Best Magnesium Supplement (2026): Complete Buying Guide
The best magnesium supplement for most people is Revive MD Pure Magnesium Glycinate 200 mg: 200 mg of magnesium in 2 capsules for $0.33 a day, on the Informed Sport list. For a USP Verified product, see Nature Made Magnesium Glycinate 200mg or, if price matters more, Nature Made Magnesium Citrate.
By Erin Rose Updated October 29, 2026 How we score
Our top picks at a glance
- Revive MD Pure Magnesium Glycinate 200 mgOur pick. 200 mg in 2 capsules, Informed Sport, $0.33 a day.Check price
- Nature Made Magnesium CitrateThe other form to consider. USP Verified.Check price
- KAL Magnesium Glycinate 350 mg240 capsules, about 88 mg each. One serving (4 capsules, 350 mg) is the whole limit. Not on a testing list.Check price
- Thorne Magnesium GlycinateOn NSF/ANSI 173. $0.29 a capsule (120 mg).Check price
- Nature’s Truth Magnesium GlycinateGlycinate only, on NSF/ANSI 173. 200 mg in 2 capsules.Check price
Our pick for: Most people
- Magnesium
- 200 mg a serving2 capsules, as glycinate
- A day
- $0.33one serving, Revive MD’s own price
- Testing list
- Informed Sportbatches tested for banned drugs
- Form
- Glycinateoften called gentle on the stomach
- Bottle
- 60 servings, $19.99Revive MD’s own price
- Per 300 mg
- $0.501½ servings
Our take
Why we pick it It is pure glycinate: 200 mg of magnesium in 2 capsules, for $0.33 a day at Revive MD’s own price. That is less than half of Nature Made Magnesium Glycinate 200mg ($0.73 a day at list price). Glycinate is a form many people choose because it is gentle on the stomach. Of the everyday forms, glycinate and citrate are the two to choose from; oxide is cheap but mostly not absorbed, and L-threonate gives little magnesium for its price.
What to know On the Informed Sport list: every batch is tested for drugs banned in sport. It is not a check of the label. If you want a check of what is in the bottle, Nature Made Magnesium Glycinate 200mg is USP Verified and has the top score of the glycinates we score (8.0/10), at $0.73 a day. Nature Made’s own citrate is also USP Verified. No trial shows glycinate works better than citrate.
Testing record
- Informed Sport: Revive, Magnesium Glycinate, capsule. Every batch is tested for drugs banned in sport. It is not a contents check. See the listing
Two more picks for different needs, both on a testing list (USP Verified or NSF/ANSI 173). A score compares a product only with others of the same form. So the citrate’s 9.0 means it is a strong citrate; it does not mean it beats our glycinate pick. Glycinate or citrate?
Our pick for: A USP Verified citrate
Nature Made Magnesium Citrate 250 mg
9.0/10 Our score
9.0/10, the top score of the 3 citrates we score
Good
- On the USP Verified list (checked October 14, 2026)
- 250 mg of magnesium per serving (adults: at most 350 mg a day from supplements)
- Label states the amount, with no blend
Watch for
- Costs 2 times as much per dose at list price as the cheapest of its kind we score
- Magnesium
- 250 mg a serving2 softgels, as citrate
- A serving
- $0.39250 mg, Nature Made’s list price
- Testing list
- USP Verified
- Form
- Citrateabsorbed better than oxide (NIH)
- Bottle
- 120-count bottle, $23.59Nature Made’s list price
- Per 300 mg
- $0.471.2 servings
Our take
250 mg of magnesium as citrate in 2 softgels, on USP Verified, for $0.39 a serving at list price. It has the top score of the citrates we score. In small studies, citrate was absorbed better than oxide (NIH). It can loosen stools at higher doses; if it does, switch to glycinate. Glycinate vs citrate.
The label
Testing record
- USP Verified: contents and purity Checked October 14, 2026.
Not found on: NSF Certified for Sport, Informed Sport, Informed Choice, NSF/ANSI 173.
Our pick for: Setting your own dose, tested
Good
- On the NSF/ANSI 173 list (checked October 14, 2026)
- Label states the amount, with no blend
- No FDA recall for the brand in 24 months
Watch for
- 120 mg of magnesium per serving (adults: at most 350 mg a day from supplements)
- Costs 2.4 times as much per dose at list price as the cheapest of its kind we score
- Magnesium
- 120 mg a capsuleas glycinate
- A capsule
- $0.29120 mg, Thorne’s list price
- Testing list
- NSF/ANSI 173
- Take
- 1 or 2 capsules120 or 240 mg
- Bottle
- 90-serving bottle, $26.00Thorne’s list price
- 2 capsules
- $0.58240 mg, list price
Our take
The same glycinate form as our pick, in smaller 120 mg capsules, so you can take 1 or 2. The capsules are on NSF/ANSI 173, an outside check of what is in the bottle (Thorne’s NSF Certified for Sport listing is for its powder, not these capsules). Its label allows up to 4 capsules (480 mg), more than you should take from pills, so stop at 2. Thorne vs Doctor’s Best.
Label and testing record: on our best magnesium glycinate page
How to Choose: Quick Decision Matrix
| Your situation | What to buy |
|---|---|
| You want one magnesium supplement | Revive MD Pure Magnesium Glycinate 200 mg, $0.33 a day (our pick) |
| You want glycinate that is USP Verified | Nature Made Magnesium Glycinate 200mg, $0.73 a day at list price; the top score of the glycinates we score |
| You want a citrate on the USP Verified list | Nature Made Magnesium Citrate 250 mg, $0.39 a day for 250 mg (above) |
| You want to set your own dose | Thorne Magnesium Glycinate, 120 mg a capsule, on NSF/ANSI 173, $0.29 a capsule (above) |
| You want it for sleep | Glycinate, our pick at 200 mg in the evening; the benefit in trials was small. Best magnesium for sleep |
| You want it for constipation | Nature Made Magnesium Oxide 250 mg, $0.06 a tablet (250 mg); oxide is the form tested for constipation. Best magnesium for constipation · oxide vs citrate |
| You get leg cramps | Magnesium mostly does not prevent cramps in older adults (Cochrane review). What the cramp trials found |
| You want a gummy | Nature Made Magnesium Glycinate Gummies 100 mg, 100 mg in 2 gummies, USP Verified. Magnesium gummies |
| You want the lowest cost per mg, any list | NOW Magnesium Citrate 200 mg, $0.24 per 300 mg at list price. One serving (400 mg) is over the limit; take 1 tablet (200 mg). |
| You want a powder to mix in water | Natural Vitality Calm Magnesium Citrate Powder (citrate), $0.27 per 300 mg; set the dose with the scoop |
| You want L-threonate | Double Wood Magnesium L-Threonate, the lowest cost of the 3 we price ($2.15 per 300 mg); little human evidence |
| You want a glycinate powder on a testing list | Codeage’s and Thorne’s glycinate powders are on a testing list, and their labels say glycinate only. Every glycinate on a testing list |
Testing: 4 of the 15 magnesium products we score are on a public testing list (USP Verified or NSF/ANSI 173), checked October 14, 2026. Which glycinate is on which list.
Why We Recommend Magnesium Glycinate as the Best Overall Form
Glycinate and citrate are both good everyday forms. We lead with glycinate for two reasons, and neither is that it works better:
- The stomach. Too much magnesium from pills mostly causes diarrhea (NIH). Glycinate is not on NIH’s list of forms most linked to diarrhea, and in one small trial it was better tolerated than oxide (Schuette 1994). Citrate can loosen stools.
- A tested product at a sensible dose. Our pick is on the Informed Sport list (every batch is tested for drugs banned in sport) and gives 200 mg in one serving.
What the evidence does not show: that glycinate absorbs better than citrate (NIH names citrate, not glycinate, among the better-absorbed forms), or that glycine in it helps sleep. Glycine on its own has been studied for sleep (Bannai 2012), but whether glycinate does more than other forms has not been tested. L-threonate raised brain magnesium in rats (Slutsky 2010); human data is small.
| Item | Value |
|---|---|
| Oxide: Nature Made Magnesium Oxide 250 mg | $0.071 |
| Citrate: NOW Magnesium Citrate 200 mg | $0.24 |
| Glycinate: Nutricost Magnesium Glycinate 210 mg | $0.30 |
| L-threonate: Double Wood Magnesium L-Threonate | $2.15 |
| Gummy: Vitamatic Magnesium Citrate Gummies 600 mg | $2.86 |
All 17 magnesium products we track, and how we score them
| Product | Score | Magnesium | Per 300 mg | Testing list | Buy |
|---|---|---|---|---|---|
| Nutricost Magnesium Glycinate 210 mgGlycinate | 8.5/10 | 210 mg3 capsules | $0.30 | Not found* | Check price |
| Nature Made Magnesium Glycinate 200mgGlycinate | 8.0/10 | 200 mg2 capsules | $1.10 | USP Verified | Check price |
| Doctor's Best High Absorption MagnesiumGlycinate | 7.0/10 | 200 mg2 tablets | $0.30 | Not found* | Check price |
| NOW Magnesium Bisglycinate PowderGlycinate | 7.0/10 | 300 mg1 level teaspoon | $0.32 | Not found* | Check price |
| Thorne Magnesium GlycinateGlycinate | 6.5/10 | 120 mg1 capsule | $0.72 | NSF/ANSI 173 | Check price |
| NOW Magnesium Glycinate 200 mgGlycinate | 6.0/10 | 200 mg2 tablets | $0.53 | Not found* | Check price |
| Nature Made Magnesium Citrate 250 mgCitrate | 9.0/10 | 250 mg2 softgels | $0.47 | USP Verified | Check price |
| NOW Magnesium Citrate 200 mgCitrate | 7.0/10 | 400 mg2 tablets | $0.24 | Not found* | Check price |
| Natural Vitality Calm Magnesium Citrate PowderCitrate | 7.0/10 | 350 mg2 tsp (4 g) powder in water | $0.27 | Not found* | Check price |
| Nature Made Magnesium Oxide 250 mgOxide | 7.0/10 | 250 mg1 tablet | $0.071 | Not found* | Check price |
| Double Wood Magnesium L-ThreonateL-threonate | 5.5/10 | 144 mg4 capsules | $2.15 | Not found* | Check price |
| Life Extension Neuro-Mag Magnesium L-ThreonateL-threonate | 5.5/10 | 144 mg3 capsules | $2.19 | Not found* | Check price |
| NOW Magtein Magnesium L-ThreonateL-threonate | 4.5/10 | 144 mg3 capsules | $3.47 | Not found* | Check price |
| Nature Made Magnesium Glycinate Gummies 100 mgGummy | 8.5/10 | 100 mg2 gummies | $3.15 | USP Verified | Check price |
| Vitamatic Magnesium Citrate Gummies 600 mgGummy | 4.0/10 | 70 mg2 gummies | $2.86 | Not found* | Check price |
| KAL Magnesium Glycinate 350 mgGlycinate | — | 350 mg4 capsules | No list price | Not found* | Check price |
| Nature's Bounty High Absorption Magnesium Glycinate 240 mgGlycinate | — | 240 mg2 capsules | No list price | Not found* | Check price |
* Not found on NSF/ANSI 173, NSF Certified for Sport, USP Verified, Informed Choice or Informed Sport (searched October 14, 2026). A dash means we could not score it: KAL and Nature’s Bounty have no list price we could check.
The score. Out of 10, from five checks (scores rebuilt October 14, 2026; how we score):
- Testing, up to 3 points: the product is on a public testing list. A brand’s own claim, with no listing, earns half.
- Dose, up to 3 points: a serving gives a full dose of magnesium without going over the upper limit.
- Cost, up to 2 points: what 300 mg of magnesium costs, compared with the cheapest in the same form.
- Label, up to 1 point: the label states every amount.
- Recalls, up to 1 point: no FDA recall naming the brand in 24 months.
What Makes a Good Magnesium Supplement?
- Form. Glycinate or citrate for everyday use. Oxide is about 4% absorbed in one study (Firoz 2001). The 8 forms compared.
- Dose. The “Magnesium” line on the Supplement Facts panel is the magnesium itself (the elemental amount), not the weight of the whole compound (NIH). Count it times the servings you take, and stay at or under the limit. Our dosage guide.
- An outside check. A listing on USP Verified or NSF/ANSI 173 means an outside lab checks that the bottle holds what the label says. “Third-party tested” printed on a label, with no program named, is the brand’s word.
- Cost per mg of magnesium. Not per bottle or per pill. We compare every product on 300 mg of magnesium at the brand’s list price.
What We Don't Recommend
- Magnesium oxide to raise your magnesium. It is the cheapest per mg, but about 4% was absorbed in one study (Firoz 2001). It is a reasonable buy for constipation: in 2 trials, 68% improved on oxide vs 19% on placebo (van der Schoot 2023). Nature Made Magnesium Oxide 250 mg is $0.06 a tablet if that is your goal.
- Labels that hide the magnesium. If the panel gives only the compound weight, you cannot tell your dose. A “1,000 mg magnesium glycinate” capsule holds about 140 mg of magnesium.
- “Glycinate” blends with oxide. Read the words in brackets on the magnesium line. In November 2025, Health Canada recalled two bisglycinate products that held oxide the label did not list. How to check.
- Gummies, if you need a full dose. Nature Made Magnesium Glycinate Gummies 100 mg (USP Verified) give 100 mg in 2 gummies; a capsule gives twice that.
For intake by age and sex, see how much magnesium for seniors and how much per day for women.
What we could and could not verify about magnesium
We searched the five public testing lists for every product here on October 14, 2026: 4 of the 15 we score are on one. No magnesium we track is on Informed Choice or Informed Sport. We checked every label on the brand’s own page or NIH’s label database. We could not get list prices for KAL’s 240-capsule bottle or Nature’s Bounty.
The magnesium shelf, in numbers
We read 833 magnesium labels in the NIH Dietary Supplement Label Database. The median serving was 250 mg, but following the label’s directions took the median day to 399 mg, above the upper limit. Among the products we price, 300 mg of magnesium costs from $0.071 (oxide) to $3.47 (L-threonate). With a gap that wide, compare the form and the testing list before the price.
Frequently Asked Questions
What is the best magnesium supplement?
For most people, Revive MD Pure Magnesium Glycinate 200 mg: 200 mg in 2 capsules, on the Informed Sport list, $0.33 a day at Revive MD’s own price. If you want a USP Verified product, Nature Made Magnesium Glycinate has the top score of the glycinates we score, and Nature Made Magnesium Citrate is also USP Verified.
What is the best magnesium brand?
Choose the product, not the brand: a brand can have one product on a testing list and others off it. Revive MD’s glycinate is on Informed Sport, which tests every batch for drugs banned in sport. Nature Made’s glycinate and citrate are on USP Verified (its oxide is not); Thorne’s glycinate capsules are on NSF/ANSI 173. Which glycinate is on which list.
How do I choose between magnesium forms?
Glycinate or citrate for everyday use. Citrate was absorbed better than oxide in small studies (NIH); glycinate was better tolerated than oxide in one small trial (Schuette 1994). L-threonate is costly with little human data. Oxide is cheap but mostly not absorbed; it is used for constipation. Every form compared.
How much magnesium should I take?
Adults need 310 to 420 mg a day from food and supplements together. The upper limit for adults is 350 mg a day of magnesium from supplements and medicines. Food does not count toward it (NIH). Our dosage guide.
Which magnesium is best for sleep?
No form is proven best. Sleep trials of plain magnesium used 250 to 729 mg of magnesium a day, including a 2025 trial of 250 mg as glycinate (Schuster 2025). Trials of magnesium L-threonate are separate: they used 1 to 2 g of the compound, about 72 to 144 mg of magnesium. A 2025 glycinate trial found a small benefit over placebo after 4 weeks. Magnesium and sleep.
All Magnesium Guides
- All 8 forms compared: glycinate, citrate, chloride, malate, taurate, L-threonate, oxide, sulfate
- Best magnesium glycinate · what every glycinate costs · third-party tested glycinate · cheapest glycinate
- Magnesium and sleep · muscle cramps · glycinate vs citrate · Thorne vs Doctor’s Best
- Magnesium gummies · dosage guide · deficiency signs · for seniors · magnesium guide
Sources
- NIH Office of Dietary Supplements. Magnesium fact sheet for health professionals (updated January 6, 2026; read October 14, 2026).
- Firoz M, Graber M. Bioavailability of US commercial magnesium preparations. Magnes Res. 2001. PubMed 11794633
- Pardo MR, et al. Bioavailability of magnesium food supplements: a systematic review. Nutrition. 2021. PubMed 34111673
- Bannai M, Kawai N. New therapeutic strategy for amino acid medicine: glycine improves the quality of sleep. J Pharmacol Sci. 2012. PubMed 22293292
- Slutsky I, et al. Enhancement of learning and memory by elevating brain magnesium. Neuron. 2010 (rats). PubMed 20152124
- Schuster J, et al. Magnesium bisglycinate supplementation in healthy adults reporting poor sleep: a randomized, placebo-controlled trial. Nat Sci Sleep. 2025. PubMed 40918053
- Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults. BMC Complement Med Ther. 2021. PubMed 33865376
- van der Schoot A, et al. The effect of food, vitamin, or mineral supplements on chronic constipation in adults. Neurogastroenterol Motil. 2023. PubMed 37243443
- Labels: each brand’s page or the NIH Dietary Supplement Label Database (833 magnesium labels read August 29, 2026). Testing: five public lists searched October 14, 2026. Prices: each brand’s own list price, checked October 14, 2026.