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Magnesium supplements, compared

13 products we’ve reviewed list magnesium as a key ingredient. Here’s what it does, what the research uses — and how much each product actually contains.

What it is

A mineral involved in hundreds of enzyme reactions, including muscle and nerve function. Forms that dissolve well in liquid, such as citrate, lactate and chloride, are absorbed more completely than oxide and sulfate.

What the research uses

Adults need 310–420 mg a day from all sources. The upper limit for magnesium from supplements is 350 mg a day for adults; more commonly causes diarrhea.

Magnesium can interact with some medications, including certain antibiotics and osteoporosis drugs.

Educational information, not medical advice. Talk to a healthcare professional before starting a supplement, especially if you are pregnant, nursing or take medication.

Every product, dose by dose

ProductMagnesium per servingFormScore
Multi for Him
Nature MadeMulti for Him
USP Verified
100 mgMagnesium (as magnesium oxide)Tablet8.5
Gold Standard 100% Casein
Optimum NutritionGold Standard 100% Casein		500 mg / 85 mg / 11 mgCalcium, magnesium and zincPowder8.1
Adults Multivitamin
CentrumAdults Multivitamin		50 mgMagnesium (as magnesium oxide)Tablet8.0
High Absorption Magnesium (Lysinate Glycinate)
Doctor's BestHigh Absorption Magnesium (Lysinate Glycinate)		200 mg (from 2,000 mg chelate)Magnesium (from magnesium lysinate glycinate chelate, Albion TRAACS)Tablet7.9
Magnesium (Glycinate)
Pure EncapsulationsMagnesium (Glycinate)
Certified Gluten-FreeThird-party testedcGMP facility
120 mg per capsuleMagnesium (as magnesium glycinate)Capsule7.9
Sport Electrolyte Tablets
NuunSport Electrolyte Tablets
Informed ChoiceCertified Gluten-FreeKosherCertified VeganNon-GMO Project Verified
25 mgTablet7.9
Essential for Women 18+
RitualEssential for Women 18+
USP VerifiedNon-GMO Project VerifiedClean Label Project
30 mgMagnesium (as dimagnesium malate)Capsule7.5
Original Electrolyte Powder (ORS)
DripDropOriginal Electrolyte Powder (ORS)
Kosher
40 mg, 70 mg, 1.5 mgMagnesium, vitamin C and zincStick pack7.5
Zero-Sugar Electrolyte Drink Mix
LMNTZero-Sugar Electrolyte Drink Mix
Third-party testedcGMP facility
60 mgMagnesium (magnesium malate)Stick pack7.3
Neuro-Mag Magnesium L-Threonate
Life ExtensionNeuro-Mag Magnesium L-Threonate
cGMP facilityThird-party tested
2,000 mgMagnesium L-threonate (Magtein)144 mgElemental magnesiumCapsule7.2
Replenisher Daily Electrolyte Drink Mix
UltimaReplenisher Daily Electrolyte Drink Mix
Non-GMO Project Verified
100 mgPowder7.2
Dream Sleep Powder
BeamDream Sleep Powder
Third-party testedcGMP facility
60 mgMagnesium (citrate, dimagnesium malate)Powder6.7
Magnesi-Om
Moon JuiceMagnesi-Om
Third-party tested
310 mgMagnesium (citrate, gluconate, acetyl taurinate)Powder6.5

Amounts are per serving as printed on each label. “Not disclosed” usually means the ingredient sits inside a proprietary blend.

Questions people ask

How much magnesium do studies use?
Adults need 310–420 mg a day from all sources. The upper limit for magnesium from supplements is 350 mg a day for adults; more commonly causes diarrhea.
Which magnesium supplement scores highest?
In our reviews, Nature Made Multi for Him scores highest at 8.5/10, followed by Optimum Nutrition Gold Standard 100% Casein (8.1) and Centrum Adults Multivitamin (8.0). Scores weigh efficacy, quality, value, experience and transparency — not just the dose.
How much magnesium is in these products?
It varies by product and serving size — for example Nature Made Multi for Him (100 mg), Optimum Nutrition Gold Standard 100% Casein (500 mg / 85 mg / 11 mg), Centrum Adults Multivitamin (50 mg). The table above lists the amount per serving for every product we've reviewed.

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