Introduction: Why Magnesium and Sleep Quality Are Closely Linked
Sleep is one of the most essential pillars of health, yet millions of adults struggle to fall asleep or stay asleep through the night. Among the various nutrients linked to sleep regulation, magnesium stands out as a mineral that influences calming neurotransmitters, muscle relaxation, and the body's internal clock. This article explores the science behind magnesium and sleep quality, helping you understand how diet, lifestyle, and thoughtful supplementation may support a better night's rest. You will learn practical ways to assess your own sleep patterns and nutritional needs before making informed decisions about your health.
What This Article Will Cover: From Diet to Smart Supplement Choices
We will examine how magnesium works in the body, what it does for the nervous system, why modern diets often fall short, and how different supplement forms compare. Crucially, this article takes a nutrition-first approach: food and lifestyle habits come before any discussion of pills or powders, ensuring you understand the full landscape before you consider a product.
What Is Magnesium and How Does It Relate to Sleep?
Magnesium is an abundant mineral in the body, playing a structural role in bones, teeth, and hundreds of enzyme systems. It is involved in more than 300 biochemical reactions, ranging from protein synthesis to blood pressure regulation. For sleep, magnesium contributes to processes that calm the nervous system and prepare the body for rest.
The Biological Role of Magnesium in the Nervous System
Magnesium helps regulate two key messengers in the brain: glutamate and GABA. Glutamate is an excitatory neurotransmitter; GABA is an inhibitory one. When magnesium is sufficient, it supports the activity of GABA, which reduces neuronal excitability. This biological action is why magnesium is often described as calming—it helps tone down the "fight or flight" signals that interfere with sleep onset.
The Connection Between Magnesium, Melatonin, and the Sleep-Wake Cycle
Melatonin is the hormone that signals darkness and promotes sleepiness. Magnesium influences the enzymes that help produce melatonin from serotonin. Furthermore, magnesium helps regulate the circadian rhythm by supporting the body's response to light and dark cues. While melatonin tells your brain it is time to sleep, magnesium helps your nervous system actually relax into that state.
Key Terminology: Electrolytes, Neurotransmitters, and Muscle Relaxation
As an electrolyte, magnesium carries electrical charges that support nerve impulses and muscle contraction. When magnesium levels are sufficient, muscle tissue can relax properly after contracting. A deficiency may lead to twitching, cramps, or a sensation of tension that makes it hard to settle down at night. This combination of nerve-calming and muscle-relaxing effects explains why magnesium is frequently researched within the context of sleep support.
Why Magnesium Matters for Overall Health and Wellbeing
While this article focuses on sleep, magnesium is not only a "sleep mineral." It supports myocardial function, glucose metabolism, and bone density. A healthy magnesium status contributes to daily energy production and helps the body manage physiological stress. These broader roles matter because sleep quality often reflects overall metabolic and emotional health, not just one isolated nutrient.
Beyond Sleep: Magnesium’s Role in Muscle Function, Energy, and Stress Response
Every muscle contraction, including the heartbeat, depends on magnesium. The mineral is also required for ATP production—your body's primary energy currency. When magnesium levels are low, basic cellular energy processes become less efficient. This can translate into daytime fatigue, a higher perceived exertion during physical tasks, and a diminished ability to handle stress, all of which may indirectly affect how well you sleep at night.
How Stress and Relaxation Pathways Influence Sleep Quality
Chronic stress elevates cortisol and adrenaline, hormones that keep you alert. Magnesium plays a part in tempering the stress response through the hypothalamic-pituitary-adrenal (HPA) axis. Adequate intake may support a more balanced response to daily stressors, allowing the body to transition more smoothly into a parasympathetic, or "rest-and-digest," state at bedtime.
Common Signs That Your Sleep May Be Affected by Low Magnesium
Sleep disruption alone does not automatically indicate a magnesium deficiency. However, certain symptoms may point toward low magnesium status, especially when they occur alongside daytime tension or muscle discomfort.
Restless Legs, Muscle Cramps, and Nighttime Tension
Nocturnal leg cramps and restless leg sensations have been associated with magnesium deficiency in some studies. These physical disturbances can fragment sleep, causing frequent awakenings and reduced sleep efficiency. If your legs feel jumpy or your calf muscles cramp at night, magnesium status is a reasonable factor to discuss with a healthcare professional.
Difficulty Falling Asleep vs. Staying Asleep: What the Research Suggests
Some research suggests that magnesium may help with sleep onset, while other evidence points toward improvements in sleep maintenance. A 2012 study in older adults found that magnesium supplementation was associated with longer sleep time and lower cortisol levels. However, the scientific evidence is mixed; some trials show modest benefit, while others show little effect. It is essential not to assume that magnesium is a universal cure for insomnia.
The Difference Between Occasional Poor Sleep and a Clinical Sleep Disorder
Occasional poor sleep after a stressful week may respond to nutritional adjustments. In contrast, chronic insomnia, sleep apnea, or severe daytime dysfunction requires professional evaluation. A mineral supplement should not replace a medical assessment if you suspect a real sleep disorder—rather, it may support general wellbeing alongside proper care.
Common Causes and Risk Factors for Low Magnesium Levels
Magnesium deficiency is often called "invisible" because blood tests may appear normal while tissue levels are insufficient. Many factors contribute to low magnesium status in modern life.
Dietary Shortfalls: The Modern Processed Food Problem
The standard Western diet is rich in refined grains, processed meats, and sugars—all of which provide little magnesium. Refining grains removes the germ and bran, where most minerals are concentrated. People who consume few whole foods may fall far below the recommended daily allowance without ever realizing it.
Lifestyle Factors: Alcohol, Caffeine, and High Stress
Alcohol increases magnesium excretion through the kidneys. High caffeine intake may also reduce magnesium retention or interfere with absorption. Stressful lifestyles further deplete magnesium because stress hormones increase urinary losses. Together, these habits create a cycle: stress alters sleep, poor sleep increases stress, and magnesium levels drop further.
Age-Related Changes in Magnesium Absorption
As we age, intestinal absorption of magnesium often declines. Older adults also tend to take more medications, which may interfere with mineral balance. Additionally, appetite changes can reduce consumption of magnesium-rich foods. These factors explain why magnesium insufficiency is more common among adults over 60.
Medications That May Deplete Magnesium (e.g., Diuretics, Proton Pump Inhibitors)
Certain medications are known to deplete magnesium. Loop and thiazide diuretics increase urinary magnesium loss. Proton pump inhibitors (PPIs) used for acid reflux can reduce magnesium absorption over time. If you take any of these medications, your doctor may periodically check your magnesium status.
Gastrointestinal Conditions and Their Impact on Absorption
Crohn's disease, celiac disease, and irritable bowel syndrome can impair mineral absorption due to inflammation or rapid intestinal transit. Even without a diagnosed condition, frequent diarrhea or chronic laxative use may lower magnesium levels. This is why a healthy gut is indispensable for absorbing magnesium from food and supplements alike.
Why Magnesium Needs Vary From Person to Person
There is no one-size-fits-all magnesium recommendation. Individual requirements depend on a combination of biological and lifestyle factors.
Age, Gender, and Life Stage (Including Pregnancy)
The recommended dietary allowance (RDA) for magnesium is around 310–320 mg for adult women and 400–420 mg for adult men. Pregnancy increases requirements to about 350–360 mg per day. During lactation, needs remain similarly elevated. Older adults may also require slightly more to offset reduced absorption.
Genetics and Individual Absorption Rates
Some individuals carry genetic variations that affect how well they absorb or retain magnesium. These variations are not routinely tested, but they may explain why two people eating similar diets can have very different magnesium status. This genetic variability reinforces the need for individualized approaches rather than blanket recommendations.
The Role of Existing Health Conditions and Nutrient Interactions
Diabetes, insulin resistance, and kidney disease can all affect magnesium handling. Additionally, interactions with calcium, zinc, and potassium can influence magnesium absorption. For instance, very high calcium intakes may compete with magnesium for absorption pathways, while adequate vitamin D status generally supports magnesium utilization. These interactions highlight the complexity of mineral balance.
Diet and Lifestyle Strategies to Improve Sleep Quality First
Before considering supplements, most people can benefit from optimizing their magnesium intake through food. Whole foods provide magnesium in a natural matrix of fiber, antioxidants, and other minerals that support absorption.
Magnesium-Rich Foods: Leafy Greens, Nuts, Seeds, and Legumes
Excellent sources of magnesium include spinach, Swiss chard, almonds, cashews, pumpkin seeds, black beans, and edamame. A serving of spinach (about one cup cooked) provides roughly 157 mg of magnesium. A handful of almonds (about 28 grams) delivers around 80 mg. Including a variety of these foods every day can meaningfully contribute to your total intake.
How Much Magnesium Do You Need From Food? (RDA Overview)
The RDA provides a useful benchmark for planning your diet. Adults generally need between 310 and 420 mg per day depending on age and sex. Eating magnesium-rich whole foods at each meal—such as oatmeal at breakfast, spinach in a lunch salad, and beans with dinner—makes it achievable to reach these targets without supplements.
Lifestyle Habits That Support Magnesium Retention and Better Sleep
Reducing alcohol consumption and moderating caffeine intake can help your kidneys retain magnesium. Regular physical activity supports healthy magnesium distribution in the body, although extreme endurance exercise increases losses through sweat. Managing stress through mindfulness or relaxation techniques can also reduce stress-induced magnesium wasting.
The Importance of Sleep Hygiene and Circadian Rhythm Alignment
No mineral can compensate for poor sleep habits. Going to bed at a consistent time, limiting screen exposure before sleep, and keeping your bedroom cool and dark form the foundation of good sleep. Magnesium works best as a component of a broader sleep-friendly lifestyle, not as a substitute for these habits.
The Role of Magnesium Supplements in Sleep Support
Supplements can play a legitimate role for people who cannot meet their magnesium needs through diet alone. However, they are not a first-line solution for everyone.
Why Supplementation Is Not the First Step, But a Valid Option
If your diet is already rich in whole foods, a supplement may add little benefit. Conversely, if dietary gaps, medication use, or absorption problems prevent you from getting enough magnesium from food, a targeted supplement may be a practical way to fill the gap. The key is to treat supplementation as a deliberate decision, not an automatic response to sleep complaints.
The Difference Between Nutritional Support and Treating a Deficiency
A diagnosed magnesium deficiency—confirmed by a healthcare provider through blood tests or clinical assessment—usually warrants supplementation. In contrast, using magnesium for "general sleep support" is a different scenario. In the latter case, effects may be subtle and depend greatly on your current magnesium status. Supplements cannot correct a nutrient deficiency if one does not exist.
How Magnesium Glycinate, Citrate, and Oxide Differ for Sleep
Three common forms of magnesium appear on supplement labels. Magnesium glycinate binds magnesium to the amino acid glycine, which itself has calming properties; this form is often used for sleep support. Magnesium citrate is well absorbed but may draw water into the intestines, sometimes causing a laxative effect. Magnesium oxide contains a high amount of elemental magnesium but is relatively poorly absorbed. For sleep, glycinate is often preferred, but individual tolerance matters.
When Supplementation May Be Relevant for Sleep Quality
There are situations where magnesium supplementation makes more sense than simply trying to change your diet.
Situations Where Diet Alone May Not Be Sufficient
If you follow a restricted diet (such as a low-calorie or low-carb diet), avoid major food groups, or have a digestive condition that impairs absorption, diet alone may not provide sufficient magnesium. Athletes who lose large amounts of magnesium through sweat may also fall short. These scenarios justify considering a supplement.
Signs That a Blood Test or Professional Assessment May Be Needed
Routine blood tests do not measure tissue magnesium levels accurately. However, a serum magnesium test can identify severe deficiency. If you have symptoms like chronic fatigue, persistent muscle cramps, and sleep disturbances, ask your doctor whether magnesium testing is appropriate. Remember that symptoms alone are not diagnostic.
General Support vs. Medical Guidance: Understanding the Boundary
It is perfectly reasonable to use magnesium as a general nutritional support for sleep if you are generally healthy. But if you have chronic disease, take prescription medications, or are pregnant, professional guidance is essential. A doctor or registered dietitian can help you determine the right form and dose for your situation.
How to Choose the Right Magnesium Supplement for Sleep
Choosing a magnesium supplement involves more than grabbing the cheapest bottle on the shelf. Understanding form, dose, and quality can make a meaningful difference in your experience.
Comparing Magnesium Forms: Glycinate, Citrate, Threonate, and Oxide
Magnesium glycinate is frequently recommended for sleep because of its calming amino acid component. Magnesium threonate is a newer form that may cross the blood-brain barrier more effectively, although research is still emerging. Citrate is a good general-purpose form but may cause loose stools. Oxide is inexpensive but poorly absorbed. For most people, glycinate strikes the best balance between absorption and tolerability for sleep purposes.
Dosage and Concentration: What to Look for in a Serving Size
Look for the amount of elemental magnesium, not just the total compound weight. A capsule of magnesium glycinate might weigh 500 mg but contain only 100 mg of elemental magnesium. The recommended supplemental dose typically ranges from 200 to 400 mg of elemental magnesium daily, divided into smaller doses if needed. Do not exceed the tolerable upper intake level of 350 mg from supplements per day without medical supervision.
Bioavailability: How Well Your Body Absorbs Different Forms
Bioavailability refers to the amount of a nutrient that is actually absorbed and used by the body. Magnesium is better absorbed from smaller doses taken with food than from large doses taken on an empty stomach. Among common forms, citrate and glycinate tend to have good bioavailability, while oxide is less efficient. If a product lists a cheaper form, you may need a higher dose to achieve the same effect.
Single-Ingredient vs. Combination Products (e.g., Magnesium with Melatonin or B6)
Some products combine magnesium with other sleep-supporting ingredients like melatonin, L-theanine, or vitamin B6. These combinations may be convenient, but they make it harder to adjust individual doses. If you already take melatonin or use other supplements, a single-ingredient magnesium product offers more flexibility and fewer potential interactions.
Purity, Third-Party Testing, and Quality Certifications
A reputable supplement brand should test its products for contaminants and verify label accuracy. Look for certifications from organizations like NSF International, USP, or Informed Choice. Third-party testing does not guarantee efficacy but does ensure the product contains what the label claims and is free from harmful levels of heavy metals or pesticides.
Capsules, Tablets, Powders, and Liquids: Which Format Is Right for You?
Capsules are convenient and easy to dose. Powders can be mixed into water and are useful if you prefer larger doses or have difficulty swallowing pills. Tablets are economical but may contain more binders and fillers. Liquids are absorbed quickly but typically have a shorter shelf life. Choose the format that fits your routine and digestion.
Allergens, Additives, and Dietary Preferences (Vegan, Gluten-Free, Non-GMO)
Many supplement capsules contain gelatin, which is not suitable for vegetarians or vegans. Look for plant-based capsules made from cellulose or pullulan. Check the allergen statement for gluten, soy, or dairy. If you prefer non-GMO ingredients, verify the certification on the label. These considerations matter for daily compliance and personal health values.
What to Look for on a Magnesium Supplement Label
Reading a supplement label is a skill that takes practice. Here are the essentials for magnesium products.
Understanding Elemental Magnesium vs. Magnesium Compound Weight
The label should clearly state the amount of elemental magnesium per serving. For example, "Magnesium (as magnesium glycinate) 200 mg" means 200 mg of elemental magnesium is present. If the label only says "magnesium glycinate 500 mg," the elemental amount is lower—typically around 50–100 mg. Understanding this distinction prevents underdosing.
Serving Size and Daily Value (DV) Percentages
The Daily Value for magnesium is 420 mg for adults. A supplement providing 100 mg of elemental magnesium would show about 24% DV. Some products suggest two or three capsules per serving to reach an effective dose. Always read the serving size before comparing products—a higher price per bottle may not mean higher value if you must consume more capsules.
Identifying Quality Indicators: "USP Verified," "NSF Certified," and "Third-Party Tested"
USP Verified and NSF Certified are rigorous, independent testing programs that verify purity and potency. "Third-party tested" is a broader term that varies in meaning; it may not guarantee the same level of rigor. When possible, choose products with verified certifications. These indicators reduce the risk of buying a mislabeled or contaminated product.
Red Flags: Proprietary Blends, Artificial Fillers, and Unclear Dosing
Be cautious of proprietary blends that hide individual ingredient amounts. Artificial colors, hydrogenated oils, and titanium dioxide are unnecessary additives. If a label does not clearly state elemental magnesium, consider it a red flag. Legitimate brands provide transparent, complete ingredient information.
Who May Benefit Most From a Magnesium Supplement for Sleep?
Certain groups are more likely to benefit from magnesium supplementation than others.
Adults Over 50 and Older Adults
Age-related declines in absorption, combined with medication use and dietary changes, make older adults a primary candidate for magnesium supplementation. If sleep quality declines with age, assessing magnesium status is a practical step.
Individuals with High-Stress Lifestyles or Shift Work
Shift workers who struggle to maintain a consistent sleep-wake cycle may find magnesium helpful because it supports the nervous system's ability to calm down. High-stress professionals who rely on caffeine and alcohol may also benefit from replenishment.
Athletes and Highly Active Individuals
Sweat loss and muscle breakdown during exercise increase magnesium requirements. Athletes who train intensely may need additional magnesium to support recovery and sleep quality, particularly during periods of heavy training volume.
People with Restricted Diets (e.g., Vegetarian, Vegan, or Low-Calorie Diets)
Vegan and vegetarian diets can provide magnesium from legumes and seeds, but low-calorie diets may make it difficult to reach the RDA. Individuals on medically supervised weight-loss programs should discuss supplementation with their provider rather than self-prescribing.
When to Consult a Healthcare Provider Before Starting
Consult a doctor before starting magnesium if you have kidney disease, heart disease, low blood pressure, or myasthenia gravis. Pregnant or breastfeeding women should also seek professional advice. If you take any prescription medication, ask about potential interactions before adding a supplement.
Safety, Side Effects, and Interactions of Magnesium Supplements
Magnesium is generally safe when taken at recommended doses, but it is not entirely without risk.
Common Side Effects: Digestive Upset and Loose Stools
The most common side effect is loose stools or diarrhea, particularly with magnesium citrate or oxide. Magnesium glycinate tends to be gentler on the stomach. If you experience digestive discomfort, reduce the dose or switch to a different form.
Upper Intake Limits and the Risk of Taking Too Much
The tolerable upper intake level for supplemental magnesium is 350 mg per day for adults. This limit applies only to supplements, not food. Exceeding this amount may cause nausea, cramping, and diarrhea. Severe excessive intake—usually from supplements—can lead to irregular heartbeat or cardiac arrest, though this is rare.
Interactions with Medications (Antibiotics, Blood Pressure Drugs, Thyroid Medication)
Magnesium can interfere with the absorption of certain antibiotics, including ciprofloxacin and tetracyclines. It may also potentiate the effects of blood pressure medications, leading to low blood pressure. Thyroid medications like levothyroxine should be taken separately from magnesium. Space magnesium supplements at least two hours away from other medications.
Special Considerations for Kidney Disease and Pregnancy
Individuals with chronic kidney disease cannot excrete excess magnesium efficiently, increasing the risk of magnesium toxicity. Pregnant women should stick to recommended doses—more is not better—because very high doses could have adverse effects. Always inform your obstetrician about any supplements you take during pregnancy.
Decision Support: Is a Magnesium Supplement Right for Your Sleep?
Use this step-by-step framework to decide whether magnesium supplementation is worth trying.
Step 1: Evaluate Your Diet and Lifestyle First
Keep a food diary for three days and estimate your daily magnesium intake. Are you consistently below 300 mg from food? Do you drink alcohol regularly or take magnesium-depleting medications? If yes, improving your diet and reducing alcohol may be enough.
Step 2: Consider Your Specific Sleep Symptoms and Patterns
Are you lying awake with tense muscles or racing thoughts? If so, magnesium may support relaxation. Do you wake up multiple times with leg cramps? Magnesium may help. If you sleep deeply but wake only in the early morning hours feeling anxious, the cause may be more hormonal or psychological than nutritional.
Step 3: Choose a Product Based on Form, Dosage, and Quality
If diet changes prove insufficient, choose a product with 200–300 mg of elemental magnesium in a well-absorbed form like glycinate or threonate. Verify third-party testing and check the label for clear elemental dosing. Start with the smaller dose and observe the effect.
Step 4: Monitor Your Response and Adjust Accordingly
Allow two to four weeks of consistent use before judging the effect. Keep a sleep journal noting sleep onset, night awakenings, and dream quality. If you see no improvement, revisit your sleep hygiene and consider whether other factors—such as anxiety, screen time, or caffeine—are the real culprits. If you experience side effects, lower the dose or try a different form.
Conclusion: Making an Informed Choice About Magnesium and Sleep Quality
Magnesium is a fascinating mineral with a clear biological relationship to relaxation and sleep. However, it is not a magic bullet. The best approach is to build a nutrient-dense diet, maintain consistent sleep habits, and use supplements deliberately when dietary intake is insufficient. Pay attention to your unique body, consult professionals when needed, and let evidence—not marketing—guide your choices.
The Main Takeaway: Food First, Supplement Smart
Start with greens, nuts, seeds, legumes, and whole grains. These foods provide magnesium along with fiber and other nutrients that supplements cannot replicate. Use supplements to fill gaps, not to replace a poor diet.
Final Thoughts on Using Magnesium as Part of a Broader Sleep Strategy
Good sleep emerges from a combination of smart daytime habits, a comfortable environment, a consistent schedule, and—when necessary—targeted nutritional support. Magnesium may be one piece of that puzzle. Pay attention to your body, measure your progress, and make changes thoughtfully. For further reading on mineral health, explore our magnesium collection or our comprehensive mineral supplements guide.
Key Takeaways
- Magnesium contributes to sleep by supporting GABA activity, melatonin production, and muscle relaxation.
- Modern diets often provide less magnesium than recommended due to processed food consumption.
- Common signs of low magnesium may include nighttime leg cramps, muscle tension, and difficulty relaxing before bed.
- Adults need roughly 310–420 mg of magnesium per day, depending on age and sex.
- Dietary sources like leafy greens, nuts, and legumes should be the primary strategy for improving magnesium intake.
- Alcohol, high caffeine intake, and stress increase magnesium losses through urine.
- Older adults, athletes, and people taking certain medications may have higher magnesium needs.
- Magnesium glycinate is often the best choice for sleep support, while citrate is better for those needing a laxative effect.
- Supplemental magnesium should not exceed 350 mg per day from supplements without medical supervision.
- Supplements may interfere with antibiotics, blood pressure drugs, and thyroid medication—space them properly.
Frequently Asked Questions
Can magnesium help you fall asleep faster?
Some research suggests that magnesium may reduce the time it takes to fall asleep, particularly in people with low magnesium status. Its calming effect on the nervous system and GABA activity contributes to this outcome. However, results vary between individuals, and magnesium is not a sedative.
What is the best form of magnesium for sleep?
Magnesium glycinate is widely considered the most suitable form for sleep because it combines magnesium with glycine, an amino acid with calming neurotransmitter properties. Magnesium threonate is another option that may cross the blood-brain barrier more effectively. Citrate is also absorbed well but may cause digestive discomfort.
How long does it take for magnesium to improve sleep?
Some people notice benefits within a few days, while others require two to four weeks of consistent use. The timeline depends on your baseline magnesium status, absorption, and the dose you take. Consistency is more important than taking a high dose.
What are the symptoms of low magnesium at night?
Nighttime symptoms of low magnesium include leg cramps, restless legs, twitching muscles, and a feeling of tension that makes it hard to relax. Some people also report heightened anxiety or racing thoughts at bedtime. These symptoms alone do not confirm a deficiency—laboratory testing may be needed.
Should I take magnesium every night?
Magnesium does not need to be cycled in the way some supplements are cycled. If you are using it to address a dietary gap, daily supplementation is generally acceptable. Taking it consistently every evening may help support steady magnesium status.
Can you take magnesium with melatonin?
Yes, magnesium and melatonin are often combined in sleep supplements. Taking them together is generally considered safe for short-term use. However, if you are new to either supplement, start with one at a time to understand its effects.
What is the best time of day to take magnesium for sleep?
Taking magnesium in the evening, about one to two hours before bedtime, is most common for sleep purposes. Pairing it with a light snack can improve absorption and reduce digestive side effects. Morning or midday dosing is fine if evening dosing causes drowsiness during the day.
Can magnesium cause insomnia?
While magnesium typically promotes relaxation, a very high dose may cause digestive discomfort or a paradoxical reaction in some individuals. If you take magnesium and feel worse, reduce the dose or discontinue use. Insomnia may also stem from other undiagnosed factors.
Does magnesium help with restless legs syndrome?
Some preliminary research suggests magnesium may help relieve restless legs syndrome, particularly in cases linked to magnesium deficiency. A 2019 study found reduced symptoms with magnesium supplementation. However, more substantial clinical trials are needed, and restless legs can be caused by iron deficiency or other conditions.
Is it safe to take 500 mg of magnesium before bed?
Taking 500 mg of elemental magnesium from supplements exceeds the tolerable upper intake level of 350 mg per day. Very high doses may cause diarrhea, nausea, or low blood pressure. Start with 200–300 mg and consult a healthcare provider if you think you need more.
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