Magnesium Deficiency: Could Low Magnesium Be Affecting Your Health?
Updated: Jul 31
Magnesium doesn't get nearly as much attention as protein, vitamin D, or omega-3s, but it should.
This remarkable mineral is involved in hundreds of processes throughout your body, helping regulate everything from muscle function and nerve signaling to energy production, sleep, heart health, and blood sugar. When magnesium levels are low, the effects can be surprisingly widespread.
The challenge is that magnesium deficiency doesn't always announce itself with one obvious symptom. Instead, it can show up in subtle ways that are easy to dismiss or blame on stress, aging, or simply being busy. Understanding magnesium's role in the body is the first step toward recognizing when it may be contributing to your overall health.
Why Is Magnesium So Important?
Magnesium is involved in more than 300 enzyme systems throughout the body, making it one of the most important minerals for overall health. It helps your muscles contract and relax, supports healthy nerve function, contributes to energy production, regulates blood sugar, maintains a normal heart rhythm, and plays an essential role in bone health.
Because magnesium is involved in so many different processes, low levels can affect multiple body systems at the same time.
Signs You May Be Low in Magnesium
Magnesium deficiency doesn't always cause dramatic symptoms right away. In fact, many people experience subtle changes that gradually become more noticeable over time.
Some of the more common signs include:
Muscle cramps
Muscle twitches
Fatigue
Weakness
Headaches
Difficulty sleeping
Loss of appetite
Nausea
In more severe cases, magnesium deficiency can contribute to numbness, tingling, abnormal heart rhythms, seizures, or low calcium and potassium levels. Fortunately, these complications are relatively uncommon and typically occur in people with significant deficiencies or certain medical conditions.
It's also important to remember that these symptoms can have many different causes. Having one or more of them doesn't automatically mean you're deficient in magnesium.
Who Is Most at Risk?
Although magnesium deficiency isn't inevitable, some people are more likely to develop low levels than others.
Your risk may be higher if you:
Have Crohn's disease, celiac disease, or another digestive disorder that affects nutrient absorption
Experience chronic diarrhea
Have type 2 diabetes
Drink alcohol excessively
Take certain medications, including some acid-reducing medications (proton pump inhibitors) or diuretics
Eat a diet consistently low in magnesium-rich foods
Over time, these factors can reduce magnesium absorption or increase the amount your body loses.
Can a Blood Test Detect Magnesium Deficiency?
Many people are surprised to learn that magnesium isn't always easy to measure.
Only about 1% of your body's magnesium is found in your bloodstream. The vast majority is stored inside your bones and cells. Because of this, a standard serum magnesium test may identify a significant deficiency, but it doesn't always reflect your body's total magnesium stores.
That's why your symptoms, medical history, diet, medications, and overall health are just as important as your lab work when evaluating magnesium status.
The Best Way to Increase Magnesium
Whenever possible, I encourage patients to get their nutrients from food first.
Many delicious whole foods are naturally rich in magnesium, including:
Pumpkin seeds
Almonds
Cashews
Spinach
Swiss chard
Black beans
Lentils
Edamame
Avocados
Dark chocolate
Whole grains
These foods don't just provide magnesium—they're also rich in fiber, antioxidants, healthy fats, and other nutrients that support overall health.
Should You Take a Magnesium Supplement?
Magnesium supplements can be helpful for some people, but they aren't necessary for everyone.
The first question isn't "Which magnesium supplement should I buy?"
It's "Why do I think I need one?"
Fatigue, headaches, constipation, poor sleep, muscle cramps, and anxiety can all have many possible causes. While magnesium may play a role, it's important to avoid assuming it's the answer without looking at the bigger picture.
If supplementation is appropriate, choosing the right form matters.
For example:
Magnesium glycinate is well absorbed and commonly recommended for people looking to support relaxation or sleep.
Magnesium citrate is also well absorbed but may loosen the bowels.
Magnesium oxide contains a higher amount of elemental magnesium but is generally absorbed less efficiently than other forms.
The best choice depends on your individual health goals and medical history.
A Functional Medicine Perspective
One of the things I love about functional medicine is that it encourages us to ask why.
Instead of automatically recommending another supplement, I want to understand what's contributing to your symptoms.
Are you eating enough magnesium-rich foods?
Is your digestive system absorbing nutrients properly?
Could stress, medications, hormone changes, or another underlying condition be affecting your health?
Sometimes magnesium is exactly what's needed.
Other times, it's simply one piece of a much larger puzzle.
💡 Dr. Stephanie's Tip: Before reaching for another supplement, take a look at what's on your plate. Small changes—like adding more leafy greens, beans, nuts, and seeds to your meals—can naturally increase your magnesium intake while improving the overall quality of your diet.
Nourish Your Body From the Inside Out
Magnesium is essential for good health, but it's only one piece of the foundation.
When you combine nutrient-dense foods, quality sleep, regular exercise, stress management, and a personalized approach to your health, you're giving your body the tools it needs to function at its best.
If you're dealing with fatigue, muscle cramps, headaches, poor sleep, constipation, or simply don't feel like yourself, I'd love to help. Together, we'll identify the underlying factors contributing to your symptoms and create a personalized plan using nutrition, acupuncture, and functional medicine to help you feel your best.
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