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A Guide to Magnesium Supplements: Types, Benefits, and How to Choose the Right One

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Updated on August 3, 2026
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Magnesium is a mineral involved in hundreds of biochemical reactions in your body. Adults need between 310 and 420 milligrams (mg) of magnesium a day, depending on age and lifestyle. But research suggests that many people don’t get enough.

“Magnesium is a mineral your body quietly depends on all day long,” says Diane Lindsay-Adler, RDN, an assistant professor of pediatrics at New York Medical College. “It helps muscles relax after they contract, nerves send signals properly, the heart maintain a steady rhythm, and the brain regulate mood and sleep.”

If diet alone isn’t enough to meet your needs, taking a supplement can help fill the gap. But choosing one isn’t always straightforward, as magnesium doesn’t come in just one form. “The difference between magnesium supplements is in what compound the magnesium is chemically attached to, which impacts how it gets absorbed and used by your body,” says Max Snider, RD, who is based in Sudbury, Ontario.

As a registered dietitian, I’ve seen firsthand how confusing the supplement aisle can feel. Labels highlight benefits but rarely explain how magnesium forms differ or how to make an informed decision. Some forms are better known for aiding digestion, while others are chosen for their ability to promote sleep or relaxation. This guide is designed to help you understand the different types of magnesium, what they do in your body, and why you might choose one over another.

To build this list, my dietitian colleagues and I reviewed ingredient quality, dosing transparency, third-party testing, and overall brand reputation. Here, we also explain when certain magnesium forms may be useful and what safety considerations to keep in mind.

When to Consult Your Doctor

Magnesium supplements are generally considered safe, but they aren’t appropriate for everyone. While dietary supplements are regulated by the U.S. Food and Drug Administration (FDA), they aren’t approved for safety, effectiveness, or labeling accuracy before being sold. Because quality can vary, choosing brands that undergo third-party testing for purity and potency is important.

If you’re unsure whether you need a supplement, or if you have underlying health conditions or you take medications, talk with your doctor or a registered dietitian. They can help you make a safe choice.

Magnesium Citrate

Not all magnesium supplements behave the same way in your body. Magnesium must be bound to something else to be absorbed. “That binding partner influences how the magnesium is absorbed, where it is distributed, and what effects it’s most associated with,” says Jenna Stangland, RD, who specializes in sports dietetics in Minneapolis.

Magnesium citrate is bound to citric acid and is one of the more bioavailable forms, meaning your body can use and absorb it.

 It’s often used to increase levels if someone is deficient, or for its digestive benefits. It works by drawing water into your intestines, which can improve stool frequency and consistency, making it best for constipation and sluggish movement of food through your gut, says Jessica Corwin, MPH, RDN, owner of Eat Grow Live in Grand Rapids, Michigan.

Taking magnesium citrate can sometimes cause loose stools or digestive discomfort because it’s so effective. “This kind of magnesium has a laxative effect, so it’s not always the best option for sensitive stomachs,” says Snider. For those who tolerate it well, however, it can be an affordable, accessible option.

magnesium

Now Foods Magnesium Citrate Powder

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We like the simple formulation of Now Foods Magnesium Citrate, with 450 mg of magnesium citrate in 1 teaspoon (tsp). Using powdered options can be especially helpful for people who dislike swallowing pills or want more control over the amount they take.

This product stands out for its minimal ingredient list: only magnesium citrate, with no unnecessary fillers or additives. It’s also third-party tested, which means it’s been independently tested for purity and contaminants.

magnesium

Solgar Magnesium Citrate Tablets

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Lindsay-Adler likes Solgar Magnesium Citrate Tablets, an affordable option for those who prefer an easy-to-take capsule. This product contains 400 mg in two tablets, with no fillers or artificial ingredients.

Solgar has a long-standing reputation for quality, and the brand uses extensive in-house quality control testing. According to the company, it analyzes all raw and finished materials using purity and quality standards set in guidelines from the United States Pharmacopeia (USP), an independent, nonprofit scientific organization.

magnesium

Trace Minerals Magnesium Liquid

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Trace Minerals Magnesium Liquid is a good option for people who prefer a liquid magnesium supplement over pills or powders. With 300 mg of magnesium (mainly as citrate) per serving, you can easily mix this into water or juice.

This liquid stands out for its straightforward ingredient list and third-party testing. Some people also prefer giving liquid to kids who need supplementation, since it can be easier to take.

Magnesium Glycinate

Magnesium glycinate (sometimes labeled as magnesium bisglycinate) is composed of magnesium bound to glycine, an amino acid that plays a role in nervous system regulation.

 “Magnesium glycinate is digested very well and does not have a laxative effect,” says Snider. “It’s very easy on the stomach, which is why it’s commonly recommended for sleep and for correcting magnesium deficiency.”

This combination of being easy to absorb and tolerable makes glycinate a frequent go-to among dietitians. “I use this one myself and recommend it for sleep, muscle relaxation, and anxiety,” says Corwin.

 “This form would be great for periods of high stress, travel, and back-to-back competitions where recovery is top priority,“ adds Stangland.
magnesium

JSHealth Magnesium+ Powder

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JSHealth won us over with its tasty raspberry lemonade flavor. Everyday Health writer SaVanna Shoemaker, RDN, tested an entire container. She found it tastes great mixed in plain water or other beverages, like orange juice and sparkling water.

Each two-scoop serving contains 400 mg of magnesium from a combination of magnesium citrate, magnesium amino acid chelate, and magnesium glycinate dihydrate. The inclusion of three different forms of magnesium also makes this product an excellent all-around magnesium supplement for people who aren’t necessarily looking for a specific benefit. JSHealth’s products are also third-party tested, and this magnesium supplement is vegan and non-GMO.

magnesium

Nature Made Magnesium Glycinate

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Nature Made Magnesium Glycinate is a budget-friendly option that provides 200 mg per two-capsule serving. If you want a straightforward option without a higher price tag, this pick fits the bill.

This product is USP verified, meaning the group has tested it to confirm that it contains the ingredients listed on the label and meets quality standards for purity and potency. It’s also easy to find at many retailers.

Thorne magnesium bisglycinate

Thorne Magnesium Bisglycinate

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Thorne Magnesium Bisglycinate is a powder I personally use and enjoy, because it mixes easily and tastes good. Each scoop provides 200 mg of magnesium. Plus, Thorne is known for its high-quality, rigorously tested supplements, which gives me extra confidence in the product.

I love to make a drink with the powder as a pre-bedtime ritual. “Magnesium interacts with GABA [gamma-aminobutyric acid] receptors to calm nervous system activity and inhibits NMDA receptors to promote muscle relaxation,” says Jennifer Pallian, RD, who is based in Vancouver, British Columbia. “It also supports melatonin production and can lower cortisol levels, creating conditions that favor a more stable sleep–wake cycle.”

magnesium

Klean Athlete Magnesium Glycinate

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We like this magnesium glycinate capsule for people who want an athlete-friendly option that’s easy to add to a daily routine. Each capsule provides 120 mg of magnesium glycinate. Plus, the product is NSF (National Science Foundation) Certified for Sport, which means it’s been third-party tested to verify that the contents match the label and that it’s free of substances banned in athletic competition. This formula is also non-GMO and vegan.

Because magnesium plays a role in muscle function, relaxation, and recovery, taking this glycinate option can be helpful for anyone who is active and needs a little more support.

magnesium

Pure Encapsulations Magnesium Glycinate

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Pure Encapsulations Magnesium Glycinate is a top choice if you’re looking for a quality, vegan-friendly supplement. Each capsule contains 120 mg of magnesium in a form that’s generally well-tolerated and is linked with relaxation and overall magnesium repletion.

Pure Encapsulations is a brand that nearly all our experts recommended or said they use themselves. All raw materials and finished supplements are third-party tested for heavy metals and contaminants. The vegan capsules and simple formula make it a good fit for people who prioritize transparent ingredients.

Magnesium L-Threonate

Magnesium L-threonate is often used to support brain health. It consists of magnesium bound to L-threonic acid, a compound derived from vitamin C.

 “Magnesium L-threonate was engineered to cross the blood-brain barrier more efficiently,” says Avery Zenker, RD, who is based in Canada. This means it may reach your brain more readily, where it could support processes involved in memory and focus.

Research in this area is still growing. “Magnesium L-threonate has emerging evidence suggesting it may cross the blood-brain barrier more effectively than other forms,” says Corwin. A few small studies have shown improvements in cognitive measures, especially for older adults. Data remain limited, though, Corwin says. Snider adds that magnesium L-threonate is “often used to support brain health and sometimes sleep.”

magnesium

Recess Mood Powder

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Recess Mood Powder delivers its magnesium in convenient, portable stick packs and pairs it with other calming ingredients, like L-theanine and passionflower. L-theanine is an amino acid linked with relaxation and stress reduction. Passionflower is an herb used to support calmness and sleep.

Each stick pack provides around 210 mg of magnesium from 1,561 mg of Recess’s proprietary magnesium blend. (The blend contains magnesium L-threonate, magnesium glycinate, and magnesium citrate.) So you get a combination of multiple types of magnesium. Recess products are also vegan and third-party tested.

magnesium

Life Extension Neuro-Mag Magnesium L-Threonate

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Life Extension Neuro-Mag is our pick for a brain-focused magnesium L-threonate supplement. It contains Magtein, a patented form of magnesium L-threonate that has been evaluated in research for its potential cognitive benefits.

 The formula is also non-GMO, gluten-free, vegetarian, and third-party tested for safety, purity, and quality.
A three-capsule serving provides 144 mg of elemental magnesium from 2,000 mg of magnesium L-threonate. Elemental magnesium refers to the total amount of usable magnesium in the product.

 This form delivers less elemental magnesium than options like citrate or glycinate, so it’s typically chosen for targeted neurological support rather than for correcting a deficiency.

 Life Extension also offers a gummy version for those who prefer an alternative to capsules.
magnesium

Sports Research Magnesium L-Threonate

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Sports Research Magnesium L-Threonate is another Magtein-based supplement formulated for cognitive support. Each serving provides 2,000 mg of Magtein, delivering 144 mg of elemental magnesium.

Sports Research products are third-party tested. According to the brand, its supplements are made in facilities certified by cGMP (Current Good Manufacturing Practice) regulations enforced by the FDA. That helps support quality, purity, and consistency.

Other Types of Magnesium

You may come across several other magnesium forms, though they aren’t used or recommended as often.

Magnesium oxide, for example, is one of the most affordable and widely available options. But many experts don’t recommend it for general supplementation. “Magnesium oxide has low bioavailability, meaning only a small amount is actually absorbed,” says Zenker. Because it’s poorly absorbed, it draws water into your intestines, which can make it more useful for constipation (although most dietitians prefer using magnesium citrate).

 Corwin adds that despite its high elemental magnesium content, oxide is much more likely to cause digestive side effects.
Magnesium malate and magnesium taurate are sometimes chosen for more-targeted health goals. Malate is bound to malic acid, a compound involved in cellular energy production. “Magnesium malate is connected to cellular energy production and muscle function, although evidence remains limited,” says Pallian.

 Magnesium taurate pairs magnesium with taurine, an amino acid linked with heart and blood vessel function. Pallian adds that this form is linked to blood pressure and cardiovascular support.

magnesium

Nature Made Magnesium

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Some people may still be interested in a magnesium oxide option due to affordability. While magnesium oxide is not as easy for your body to absorb as other forms of magnesium are, studies show that taking it can still be useful for constipation.

Nature Made provides 400 mg of magnesium from magnesium oxide. It’s also gluten-free and contains no artificial flavors or preservatives. For a softgel that provides nearly 100 percent of your daily magnesium needs, the price point may work. Just keep in mind that this option is more likely to cause digestive symptoms.

magnesium

Source Naturals Magnesium Malate

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Source Naturals blends magnesium with malic acid to support energy and muscle function. It provides 425 mg of magnesium from magnesium malate trihydrate.

Lindsay-Adler recommends this option for its straightforward formulation and quality standards. Source Naturals products are third-party tested and free of common allergens, including yeast, dairy, egg, gluten, soy, and wheat. It also contains no artificial colors, flavors, or preservatives.

magnesium

Jarrow Formulas Magnesium Taurate

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Jarrow Formulas Magnesium Taurate provides 300 mg of magnesium taurate to support cardiovascular and nervous system function. Although magnesium taurate is less commonly recommended than forms like glycinate or citrate, it has gained attention for its potential heart health benefits.

Research on magnesium taurate is still emerging. Taurine itself has been studied for its role in supporting heart and blood vessel function.

 While more research is needed, this product may appeal to people looking for magnesium with some additional heart health support.

What Are the Benefits of Magnesium?

“Magnesium is a vital mineral for human physiology, because it participates in hundreds of biochemical reactions that keep cells functioning normally,” says Pallian. Taking magnesium supplements isn’t necessary for everyone, but it may offer support for those who don’t get enough or need a higher therapeutic dose, research suggests.

The list of magnesium benefits is long, but the following are some of the most common ways magnesium supports health:

  • Sleep and Relaxation Magnesium plays a role in regulating your nervous system, which helps explain its connection to sleep. “Higher intakes of magnesium are linked to better sleep quality and duration,” says Zenker.

  • Muscle and Nerve Function “Magnesium is also an essential electrolyte, helping support proper muscle and nerve function, making it important for active adults,” says Snider. Low magnesium levels may contribute to muscle cramps or weakness in some people.

  • Digestive Health “Some types of magnesium, like oxide and citrate, are used like a laxative to stimulate bowel movements,” says Zenker. Magnesium citrate, in particular, is often chosen for occasional constipation, because it draws water into your intestines and tends to be more gentle than magnesium oxide.

  • Mood Taking magnesium may offer an additional tool to support anxiety and depression treatment. “Clinical research shows supplementation can produce meaningful improvements in mild-to-moderate depression and anxiety symptoms, often within two weeks, and may enhance the effects of antidepressant medications,” says Pallian.

  • Bone Health “Magnesium plays an important role in bone structure and bone building,” says Zenker. Some studies suggest supplementation may help support bone density, especially for postmenopausal women.

  • Blood Pressure “Magnesium may also contribute to blood pressure regulation,” says Pallian. “Meta-analyses of randomized controlled trials show supplementation leads to small but statistically significant reductions in systolic and diastolic blood pressure.”

What Foods Are High in Magnesium?

Magnesium is found in a wide variety of foods, mainly in plant-based options. “Magnesium is widely distributed across the food supply,” says Pallian. “Nuts, seeds, legumes, and whole grains consistently provide the greatest amounts, while fish, meats, and milk contribute moderate levels.” Some of the richest sources include pumpkin seeds, almonds, cashews, black beans, lentils, and whole grains like brown rice and whole-wheat bread.

Magnesium also appears in many everyday foods that you might not associate with the mineral. Pallian says that having peanut butter, bananas, avocados, yogurt, chocolate milk, cocoa-based products, and fortified breakfast cereals can all contribute to getting more magnesium.

Food is the ideal source of magnesium, but intake gaps of this nutrient are common. “Dietary intake data suggest that a significant proportion of adults, especially women, do not meet recommended magnesium intakes, making suboptimal intake fairly common,” says Corwin.

Are Magnesium Supplements Safe for Everyone?

Magnesium supplements are generally considered safe for healthy adults when taken as directed, but they aren’t appropriate for everyone. Digestive side effects are the most common issue, particularly at higher doses. “High intakes of magnesium from supplements can cause digestive symptoms like diarrhea, abdominal pain, and bloating,” says Zenker.

Having certain health conditions (like kidney disease) or taking certain medications warrants extra caution, too. “Magnesium can also interact with the absorption of certain meds, including some antibiotics and thyroid medications, so timing matters,” says Corwin.

 Stangland also emphasizes that taking more magnesium than recommended may lead to symptoms such as low blood pressure or muscle weakness in sensitive individuals.

What's more, be aware that your magnesium status isn’t always reflected in routine blood work. “About half of your magnesium is stored in bone, and most of the rest lives inside your cells — not floating in your bloodstream,” says Lindsay-Adler. “That’s why a normal blood-magnesium level does not always mean your body has enough.”

What Form of Magnesium Is Best?

There’s no single “best” magnesium form for everyone. “The choice depends on what you’re looking to address. The ‘best’ form is the one that aligns with your specific health needs,” says Stangland.

“For example, citrate is best supported for constipation, while glycinate is often preferred for general repletion, sleep, or stress support due to better tolerability,” says Corwin. “Claims that one form is universally superior are not supported by the evidence.” 

FAQ

Is it better to take magnesium citrate or magnesium glycinate?
It depends on your goal. Magnesium citrate is commonly used for constipation, while magnesium glycinate is generally preferred for sleep, relaxation, and overall magnesium repletion due to its good absorption and gentler effect on the stomach.

Daily magnesium supplementation may be right for you if your dietary intake is low and the dose is appropriate. However, since taking high amounts may cause digestive side effects or affect medications or health conditions, it’s a good idea to speak with your healthcare professional before starting.


Possible signs of low magnesium may include muscle cramps, twitching, fatigue, weakness, and restless legs. But these symptoms aren’t specific to magnesium deficiency. Because magnesium status isn’t always easy to assess solely from symptoms, it’s best to check with your healthcare professional if you’re concerned about your levels or if you’re considering supplementation.


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Resources
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