10 Signs You Might Be Low in Magnesium (And What to Do About It)
**Nearly half of American adults and children aren't getting enough magnesium.** Research shows that 48% of people fall short of the recommended daily intake, yet most have no idea they're deficient. Magnesium supports energy metabolism, nervous system function, muscle relaxation, and bone health. When you don't get enough, your body sends signals—but they're easy to miss.
Why does magnesium deficiency go undiagnosed so often? Because serum blood tests don't reflect what's happening inside your cells, where more than 99% of your body's magnesium lives. You can be running low and your standard lab work will look normal.
Here's what to watch for, and what you can do about it.
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1. You're Tired All the Time
Magnesium plays a role in producing ATP—the energy molecule that powers every cell in your body. When magnesium levels drop, ATP production suffers, leaving you feeling drained even after a full night's sleep.
If you're constantly reaching for caffeine just to function, and you still feel sluggish by midday, low magnesium could be part of the problem.
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2. Muscle Cramps and Spasms
That charley horse that wakes you up at 3 AM? Low magnesium might be the cause. Magnesium helps muscles relax after they contract. Without enough, your muscles stay tense, leading to painful cramps, spasms, and twitches.
These cramps show up most often in the legs, calves, and feet—especially at night.
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3. Restless Legs at Night
If you've ever felt that uncomfortable, crawling sensation in your legs when you're trying to fall asleep—the kind that makes you want to move constantly—you're not alone. Lower magnesium levels have been linked to more severe cases of restless legs.
Some research suggests pairing magnesium with vitamin B6 may help support comfort during those restless nights, though more studies are needed.
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4. Trouble Falling or Staying Asleep
Magnesium supports the body's natural production of GABA, a neurotransmitter that helps your nervous system wind down. It also plays a role in regulating melatonin, the hormone that signals your body it's time to sleep.
A 2021 study found that higher magnesium levels are associated with longer, better-quality sleep and less daytime fatigue. In older adults, magnesium supplementation helped people fall asleep faster and wake feeling more rested.
If you lie awake staring at the ceiling or wake up multiple times during the night, magnesium deficiency might be a contributor.
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5. Mental Fog and Poor Focus
Magnesium is essential for nerve signaling and brain function. When levels drop, you might notice difficulty concentrating, memory lapses, or just feeling mentally "off."
Some research links low magnesium to apathy—a feeling of mental numbness or lack of motivation—though more studies are needed to fully understand this connection.
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6. Mood Shifts and Irritability
A 2023 systematic review found an association between magnesium supplementation and improved mood in people experiencing low mood. Magnesium helps regulate neurotransmitters that influence how you feel, including serotonin and GABA.
If you've noticed you're more irritable, anxious, or emotionally flat lately, it's worth considering whether your magnesium intake is where it should be.
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7. Frequent Headaches
Magnesium helps regulate nerve function and blood vessel constriction. People with low magnesium levels may experience more frequent headaches or tension in the head and neck.
While magnesium alone won't solve every headache, it can play a supportive role in nervous system comfort.
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8. High Blood Pressure
Magnesium helps relax blood vessels and supports healthy blood pressure. Studies suggest that inadequate magnesium intake is linked to higher blood pressure over time.
If your blood pressure readings have been creeping up and you're looking for natural ways to support cardiovascular health, magnesium-rich foods or supplementation might help—always talk to your doctor first.
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9. Weak or Brittle Bones
Most people think of calcium when they think of bone health, but magnesium matters just as much. Magnesium helps your body absorb calcium and supports bone density.
Research shows that people with low magnesium intake are at higher risk for weakened bones over time. Animal studies and human trials both support the idea that magnesium helps improve calcium absorption and bone strength.
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10. Heart Rhythm Irregularities
Magnesium plays a critical role in heart muscle function and electrical signaling. Severe magnesium deficiency can contribute to irregular heartbeat, palpitations, or abnormal heart rhythms.
If you've noticed your heart feels like it's skipping beats or racing for no clear reason, see a healthcare provider—and mention magnesium as part of the conversation.
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Why Are So Many People Low in Magnesium?
Even if you eat a relatively balanced diet, several factors can put you at risk for deficiency:
- **Processed foods:** Refining grains removes most of their magnesium. White bread, pasta, and packaged snacks are low in this essential mineral.
- **Chronic health conditions:** Diabetes, celiac disease, Crohn's disease, and chronic diarrhea can all interfere with magnesium absorption.
- **Certain medications:** Diuretics, proton pump inhibitors (PPIs), and some antibiotics can deplete magnesium over time.
- **Alcohol use:** Excessive alcohol consumption increases magnesium loss through the kidneys.
- **Soil depletion:** Modern farming practices have reduced the magnesium content in crops compared to decades ago.
A 2018 study published in *Open Heart* called subclinical magnesium deficiency "a principal driver of cardiovascular disease and a public health crisis." The authors noted that because serum magnesium doesn't reflect intracellular levels, most cases go undiagnosed.
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How Much Magnesium Do You Need?
The Recommended Dietary Allowance (RDA) for magnesium varies by age and sex:
- **Adult men (19-30):** 400 mg/day
- **Adult women (19-30):** 310 mg/day
- **Adult men (31+):** 420 mg/day
- **Adult women (31+):** 320 mg/day
- **Pregnant women:** 350-400 mg/day
- **Lactating women:** 310-360 mg/day
Children and teens have lower requirements, ranging from 30 mg (infants) to 410 mg (teen boys).
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What to Do If You Think You're Low
1. Eat Magnesium-Rich Foods
The best sources of magnesium include:
- **Seeds:** Pumpkin seeds, chia seeds, flaxseeds
- **Nuts:** Almonds, cashews, peanuts
- **Leafy greens:** Spinach, kale, Swiss chard
- **Whole grains:** Brown rice, quinoa, oats, whole wheat
- **Legumes:** Black beans, chickpeas, lentils
- **Fish:** Salmon, mackerel, halibut
- **Dark chocolate:** 70% cacao or higher (yes, really)
A handful of pumpkin seeds or a serving of spinach can give you a solid magnesium boost.
2. Consider Topical Magnesium
While oral magnesium supplements are the most common option, some people prefer topical application—especially if they experience digestive side effects from oral supplements.
Topical magnesium chloride can be absorbed through the skin and applied directly to areas where you need support most: restless legs, tense muscles, or as part of a calming bedtime routine.
That's where **Dr. Doug's Magnesium Balm** comes in.
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A Topical Magnesium Solution That Actually Absorbs
We created our Magnesium Balm because oral magnesium doesn't work for everyone. Some people experience digestive discomfort. Others just want a targeted approach—something they can rub on their legs before bed or massage into sore muscles after a long day.
Our balm combines **magnesium chloride** (the form used in topical applications) with organic coconut oil, olive oil, beeswax, shea butter, and calming lavender essential oil. The beeswax locks moisture in while keeping outside irritants out—supporting your skin's natural barrier while delivering magnesium where you need it.
How to use it:
Start small. A little goes a long way. Take a pea-sized amount. Warm it between your palms. Rub it gently into the dry area—your legs, feet, back, or shoulders. At first you'll feel the organic oils, but the balm is formulated to absorb completely. That's where the magic happens. No greasy film. If it feels too heavy, or you still feel the oils after it's massaged in, you may have used too much.
Apply 20-30 minutes before bed to support relaxation and restful sleep. Many people use it on their legs to soothe that restless, uncomfortable feeling at night.
Consistency Matters
Although many people notice a difference from night one, like most natural approaches, this isn't an instant fix. Give it a week or two of consistent use to see the full effect. Many people report that their legs feel less restless, their muscles feel less tense, and they fall asleep more easily after making it part of their nightly routine.
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Our Philosophy: Medical Brain + Parent Heart
We're Doug & Natalie—a neurologist-and-adventure-athlete and a biotech-professional-turned-wellness-advocate. We created Dr. Doug's Balms because we wanted something radically simple that actually works.
If you can't read the ingredient list out loud in one breath, it's probably doing too much.
Our Magnesium Balm uses just six ingredients: organic coconut oil, organic olive oil, organic beeswax, organic shea butter, magnesium chloride, and organic lavender essential oil. That's it. No mystery additives. No synthetic fragrances. Just clean, effective ingredients that support your body's natural processes.
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Start Paying Attention to Your Body's Signals
Magnesium deficiency is one of the most underdiagnosed nutrient shortfalls in modern medicine. The signs are subtle—fatigue, muscle cramps, restless legs, trouble sleeping—but they add up.
If you recognize yourself in any of these ten signs, it's worth having a conversation with your doctor. You can also start incorporating more magnesium-rich foods into your diet and consider topical magnesium as a supportive tool.
Your body is trying to tell you something. Sometimes all it needs is a little magnesium.
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Frequently Asked Questions
Can you test for magnesium deficiency?
Standard blood tests measure serum magnesium, but since more than 99% of your body's magnesium is stored inside cells, serum tests don't always reflect true deficiency. Your doctor can order a red blood cell (RBC) magnesium test for a more accurate picture, but many cases are diagnosed based on symptoms and dietary intake.
What's the difference between oral and topical magnesium?
Oral magnesium (pills, powders, gummies) is absorbed through the digestive system. It's effective but can cause digestive side effects like diarrhea or stomach upset in some people. Topical magnesium (oils, balms, sprays) is absorbed through the skin and bypasses the digestive system entirely, making it a gentler option for targeted support.
How long does it take for magnesium to work?
Your body starts absorbing magnesium within a few hours, but it may take a couple of weeks to notice improvements in sleep, muscle comfort, or energy levels. Consistency is key—take it at the same time each day for the best results.
Are there any side effects of too much magnesium?
Taking more than 350 mg of supplemental magnesium per day can cause diarrhea, nausea, and abdominal cramps. Topical magnesium is generally well-tolerated since it bypasses the digestive system, but if you're using both oral and topical forms, keep track of your total intake.
Can magnesium help with anxiety?
Some research suggests that magnesium supplementation may help support a sense of calm and reduce feelings of stress. Magnesium helps regulate GABA and cortisol—two key players in how your nervous system responds to stress. While it's not a substitute for mental health treatment, it can be a supportive tool.
What foods are highest in magnesium?
Roasted pumpkin seeds top the list, followed by chia seeds, almonds, cashews, spinach, black beans, and dark chocolate. One ounce of pumpkin seeds contains about 150 mg of magnesium—nearly 40% of the daily recommended intake for adult women.
Is it better to take magnesium in the morning or at night?
If you're taking magnesium for sleep support, take it 30-60 minutes before bed. If you're taking it for general health, any time of day works—just be consistent. Topical magnesium balm is best applied before bed for relaxation and restful sleep.
Can pregnant women use magnesium?
Yes—pregnant women actually need more magnesium than non-pregnant adults (350-400 mg/day). Many prenatal vitamins include magnesium. If you're considering topical magnesium during pregnancy, check with your healthcare provider first, though it's generally considered safe when used as directed.
Does magnesium interact with medications?
Magnesium can interact with certain medications, including antibiotics, diuretics, and proton pump inhibitors (PPIs). If you take prescription medications, talk to your doctor before starting magnesium supplements.
Can kids use topical magnesium?
Yes. We offer **Magnesium Balm for Kids**, which is the same trusted formula in parent-friendly labeling—so families know it's safe for children. It can help support a calming bedtime routine and soothe restless legs in kids.
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Ready to Try It?
If you're tired of lying awake with restless legs, waking up with muscle cramps, or just feeling run-down all the time, it might be time to give magnesium a try.
Our **Magnesium Balm** is designed for real life—easy to use, effective, and made with ingredients you can actually pronounce.
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About the Author
Dr. Doug Strobel, MD
Dr. Doug Strobel is a board-certified neurologist and adventure athlete who formulated Dr. Doug's Miracle Balms to solve real-life challenges faced during ultra-endurance races. Combining medical expertise with a passion for clean, effective skincare, Dr. Doug created products he trusts for his own family—because if it's not safe enough for his kids, it doesn't go in the jar.
His background as both a neurologist and an endurance athlete gives him a unique perspective on how the body works under stress, how magnesium supports nervous system function, and what people really need to feel their best.