A form of magnesium
Magnesium oxide supplements
5,110 magnesium products in the NIH label database list magnesium as magnesium oxide (34% of the 15,088 magnesium products); their median is 100 mg of magnesium per serving, against 86 mg across all magnesium products; the 186 whose only supplement ingredient is magnesium list a median of 400 mg (DSLD version 9.4.0, January 2026).
How does magnesium oxide compare with the other forms?
The median amount of magnesium per serving in products naming each form; the count in brackets. The amount is the magnesium the label gives, as printed (the Supplement Facts row normally states the element; a row named as the compound usually gives the compound's weight and is left out of these figures).
Median magnesium per serving by form
Source: Supplement Facts rows and their forms, NIH ODS Dietary Supplement Label Database version 9.4.0, current labels.
- Products
- 5,1103,778 on the market
- Median magnesium per serving
- 100 mgall magnesium products: 86 mg
- Share of magnesium products
- 34%5,110 of 15,088
Is the amount the magnesium or the whole magnesium oxide?
A Supplement Facts row normally states the magnesium itself (a row like "Magnesium (as magnesium oxide)"); a row named as the compound (a row like "Magnesium oxide") usually states the compound's weight, which includes what the magnesium is bound to and is larger than the magnesium it supplies. The front of a bottle may print either. Of the 5,110 products here, 5,047 give the magnesium in its own row (60 of them an amount far outside what other labels list, or one their own %DV disagrees with); 36 give only a row named as the compound, left out of the medians and counts on this site; 27 give no amount of their own or one in another unit.
The adult Tolerable Upper Intake Level for magnesium is 350 mg a day; it covers magnesium from supplements and medicines only, not food or water. At the most servings their labels direct, 1,037 of the 4,987 magnesium oxide products with a plausible amount (20.8%) give more than that.
Source: Supplement Facts rows of each product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0; upper limit: Institute of Medicine Dietary Reference Intakes (2011) (what counts as plausible).
What else do these products contain?
| Ingredient | Share of these products | Median here | Median, all products |
|---|---|---|---|
| Calcium | 73% | 200 mg | 115 mg |
| Zinc | 67% | 15 mg | 11 mg |
| Vitamin C | 65% | 150 mg | 100 mg |
| Vitamin B6 | 64% | 10 mg | 6 mg |
| Vitamin D | 63% | 10 mcg | 15 mcg |
| Vitamin B12 | 59% | 30 mcg | 36 mcg |
| Niacin | 57% | 25 mg | 20 mg |
| Folate | 56% | 400 mcg | 400 mcg |
| Thiamin | 56% | 7.5 mg | 5 mg |
| Riboflavin | 55% | 7.5 mg | 4 mg |
Which products are they?
60 of the 5,110 (on-market products first, the newest label first), ordered by the amount of magnesium per serving, largest first; an amount that looks like a slip or a compound's weight comes last, marked.
- Magnesium Potassium AspartateCountry Life Target-Mins600 mg
- Cal-Mag Citrate with Vitamin D-3 & K-2 2:1 RatioSolaray500 mg
- Calcium Magnesium ZincSolaray500 mg
- Enhanced Absorption Calcium Magnesium 2:1 RatioSolaray500 mg
- BP LifelineInfinite Age480 mg
- Osteo 4000 Calciumchiropractor's blend450 mg
- ZmaNOW Sports450 mg
- Life Extension Mix Tablets with Extra NiacinLife Extension420 mg
- Bone StrengthNOW400 mg
- Magnesium Glycinate 400 mgNature's Lab Gold400 mg
- Active Women's MultivitaminSuper Nutrition400 mg
- Oxy-Plus Colon CleanserAN American Nutriceuticals346 mg
- Bone Reinforcertnvitamins333 mg
- Max for Women Iron FreeCountry Life300 mg
- OsteoPrime Plus Calcium & MagnesiumNature's Way300 mg
- Tri-MagnesiumIntegrative Therapeutics300 mg
- Alive! Calcium Bone Support 1,200 mgNature's Way264 mg
- Calcium & Magnesium Mineral Complex 750 mgNature's Way250 mg
- Chelated Magnesium 250 mgCountry Life250 mg
- Vitalizer MenShaklee225 mg
- BalanceNutraChamps200 mg
- Testo 360Just Ripe Nutrition200 mg
- EnergizeiSatori150 mg
- Lean PMJacked Factory150 mg
- Natural ChangesNature's Sunshine150 mg
- Smoking JittersSignature Supplements150 mg
- Joint SupportNOW133 mg
- Glucose Supportdr.bo125 mg
- Blood Sugar Ultra SupportNumber One Nutrition125 mg
- Energy & MetabolismGNC Mega Men120 mg
- Sport MultivitaminGNC Mega Men120 mg
- Alive! Men's 50+ Complete MultivitaminNature's Way105 mg
- Alive! Women's Ultra MultivitaminNature's Way105 mg
- CelebrateONE 45 with Iron Tropical TwistCelebrate100 mg
- Daily 1SuperSmart100 mg
- Lean Shake Burn Chocolate FudgeGNC Total Lean100 mg
- Lean Shake Burn StrawberryGNC Total Lean100 mg
- AnxietameLogos Nutritionals100 mg
- Teen Fermented Multivitamin+Codeage95 mg
- Rapid Hydration Lemon Lime FlavorAncient Nutrition76 mg
- Amino Kick Baja BurstNutraBio60 mg
- Alive! Men's 50+ Ultra Potency Complete MultivitaminNature's Way55 mg
- Alive! Men's Ultra MultivitaminNature's Way55 mg
- Glucofort MaxJustified Laboratories50 mg
- Multi-ADEKCelebrate50 mg
- Mutli-ADEKCelebrate50 mg
- Neuro HealthNature’s Craft50 mg
- Plant-Based MultivitaminLife Extension50 mg
- Special Two Multi VitaminBaar Nature's Blessing50 mg
- Sweet Relief Glycogen Support ExtremeJustified Laboratories50 mg
- Vitality Calcium CompleteVitality For Life50 mg
- Advanced Memory FormulaJust Ripe Nutrition50 mg
- AdrenaMed GL50NuMedica45 mg
- Dynamic Brain 300 mgStonehenge Health42 mg
- Sight CareJust Ripe Nutrition40 mg
- Women's Golden MultivitaminSolaray40 mg
- Buffered Vitamin C 500 mgSolaray37 mg
- Calcium PLUS 500 Mixed FruitCelebrate34 mg
- Hoodiadrene 1825 mgNewtonEverett10 mg
- Mag Oxy Colon CleanzSignature Supplements1,400 mg (possible slip)
Source: NIH ODS Dietary Supplement Label Database version 9.4.0; the form each label names for its row. Daily Values: the FDA's Daily Value page.
Which brands make them?
Nature's Way (148), ProCaps Laboratories (79), Bronson (74), Douglas Laboratories (68), Country Life (68), Emergen-C (53), NOW (52), Nuun (52), Vitamin World (51), Rainbow Light (51).