Why Magnesium Deserves More Attention
If you spent any time on the web digging into wellness, you’ve probably seen magnesium popping up when it comes to getting a good night’s sleep. Someone swearing their nighttime supplement will work wonders, or a reel about which magnesium is best for what. The conversations are real, but they only share a small piece of the puzzle.
I’m going to bet you didn’t know that magnesium is involved in over 300 processes in the body (1, 2). Your muscles, your energy levels, your nervous system, and even your heart all depend on it. It’s one of the most important minerals your body needs, and most people don't get enough of it (3). For something the body relies on this heavily, it’s worth paying attention to.
When your magnesium intake isn’t where it needs to be, you feel it, and over time, that shortfall can affect your health in ways that go beyond a bad night of sleep (7). But you are already one step ahead of the game by reading this blog. Getting your magnesium on track is more manageable than you might think. A few changes to what you eat, combined with the right supplement (if you need one), can make a meaningful difference for your body. This post breaks it all down for you so you know exactly where to start.
What Does Magnesium Actually Do?
Magnesium is a cofactor, meaning it helps enzymes in the body do their jobs (1). Enzymes are proteins that act like tiny machines inside your body, speeding up chemical reactions that keep you alive and functioning. Digesting food, producing energy, repairing cells, and hundreds of other processes all rely on enzymes working properly. And many of those enzymes need magnesium to get the job done. As you can imagine, there are a lot of jobs that need to be taken care of. Over 300 biochemical reactions depend on magnesium, touching nearly every system in the body (1, 2).
Magnesium plays a role in:
Energy production: Magnesium helps your body turn the food you eat into energy (1, 2).
Muscle function: It helps your muscles contract and relax properly. If you have ever dealt with cramps or muscle tension, low magnesium is often part of that conversation (1).
Nervous system: Magnesium helps your brain and body communicate by supporting the chemical messengers that carry signals back and forth (1, 2).
Blood sugar balance: It helps your body process sugar and respond to insulin the way it should (2).
Bone health: About 60% of the magnesium in your body is stored in your bones, where it helps keep them strong and dense (1).
Heart rhythm: Magnesium helps your heart muscle function normally and keeps your heartbeat steady (1, 2).
Understanding Magnesium Deficiency: Are You Getting Enough?
Most people assume that if something were off with their nutrition, they would know about it. But a magnesium deficiency, which simply means your body is not getting or holding onto enough magnesium to function the way it should, does not always show up in obvious ways. That is a big part of why it flies under the radar for so many people.
The daily amount of magnesium that most healthy people need to function at their best is 400–420 mg per day for men and 310–320 mg per day for women. Yet a recent study looked at magnesium levels in children and adults across the United States and found that a large portion of the population is not hitting those daily targets (3). Here are a few of the reasons why:
The magnesium content in soil has declined over time due to modern farming, so the food grown in that soil has less magnesium than it used to.
Processed and packaged foods, which many people eat every day, are usually low in magnesium.
And some medications and health conditions can make it harder for the body to absorb and retain magnesium, as well as other vitamins and minerals (1, 2).
What Does Low Magnesium Feel Like?
The tricky part is that the signs of low magnesium look a lot like everyday complaints. Take low energy, for example. It is normal to feel worn down by the end of a busy week, but low energy can also mean your magnesium levels are low. So, in many cases, magnesium rarely makes the list of suspects, even when it should. Some of the most common signs include:
Muscle cramps or twitches
Trouble falling or staying asleep
Feeling worn down or low on energy
Headaches or migraines
Mood shifts, like feeling anxious or irritable
Constipation or an upset stomach
An irregular heartbeat
If any of those sound familiar, it may be worth taking a closer look at how much magnesium you are getting from food or supplements, especially if you are already taking them. A quick conversation with your healthcare provider can help you figure out if your levels need some attention.
The Best Food Sources of Magnesium
There are plenty of everyday foods that are naturally rich in magnesium, and for many people, the best place to start is on their plate. Before reaching for a supplement, it is worth looking at what you are already eating and where there might be room to add a little more (1, 2).
Here are some of the best food sources of magnesium:
Leafy greens: Spinach and Swiss chard are among the highest magnesium-containing vegetables you can eat. A single cup of cooked spinach delivers a significant portion of your daily needs (1).
Nuts and seeds: Pumpkin seeds are one of the most concentrated sources of magnesium you can find. Almonds, cashews, and chia seeds are also great options (1, 2).
Legumes: Black beans, edamame, and lentils are affordable, versatile, and deliver a solid amount of magnesium per serving (2).
Whole grains: Brown rice, quinoa, and whole wheat bread all contribute to your daily magnesium intake (1, 2).
Dark chocolate: Good news for chocolate lovers. Dark chocolate, particularly varieties that are 70% cacao or higher, is a surprisingly good source of magnesium (2).
Avocado: A great source of healthy fats and a good source of magnesium, making it an easy addition to many meals (1).
Bananas: Often associated with potassium, bananas also deliver a helpful amount of magnesium (2).
Fatty fish: Salmon and mackerel contain magnesium alongside other nutrients that are good for overall health (1).
Simple Ways to Get More Magnesium From Food
You do not need to overhaul your entire diet to boost your magnesium intake. A few small swaps can add up quickly:
Add a handful of pumpkin seeds, hemp seeds or almonds to your meals or snacks
Toss baby kale into smoothies, soups, or eggs in the morning
Choose whole-grain bread and brown rice over white bread or rice
Add black beans or lentils to meals a few times a week
When it comes to magnesium, it's the small, steady habits that add up and make a real impact over time (1, 2).
Magnesium and Your Heart
When most people think about keeping their heart strong, they think about cholesterol levels, sodium intake, and/or exercise. Magnesium doesn’t typically come up in that conversation, but research suggests it probably should.
A study called the Atherosclerosis Risk in Communities study, which followed thousands of adults over many years, found that people who ate diets higher in magnesium had a lower risk of developing cardiovascular disease (7). To put it simply, the more magnesium-rich foods people ate consistently, the better their heart health outcomes were.
That said, it is important to keep in mind that people who eat more magnesium-rich foods also typically follow healthier diets overall. They are likely eating more vegetables, whole grains, and nuts, moving their bodies regularly, and making other choices that all add up. So it is hard to say that magnesium alone deserves all the credit. But what the research does tell us is that magnesium appears to be an important piece of the bigger puzzle (7).
So how does magnesium support the heart?
It helps regulate blood pressure. Magnesium helps relax the walls of blood vessels, which can help maintain healthy blood pressure levels (1, 2).
It helps maintain a steady heart rhythm. It helps the heart muscle contract and relax properly, which is important for maintaining a regular heartbeat (1, 2).
It works alongside other minerals. Magnesium, calcium, and potassium work together to keep the heart functioning the way it should. When magnesium is low, that balance can be thrown off (1).
The takeaway here is not that magnesium is a fix for heart disease. It is that eating a diet rich in magnesium, as part of an overall healthy lifestyle, appears to work in favor of your heart’s health. And that sounds like a pretty good reason to make sure you are getting enough (7).
Choosing the Right Magnesium Supplement
If you’re not hitting your magnesium needs through food alone, a supplement can be a practical and effective way to fill the gap. But walking down the supplement aisle can feel overwhelming. There are so many options, how do you know which one is right for you? The form of magnesium you choose matters, and matching it to your specific goal/interest makes a real difference (4, 5).
Here is a breakdown of the most common forms:
Magnesium glycinate is magnesium paired with glycine, an amino acid that has natural calming properties. It is one of the most well-absorbed forms and is gentle on the stomach, making it a great everyday option. It is often recommended for relaxation and sleep (4).
Magnesium citrate is magnesium paired with citric acid. It is widely available, affordable, and well absorbed by the body. It is commonly used for digestive regularity and, in higher doses, can have a laxative effect. This is something to keep in mind when choosing your dose (5).
Magnesium L-threonate is a newer form that has been specifically studied for its ability to cross the blood-brain barrier. Research suggests it may improve sleep quality and cognitive function, making it a popular choice for people interested in brain health and memory (6).
Magnesium oxide is one of the most common forms you will find on store shelves, but it is worth knowing that it is one of the least absorbed forms available. Much of it passes through the body unused, so while it is inexpensive and easy to find, it is generally not the best choice if your goal is to raise your magnesium levels (1).
Magnesium malate is magnesium paired with malic acid, a compound found naturally in fruit. It is thought to aid energy production and muscle function and is generally well-tolerated (1).
Magnesium taurate is magnesium paired with taurine, an amino acid that supports heart and nervous system function. It is sometimes chosen by people specifically focused on cardiovascular health(1).
How to Choose the Right One for You
A simple way to think about it:
For relaxation and sleep: magnesium glycinate or magnesium L-threonate
For constipation relief: magnesium citrate
For brain health and cognitive function: magnesium L-threonate
For muscle function and energy: magnesium malate
For heart health: magnesium taurate or magnesium glycinate
It is always a good idea to check in with your healthcare provider before starting a new supplement, especially if you are taking medications or managing a health condition. They can help you determine the right form and dose for your individual needs.
Magnesium and Sleep
This may have been the section that brought you here in the first place. If that is the case, I am glad you stayed for everything that came before it. Magnesium and sleep are a hot topic right now, but there is more to the story than most social media posts let on. Let’s dive in.
When it comes to magnesium and sleep, two forms tend to come up most often: magnesium glycinate and magnesium L-threonate.
Magnesium glycinate is the one you will see recommended most often for sleep. It’s magnesium paired with glycine, an amino acid with its own natural calming effect on the body. Together, they are thought to help the body relax and wind down at night. Most people also find it easy on the stomach, which makes it a popular first choice (4).
Magnesium L-threonate has some research behind it. A study that tested this specific form on adults who reported having trouble sleeping found that it helped to improve sleep quality. People also reported feeling and functioning better during the day. This form is thought to work well because it crosses the blood-brain barrier more readily than other forms, which may be why it shows promise for both sleep and brain function (6).
So what does this mean for you?
If your main goal is relaxation and better sleep, magnesium glycinate is a great place to start. It is easy to find, affordable, and gentle on the body (4).
If you are dealing with ongoing sleep issues, magnesium L-threonate may be worth a conversation with your healthcare provider (6).
Magnesium is not a sleeping pill. It isn’t going to fix a sleep problem rooted in stress, inconsistent schedules, or too much screen time. It may help your body wind down, but it works best when paired with a consistent, relaxing nighttime routine.
FAQs: Your Magnesium Questions Answered
Can you get enough magnesium from food alone?
For some people, yes. If you are regularly eating a variety of magnesium-rich foods like leafy greens, nuts, seeds, legumes, and whole grains, you may be meeting your daily needs through diet alone (1, 2). But, many people are not eating enough of these foods every day, and factors like soil depletion, food processing, and certain medications can make it harder to get enough from food alone (3). If you are unsure where you stand, a conversation with a nutrition professional can send you in the right direction.
Is it possible to take too much magnesium?
From food sources, it’s very unlikely. The body is good at regulating how much magnesium it absorbs from food and will typically excrete any excess (1). Supplements are a different story. Taking very high doses of magnesium from supplements can cause side effects like diarrhea, nausea, and stomach cramps. In very rare cases, extremely high doses can lead to more serious issues (1, 2). Sticking to the recommended dose on the label and checking in with your healthcare provider before starting is always the safest approach.
What is the best time of day to take magnesium?
It depends on the form and your goal. If you are taking magnesium for relaxation or sleep, taking it about an hour before bed generally works well. If you were to take it in the morning, you might feel sleepy during the day. If you are taking it for general health or digestive regularity, taking it with a meal can help reduce the chance of any stomach discomfort (4, 5). When it comes to nutrition and supplements, there is no single right answer. A lot of it comes down to what fits best into your daily routine.
Do I need to take magnesium every day?
Consistency is key with magnesium. Because the body uses it continuously across so many processes, keeping your levels steady through daily intake, whether from food, supplements, or both, is generally more effective than taking it sporadically (1, 2). Think of it less as a supplement you take when you need it and more as a daily habit that works in your body's favor over time.
A Summary: Building a Magnesium-Rich Routine
Getting your magnesium on track does not require a complete overhaul of your diet or a cabinet full of supplements. Like most things, it comes down to small habits that add up and make a real impact over time.
Here are a few simple ways to start building magnesium into your daily routine:
Start with food first. Look at what you are already eating and find easy places to add more magnesium-rich options. A handful of hemp or pumpkin seeds here, some baby kale or beans tossed into dinner there. Small additions make a real difference over time (1, 2).
Be consistent. Magnesium works best when your levels stay steady. Whether you are getting it from food, a supplement, or both, showing up for it daily is what counts (1).
Choose the right supplement for your goal. If you decide to add a supplement, go back to the breakdown in the supplement section and match the form to what your body needs (4, 5, 6).
Check in with your healthcare provider. If you have been experiencing symptoms that sound familiar from the deficiency section, or if you are managing a health condition, talk to a professional about your magnesium levels before making any changes or starting any supplements (1, 3).
You Have Everything You Need to Get Started
Magnesium has been keeping your muscles, heart, sleep, and hundreds of other processes in check without asking for much in return. All it needs is a little more of your attention.
There is no perfect plan. The best approach is the one that fits your life, your food preferences, and your goals.
Magnesium might be where this conversation started, but it does not have to be where it ends. If you are ready to take a closer look at your nutrition and figure out what your body has been missing, a 1:1 nutritional consultation is the perfect next step. We will talk about your goals, your habits, and how to build a plan that actually works for you. And if Dr. Google has been sending you down rabbit holes and leaving you more confused than when you started searching nutrition topics, bring those questions, and let’s get things straight. Myself or nutritionist Caitlin are glad to help.
Check out our nutritional counseling services here.
In health,
Keri Connell, CNS, LDN, IFNCP
Licensed Nutritionist & Cooking Instructor at the Crossroads Teaching Kitchen
Reference
1. National Institutes of Health. Magnesium. National Institutes of Health. Published 2022. https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/
2. Harvard T.H. Chan. Magnesium. The Nutrition Source. Published October 21, 2019. https://nutritionsource.hsph.harvard.edu/magnesium/
3. Jiao K, Costello R, Gahche J, Rosanoff A, Wallace TC. Serum magnesium levels in the United States—an updated population reference interval in children and adults. The Journal of Nutrition. Published online April 2026:101539. doi:https://doi.org/10.1016/j.tjnut.2026.101539
4. Mayo Clinic. Magnesium glycinate: Is this supplement helpful for you? Mayo Clinic Press. Published February 7, 2024. https://mcpress.mayoclinic.org/nutrition-fitness/magnesium-glycinate-is-this-supplement-helpful-for-you/
5. MedlinePlus. Magnesium Citrate: MedlinePlus Drug Information. medlineplus.gov. Published April 15, 2019. https://medlineplus.gov/druginfo/meds/a619019.html
6. Hausenblas HA, Lynch T, Hooper S, Shrestha A, Rosendale D, Gu J. Magnesium-L-threonate improves sleep quality and daytime functioning in adults with self-reported sleep problems: A randomized controlled trial. Sleep Medicine X. 2024;8(100121):100121-100121. doi:https://doi.org/10.1016/j.sleepx.2024.100121
7. Copp KL, Steffen LM, Yi SY, Lutsey PL, Rebholz CM, Rooney MR. Magnesium-rich diet score is inversely associated with incident cardiovascular disease: the Atherosclerosis Risk in Communities (ARIC) study. European journal of preventive cardiology. 2025;32(5):386-393. doi:https://doi.org/10.1093/eurjpc/zwae251