compared with tap water. More recent research has continued to investigate magnesium’s role in skin barrier function and tissue repair. However, this doesn’t mean that common skin or hair problems are necessarily signs of magnesium deficiency.
21. Dry, Flaky Skin: Magnesium appears to play a role in normal skin barrier function and hydration, but dry or flaky skin has many potential causes and isn’t considered a specific sign of magnesium deficiency.
22. Hair Thinning or Loss: Magnesium is involved in normal cellular function and protein synthesis, but hair loss isn’t a recognized sign of magnesium deficiency and can have numerous nutritional, hormonal, genetic, and medical causes.
23. Slow Wound Healing: Magnesium is involved in biological processes related to tissue repair, but slow wound healing isn’t specific to magnesium deficiency and can have many underlying causes.
Systemic Symptoms
Some symptoms and health conditions have been studied in relation to magnesium status without necessarily being caused by magnesium deficiency:
24. Frequent Headaches or Migraines: Research has found an association between magnesium and migraine, and some clinical trials suggest magnesium supplementation may modestly reduce migraine frequency. However, frequent headaches don’t necessarily indicate magnesium deficiency.
25. Chronic Fatigue: Fatigue and weakness are recognized symptoms of magnesium deficiency, but chronic fatigue has many possible causes. Persistent fatigue shouldn’t automatically be attributed to low magnesium.
26. Cold Sensitivity: Feeling unusually cold has many possible causes and isn’t considered a typical sign of magnesium deficiency.
Immune and Hormonal Symptoms
Magnesium participates in numerous biological processes, but the following symptoms aren’t specific indicators of magnesium deficiency:
27. Frequent Infections: Magnesium is involved in normal immune function, but frequently becoming ill isn’t considered a specific sign of magnesium deficiency.
28. PMS Symptoms: Magnesium has been studied in relation to premenstrual symptoms, but the evidence is mixed. A systematic review and meta-analysis did not find a consistent association between serum or red blood cell magnesium levels and PMS. Experiencing PMS therefore shouldn’t be interpreted as evidence of magnesium deficiency.
29. Unexplained Weight Changes: Magnesium is involved in normal energy metabolism, but unexplained weight gain or loss isn’t considered a typical sign of magnesium deficiency and can have many other causes.
Advanced Deficiency Symptoms
Severe magnesium deficiency can cause serious neurological, cardiovascular, and electrolyte disturbances:
30. Seizures: Very low magnesium levels can disrupt normal nervous system activity and cause seizures.
31. Abnormal Heart Rhythms: Severe magnesium deficiency can cause potentially dangerous arrhythmias.
32. Hypocalcemia and Hypokalemia: Severe magnesium deficiency can cause low calcium and potassium levels, resulting in additional neurological, muscular, and cardiovascular complications.
Many of the symptoms and health issues on this list aren’t specific to magnesium deficiency and can have numerous other causes. Symptoms alone can’t determine magnesium status, particularly for the less-specific issues discussed above.
The Foods You Need to Start Eating Immediately
Magnesium-rich foods are one of the best ways to meet your daily magnesium needs. Incorporating foods naturally rich in magnesium can help prevent inadequate intake while providing a range of other important nutrients. Here are some great options:
Green Leafy Vegetables
Leafy greens are powerhouses of magnesium due to their chlorophyll content:
1. Spinach (78 mg per ½ cup cooked): Spinach is one of the richest magnesium sources, ideal for salads, smoothies, or cooked dishes.
2. Swiss Chard (154 mg per cup cooked): This versatile green boosts magnesium and adds a vibrant flavor to soups and stir-fries.
3. Kale (50 mg per cup raw): Kale provides magnesium along with antioxidants like vitamin C.
Nuts and Seeds
Nuts and seeds are portable, nutrient-dense snacks packed with magnesium:
4. Pumpkin Seeds (156 mg per ounce): A single handful delivers nearly half your daily magnesium needs. Add them to yogurt or salads for a satisfying crunch.
5. Almonds (77 mg per ounce): Perfect for snacking or as almond butter, they combine magnesium with healthy fats and protein.
6. Chia Seeds (111 mg per ounce): Mix chia seeds into smoothies, puddings, or baked goods to increase fiber and magnesium intake.
7. Cashews (74 mg per ounce): Cashews make a creamy addition to sauces or can be eaten roasted.
Legumes
Legumes are excellent for magnesium and fiber, supporting digestion and heart health:
8. Black Beans (60 mg per ½ cup cooked): Ideal for chili, soups, or rice dishes, black beans pack a nutritional punch.
9. Lentils (36 mg per ½ cup cooked): Lentils are a versatile base for soups or salads and provide protein alongside magnesium.
10. Chickpeas (39 mg per ½ cup cooked): A staple in hummus, chickpeas are rich in magnesium and essential minerals.
Whole Grains
Whole grains can be useful sources of magnesium. Refining grains removes the magnesium-rich germ and bran, which is why whole-grain varieties generally contain more magnesium than their refined counterparts. Go for:
11. Brown Rice (42 mg per cup cooked): Brown rice retains magnesium lost in white rice during processing.
12. Quinoa (118 mg per cup cooked): A complete protein and magnesium source, quinoa is perfect for grain bowls or salads.
13. Oat Bran (96 mg per ½ cup dry): High in magnesium, oat bran is an excellent choice for breakfast or baking.
Dairy Products
Low-fat dairy offers a modest magnesium boost along with calcium:
14. Plain Yogurt (42 mg per cup): Yogurt provides probiotics and magnesium, supporting gut health.
15. Milk (24 mg per cup): Opt for fortified milk for additional magnesium and vitamin D benefits.
Seafood
Seafood delivers magnesium alongside omega-3 fatty acids:
16. Mackerel (82 mg per 3 ounces): This fatty fish is rich in magnesium and supports heart and brain health.
17. Salmon (26 mg per 3.5 ounces): Known for its anti-inflammatory properties, salmon is a magnesium-rich protein source.
Fruits
While not as dense in magnesium as other categories, certain fruits still contribute:
18. Avocado (58 mg per fruit): Avocados are magnesium-packed and versatile, perfect for toast, salads, or guacamole.
19. Bananas (32 mg per medium banana): Bananas are convenient and rich in magnesium, potassium, and energy-boosting carbohydrates.
20. Figs (50 mg per ½ cup): Fresh or dried figs make a sweet snack rich in magnesium.
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Other Sources
These miscellaneous items round out your magnesium-rich diet:
21. Dark Chocolate (65 mg per ounce): A treat that offers antioxidants and magnesium—opt for 70% or higher cocoa.
22. Tofu (30 mg per 3.5 ounces): Tofu is a great plant-based protein source loaded with magnesium.
23. Molasses (48 mg per tablespoon): Use blackstrap molasses in baked goods or as a natural sweetener for a magnesium boost.
Tips for Maximizing Magnesium Intake
Even with magnesium-rich foods in your diet, your overall eating pattern matters. According to the NIH Office of Dietary Supplements, some of the richest dietary sources of magnesium include leafy green vegetables, legumes, nuts, seeds, and whole grains.
Choose Whole Foods: Nuts, seeds, legumes, whole grains, and leafy green vegetables are among the better dietary sources of magnesium.
Avoid Over-Reliance on Processed Foods: Refining grains removes the magnesium-rich germ and bran, substantially reducing their magnesium content.
Eat a Varied Diet: Including several different magnesium-rich foods throughout the day can make it easier to meet your daily needs.
Dietary Strategies
Ensuring an adequate intake of magnesium-rich foods is one of the most practical ways to reduce the risk of inadequate magnesium intake. Focus on these principles:
Emphasize Whole Foods: Incorporate nutrient-dense options such as green leafy vegetables, nuts, seeds, whole grains, and legumes into your meals.
Diversify Your Diet: Consuming a variety of foods helps provide magnesium along with other essential nutrients.
Plan Balanced Meals: Include sources of magnesium throughout the day. For example, pair brown rice with spinach and black beans for a magnesium-rich dish.
Supplementation
In some cases, food alone may not meet your magnesium requirements. This is especially true for individuals with higher magnesium needs or absorption challenges.
When to Consider Supplements
Certain groups have a greater risk of magnesium inadequacy or deficiency. The NIH Office of Dietary Supplements identifies people with gastrointestinal diseases, type 2 diabetes, long-term heavy alcohol use, and older adults among the groups more likely to have inadequate magnesium status.
Chronic Conditions: Gastrointestinal conditions including Crohn’s disease and celiac disease can interfere with magnesium absorption. People with type 2 diabetes may also be at greater risk of magnesium deficiency.
Older Adults: Magnesium intake and intestinal absorption tend to decrease with age, while magnesium excretion through the kidneys may increase, putting older adults at greater risk of deficiency.
Long-Term Heavy Alcohol Use: Chronic heavy alcohol use can increase the risk of magnesium deficiency through several mechanisms, including poor dietary intake, gastrointestinal problems, and increased magnesium losses.
Athletes: People who train intensely may have greater difficulty meeting magnesium needs, particularly if they have high sweat losses, restrict calories, follow weight-control diets, or otherwise have inadequate magnesium intake. Research suggests magnesium supplementation may benefit exercise performance when magnesium status is low, but it hasn’t been shown to improve performance in athletes who already get enough. Research on magnesium and exercise has highlighted these differences.
Choosing the Right Supplement
Magnesium supplements come in many forms, with differences in absorption, tolerability, and how they’re typically used. Here are four common examples:
- Magnesium Citrate: A relatively well-absorbed form that can also have a laxative effect.
- Magnesium Glycinate: A well-absorbed form that is generally well tolerated and less likely to cause gastrointestinal side effects.
- Magnesium Oxide: Contains a relatively high proportion of elemental magnesium but is less readily absorbed than some other forms. It is also used in some laxative products.
- Magnesium Sulfate: Used medically in certain situations and is also the form of magnesium found in Epsom salts.
For most people, magnesium bisglycinate is the best place to start: it’s well absorbed and gentle on the stomach. Health First Magnesium Bisglycinate 200 Supreme gives 200 mg of elemental magnesium per capsule. If staying regular is also a goal, Health First Magnesium Citrate is the better fit. For a full side-by-side of all seven forms, see 7 types of magnesium and how to use them.
Dosage Guidelines
Recommended Dietary Allowances (RDAs) describe the amount of magnesium most healthy people should aim to get each day from all sources:
| Age | Male | Female | Pregnancy | Lactation |
|---|---|---|---|---|
| 0–6 months | 30 mg* | 30 mg* | ||
| 7–12 months | 75 mg* | 75 mg* | ||
| 1–3 years | 80 mg | 80 mg | ||
| 4–8 years | 130 mg | 130 mg | ||
| 9–13 years | 240 mg | 240 mg | ||
| 14–18 years | 410 mg | 360 mg | 400 mg | 360 mg |
| 19–30 years | 400 mg | 310 mg | 350 mg | 310 mg |
| 31–50 years | 420 mg | 320 mg | 360 mg | 320 mg |
| 51+ years | 420 mg | 320 mg |
These recommendations include magnesium from food, beverages, supplements, and medications. However, the upper limit for magnesium specifically from supplements and medications is 350 mg per day for adults, unless otherwise directed by a healthcare provider. This limit does not include magnesium naturally found in food.
Lifestyle Adjustments
Simple lifestyle and dietary habits can help support adequate magnesium intake:
Prioritize Magnesium-Rich Foods
Regularly include foods such as leafy greens, legumes, nuts, seeds, and whole grains. These are among the primary dietary sources of magnesium.
Limit Heavy Alcohol Consumption
Long-term heavy alcohol use is a recognized risk factor for magnesium deficiency and can contribute to inadequate intake and increased magnesium losses.
Support Digestive Health
Conditions that interfere with nutrient absorption, including Crohn’s disease and celiac disease, can increase the risk of magnesium deficiency. People with persistent digestive symptoms or conditions that affect nutrient absorption should discuss appropriate management with a healthcare provider.
Monitoring Magnesium Levels
Assessing magnesium status isn’t always straightforward. According to the NIH Office of Dietary Supplements, serum magnesium is the most commonly used test, but blood levels don’t necessarily reflect total-body or tissue magnesium because most magnesium is stored in bones and soft tissues.
Serum Magnesium Test: This is the most commonly used test for assessing magnesium status, but it doesn’t provide a complete picture of the body’s magnesium stores.
Other Tests: Urinary magnesium, red blood cell magnesium, and magnesium loading tests may sometimes be used. However, no single method is considered completely satisfactory for assessing magnesium status, so results may need to be considered alongside symptoms, medical history, and other laboratory findings.
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Combining Nutrients for Synergy
Magnesium interacts with several other nutrients that are also important for normal health:
Vitamin D: Magnesium is involved in enzymes that metabolize vitamin D, while both nutrients contribute to bone health.
Potassium: Both magnesium and potassium are important for normal muscle, nerve, and heart function.
Calcium: Magnesium and calcium both play important roles in bone health as well as normal muscle and nerve function.
The Power of Magnesium for Your Health
Magnesium is an essential mineral involved in hundreds of processes throughout the body, from normal muscle and nerve function to maintaining a steady heart rhythm and supporting bone health.
While many people may consume less magnesium than recommended, inadequate intake isn’t necessarily the same as having a clinical magnesium deficiency. As the NIH Office of Dietary Supplements explains, symptomatic deficiency caused solely by low dietary intake is uncommon in otherwise healthy people. Certain groups are more vulnerable, particularly people with gastrointestinal diseases, type 2 diabetes, long-term heavy alcohol use, certain medication use, and older adults.
Fortunately, magnesium is widely available in foods. Leafy greens, nuts, seeds, legumes, and whole grains can all contribute meaningful amounts to your daily intake. For people who have difficulty meeting their needs through food or who are at greater risk of deficiency, supplementation may sometimes be appropriate.
If you’re experiencing persistent symptoms that could be related to magnesium deficiency, don’t assume magnesium is necessarily the cause. Many of the symptoms associated with deficiency can have other explanations, and a healthcare provider can help determine whether testing or treatment is appropriate.
Read More: 7 Types of Magnesium and How They Can Be Used to Improve Your Health
Medical Disclaimer: The author is not a licensed medical professional. The information provided is for general informational and educational purposes only and is based on research from publicly available, reputable sources. It is not intended to constitute, and should not be relied upon as, medical advice, diagnosis, or treatment. Always consult a licensed physician or other qualified healthcare provider regarding any medical condition, symptoms, or medications. Do not disregard, avoid, or delay seeking professional medical advice or treatment because of information contained herein.
A.I. Disclaimer: This article was created with AI assistance and edited by a human for accuracy and clarity.