The 6 Best Magnesium Supplements, According to Registered Dietitians

Best Overall

Thorne Magnesium Bisglycinate

Best Overall

Thorne Magnesium Bisglycinate

ConsRequires that you drink it in 8 ounces of water

For a magnesium supplement that’s easy on the stomach, highly absorbable, and thoroughly tested, Thorne Magnesium Bisglycinate powder comes out on top. Each scoop is mixed with 8 ounces of water and contains 200 milligrams of magnesium. If you’ve experienced stomach troubles after taking magnesium in the past, this supplement may be a better option. “Since this form of magnesium doesn’t appear to have as much of a laxative effect as other magnesium products, many people seem to tolerate it better and have fewer unwanted digestive symptoms,” says Mitri.

If you’re looking for a better night’s sleep or to improve your stress levels, this form of magnesium may have some benefits. Research has found a cycle effect between stress and low magnesium levels. Low levels can make you more susceptible to stress, while high stress can deplete magnesium stores. “Magnesium bisglycinate is a form of magnesium that contains glycine, a neurotransmitter shown to promote rest and relaxation,” says Mitri.

Nature Made Magnesium Citrate

Best Buget Supplement

Nature Made Magnesium Citrate

Now 38% Off

At just $0.47 per dose, Nature Made Magnesium Citrate capsules are our favorite budget-friendly magnesium supplement. Even at a lower price, this choice is USP certified, so you know you’re getting everything the label says and nothing it doesn’t. Magnesium citrate is much more absorbable than magnesium oxide and generally easier on the stomach as well.

However, magnesium citrate is also the type of magnesium that is used in laxatives as it helps draw water into the intestines, although it won’t have the same effect as over the counter laxative medications containing the mineral. Each two-pill dose is 250 milligrams, so it can easily be halved to 125 milligrams if needed.

TypeMagnesium CitrateDose250 milligramsFormSoftgel capsulesCertificationsUSP

Best Magenesium Supplement for Low Doses

Klean Athlete Klean Magnesium

Best Magenesium Supplement for Low Doses

Klean Athlete Klean Magnesium

“I love the Klean Athlete brand; since they are NSF certified and have a rigorous research process, I always recommend it to athletes,” says Schlichter. This magnesium supplement features 125 milligrams of magnesium from magnesium glycinate. This form of magnesium is combined with the amino acid glycine, making it more absorbable than some other forms of magnesium and with less digestive side effects.

“I would caution people to start slow when supplementing and not automatically go to the higher end of daily intake (400 milligrams),” says Schlichter. You can easily start with a low to moderate dose of 125 milligrams with one capsule, taking another dose if more is needed.

TypeMagnesium glycinateDose120 milligramsFormCapsuleCertificationsNSF Certified

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Best Gummy Supplement

Garden of Life Dr. Formulated Magnesium Gummies

Best Gummy Supplement

Garden of Life Dr. Formulated Magnesium Gummies

Now 16% Off

ConsTo get the 1 billion CFUs of probiotics, four gummies are needed (with 400 milligrams of magnesium)

If you have trouble swallowing pills, Garden of Life Dr. Formulated Magnesium Gummies may be the best option. Every one-gummy serving contains 100 milligrams of magnesium citrate, one gram of prebiotic fiber, and 250 million CFUs of the probiotic Bacillus subtilis. These gummies are formulated to help promote relaxation and support gut, muscle, and bone health.

If you’re hoping you get your magnesium and probiotics in one supplement, this gummy does have it all, but a dose of 400 milligrams of magnesium is needed for 1 billion CFUs of probiotics, which is above the tolerable upper limit for supplemental magnesium. “Magnesium-rich foods are generally rich in other important nutrients, like fiber, antioxidants and micronutrients, so getting more magnesium through the diet should be a priority,” says Schlichter.

TypeMagnesium CitrateDose400 milligrams (for 4 gummies)FormGummyCertificationsNSF Certified

Best for Athletes

GU Roctane Magnesium Plus

Best for Athletes

GU Roctane Magnesium Plus

ConsOne dose is two pills, which may be difficult for some people to swallow

If you prioritize recovery after hard workouts, GU Roctane Magnesium Plus provides magnesium and other nutrients to support healthy muscles and bones while optimizing recovery. Each serving of two pills has 200 milligrams of easily absorbable magnesium citrate, 250% DV vitamin D, 133% DV vitamin K, and 182% DV zinc. Vitamin D and Vitamin K work together to reduce the risk of fractures while supporting heart health by inhibiting calcification of the vascular system.

Including zinc as zinc gluconate helps support muscle cell activation, proliferation, and differentiation, all of which help promote muscle regeneration. This is especially important for athletes, as research has found that the oxidative stress induced by exercise may actually lead to the depletion of zinc levels in the body.

TypeMagnesium CitrateDose200 milligramsFormCapsulesCertificationsInformed Choice

Best for Sleep

Momentous Magnesium L-Threonate

Best for Sleep

Momentous Magnesium L-Threonate

ConsOne serving is 3 pills, which may be a lot for some people to take

Magnesium L-Threonate may be the best option if you’re looking to support sleep, focus, and overall cognition. Research has found that this form of magnesium is the most absorbable and retainable compared to magnesium combined with chloride, citrate, glycinate, and gluconate. It also appears to have the largest impact on brain and spinal cord magnesium levels.

To support relaxation and sleep, magnesium plays a role in melatonin regulation and binds to GABA receptors in the brain, helping to settle down nerve activity and promote relaxation. One serving of Monumentous Magnesium L-Threonate is 145 milligrams of magnesium, obtained from 2 grams of Magtein®, the exact compound and amount used in studies showing improvements in memory and cognition.

TypeMagnesium L-ThreonateDose145 milligramsFormCapsulesCertificationsInformed Choice

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Magnesium Supplement Benefits

With all the above being said, the active set may particularly benefit from magnesium supplements. “There’s some evidence that athletes may need more magnesium than less active adults, possibly because the body uses more magnesium during exercise,” says Yawitz. “In one small study, magnesium supplements appeared to help reduce muscle damage after a multistage bike race. Overall, though, the research is mixed on whether supplements are helpful for exercise performance.”

In healthy adults, Yawitz also points out, there’s some evidence that magnesium supplements may improve sleep and mood in those prone to insomnia and depression.“In one meta-analysis, adults taking magnesium supplements fell asleep an average of 17 minutes faster and slept 16 minutes longer per night than those taking a placebo,” she says. “And in another large study, young adults taking magnesium reported better sleep quality than those who didn’t take it.” In yet another study, Yawitz explains that adults with mild to moderate depression saw significant improvements in depression and anxiety symptoms after taking magnesium supplements for just six weeks.

Taking magnesium supplements may be useful for those with chronic disease. “One meta-analysis also suggests that magnesium supplements could help reduce the odds of type 2 diabetes, heart disease, hypertension, and other chronic illnesses by reducing systemic inflammation,” says Yawitz.

How Much Magnesium Do You Actually Need Everyday?

Healthy adult males require about 400 to 420 milligrams (mg) of magnesium per day, says Yawitz. “Your ideal supplement dose depends on how much you’re getting through your diet,” she says, adding that an app like Cronometer can help you estimate your daily intake, so you don’t overdo it on supplements (which can cause diarrhea, nausea, vomiting, and other side effects).

“Regardless of dietary intake, I always suggest starting at a low dose of 100 to 150 milligrams (mg) per day and taking no more than 300 mg per day,” says Yawitz. “Keep in mind that certain medications—like antacids and laxatives—often contain magnesium,” she continues, stressing that you should check with your doctor or pharmacist before starting a supplement, especially if you take prescription or over-the-counter meds.

Which is the Best Form of Magnesium to Take?

There are several different types of magnesium supplements on the market. Kieran McSorley, RD, of Brentwood Physiotherapy, goes by the quote, “The best form of magnesium is the one that your body absorbs best.” As McSorley highlights, magnesium is available in several forms, including magnesium oxide, magnesium citrate, magnesium glycinate, and magnesium chloride. “The form of magnesium you choose may depend on the reason you are taking it, as well as any potential side effects you may experience,” he says. “Some forms of magnesium can cause digestive upset, while others are better tolerated. It’s important to work with a healthcare provider to determine the best form of magnesium for your individual needs.”

Pallini Winnifred, RDN, of FitDominium says that the best form of magnesium is the kind that your body can absorb and use the most easily. “The bioavailability of magnesium, which refers to how well the body can absorb and use the mineral, might vary between different forms,” says Winnifred. “Many people handle some magnesium salts well, including magnesium citrate and magnesium glycinate, which are both highly accessible forms of the mineral. On the other hand, magnesium oxide is less bioavailable, but because it is cheap, it is often used as a dietary supplement.”

Some registered dietitians such as Mary Sabat, RDN, owner of BodyDesigns, single out magnesium glycinate in particular. “It is a chelated form of magnesium that is easily absorbed by the body, making it an effective way to supplement your magnesium levels,” she says.

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Side Effects of Magnesium Deficiency

You need adequate magnesium to live. “Magnesium is important for many body functions, such as energy metabolism, protein synthesis, and nerve function,” says Winnifred.

According to Winnifred, here are just a few of the not-so-fun symptoms that may result from not getting enough magnesium: Exhaustion, muscle cramps, weakness, irritability, and trouble sleeping. “Magnesium deficiency can, in extreme situations, cause seizures, cardiac problems, and other medical complications,” she adds. As always, consult with a trusted healthcare professional if you’re concerned you’re not getting enough magnesium in your diet.

Foods Highest in Magnesium

For adult men, says Winnifred, it is advised to strive for a daily magnesium intake of 400 to 420 mg. To get your fix, she recommends dark, leafy greens like spinach (1 cup has 157 mg of magnesium), almonds (1 oz contains 80 mg of magnesium), and black beans (1 cup contains 120 mg of magnesium). Salmon, avocados, and bananas are also excellent suppliers of magnesium,” she adds.

Sabat also calls out the dark leafy green Swiss chard and pumpkin seeds for their impressive nutrition specs, particularly when it comes to magnesium. “A one cup serving of cooked Swiss chard contains 150mg, and a one ounce serving of pumpkin seeds contains 150mg,” she says, noting that spinach and Swiss chard are both excellent sources of vitamin A and vitamin C, while pumpkin seeds are also a good source of fiber and protein.

Meet the Experts

Melissa Mitri, MS, RD, a registered dietitian, nutrition writer and owner of Melissa Mitri Nutrition.Sarah Schlichter, MPH, RDN, is a registered dietitian and writer at Bucket List Tummy.Kieran McSorley, RD, is a registered dietician at Brentwood Physiotherapy.Kim Yawitz, RD, is a registered dietitian and gym owner of CrossFit 26 in St. Louis, MOPallini Winnifred, RDN, is a registered dietitian at FitDominium.Mary Sabat, M.S., RDN, is a registered dietitian and owner of BodyDesigns.

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