The Best Magnesium Supplements of 2026, According to Experts

Forbes Health published its 2026 ranking of the best magnesium supplements on March 18, drawing on recommendations from a three-expert panel and product analysis that weighted price per serving, customer ratings, and third-party testing. The list spans eight products across five magnesium forms, from a 400 milligram oxide tablet priced at 24 cents per serving to a 150 milligram liquid formula at 33 cents per serving. Nature Made Extra Strength Magnesium Oxide earned the top spot with a 5.0 rating.

The expert panel included Toby Amidor, a registered dietitian and Forbes Health Advisory Board member; Taylor Wallace, a food scientist and fellow of the American College of Nutrition; and Bojana Jankovic Weatherly, an internal medicine and integrative medicine physician. The Forbes Health editorial team combined their recommendations with a product-level analysis of cost per tablet and verified customer reviews to produce a ranked list, excluding Nature’s Bounty review scores in light of a 2023 Federal Trade Commission action against that company’s parent for alleged review manipulation on Amazon.

Magnesium regulates more than 300 enzymatic processes in the body, including protein synthesis, muscle and nerve function, blood pressure control, and glucose metabolism. Roughly 60 percent of the body’s magnesium is stored in bone, where it contributes to bone-building cell activity and calcium regulation through the parathyroid hormone. Deficiency is rare in healthy adults, but risk increases with gastrointestinal conditions such as Crohn’s disease, type 2 diabetes, alcohol dependence, and older age, when both dietary intake and renal retention tend to decline.

The 2026 rankings

The products are split across four main magnesium forms. Nature Made Extra Strength Magnesium Oxide (400 milligrams, 24 cents per serving) took the top rating of 5.0 for variety and availability. Mag-Ox Magnesium Supplement (483 milligrams, 53 cents per serving) was rated 4.7 for value. Nature Made Magnesium Citrate (250 milligrams, 39 cents per serving) was rated 4.5 and flagged as the best option for absorption. KAL Magnesium Glycinate (350 milligrams, 40 cents per serving) tied at 4.5 and was designated the best choice for relaxation and sleep. Nature’s Bounty Magnesium (500 milligrams, 6 cents per serving) came in at 4.4 as the best high-dose option. NOW Foods Magnesium Citrate (200 milligrams, 40 cents per serving) earned 4.2 for vegan friendliness, while BioEmblem Triple Magnesium Complex (300 milligrams, 62 cents per serving) was rated 3.9 as the best multi-form blend. RnA ReSet ReMag High Absorption Magnesium Liquid (150 milligrams, 33 cents per serving) closed the list at 3.5.

Two additional products appeared outside the main ranking as featured partner picks: Transparent Labs Magnesium Bisglycinate, a 300 milligram formula that is third-party tested and Informed Choice Certified, and Ritual Magnesium+ Bisglycinate, a two-in-one blend combining magnesium bisglycinate with tart cherry for sleep support.

What the research says about magnesium forms

The form of magnesium in a supplement determines how much of it reaches circulation. A 2025 randomized, placebo-controlled trial published in Nature and Science of Sleep found that magnesium bisglycinate supplementation improved sleep quality, shortened sleep onset latency, and extended total sleep time in healthy adults who reported poor sleep at baseline. A separate 2022 meta-analysis of randomized controlled trials in Nutrients, drawing on data from multiple RCTs, concluded that oral magnesium supplementation reduced serum C-reactive protein and other inflammatory markers relative to placebo.

In practice, the absorption hierarchy matters. Magnesium oxide is the least expensive per milligram but has the lowest bioavailability, meaning a smaller fraction of the labeled dose is absorbed. Magnesium citrate sits in the middle tier on both cost and absorption. Magnesium glycinate and bisglycinate, in which the mineral is chelated to the amino acid glycine, are more bioavailable and less likely to cause the gastrointestinal side effects that higher doses of oxide or citrate can produce. Liquid and chelated forms are generally absorbed more completely than unchelated tablet forms.

Forbes Health also cited a small trial in which 46 older adults who received 500 milligrams of magnesium daily for eight weeks experienced improvements in sleep quality, time to sleep onset, and total sleep duration, consistent with the 2025 bisglycinate findings. The American Academy of Neurology and the American Headache Society both recognize magnesium as a potentially effective therapy for migraine prevention, though the effective doses in those trials exceed the recommended dietary allowance and should only be used under medical supervision.

How to choose a supplement

The Forbes Health methodology prioritized third-party testing, which verifies that a product contains the ingredients and doses listed on its label. The methodology also considered cost per serving and customer ratings, adjusted for known review manipulation issues. When choosing between forms, the trade-off is straightforward: oxide and citrate are cheaper but more likely to cause loose stools at higher doses, while glycinate and bisglycinate are better tolerated and better absorbed but cost more per serving.

Anyone considering magnesium supplementation should first confirm with their doctor that it is appropriate for their specific health needs. Magnesium can interact with bisphosphonates, certain antibiotics, diuretics, and proton pump inhibitors. High doses may cause diarrhea, nausea, and abdominal cramping, and very high chronic intake has been associated with low blood pressure and abnormal heart rhythms.

References

1. Magnesium bisglycinate supplementation in healthy adults reporting poor sleep: a randomized, placebo-controlled trial. Nature and Science of Sleep. 2025. https://www.tandfonline.com/doi/abs/10.2147/NSS.S524348
2. Effect of magnesium supplementation on inflammatory parameters: a meta-analysis of randomized controlled trials. Nutrients 14(3):679. 2022. https://www.mdpi.com/2072-6643/14/3/679