A form of magnesium
Magnesium hydroxide supplements
211 magnesium products in the NIH label database list magnesium as magnesium hydroxide (1% of the 15,088 magnesium products); their median is 60 mg of magnesium per serving, against 86 mg across all magnesium products (DSLD version 9.4.0, January 2026).
How does magnesium hydroxide 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
- 211166 on the market
- Median magnesium per serving
- 60 mgall magnesium products: 86 mg
- Share of magnesium products
- 1%211 of 15,088
Is the amount the magnesium or the whole magnesium hydroxide?
A Supplement Facts row normally states the magnesium itself (a row like "Magnesium (as magnesium hydroxide)"); a row named as the compound (a row like "Magnesium hydroxide") 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 211 products here, 210 give the magnesium in its own row; 1 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, 31 of the 210 magnesium hydroxide products with a plausible amount (14.8%) 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 | 70% | 50 mg | 115 mg |
| Vitamin C | 64% | 500 mg | 100 mg |
| Zinc | 58% | 2 mg | 11 mg |
| Vitamin B12 | 52% | 25 mcg | 36 mcg |
| Folate | 52% | 12.5 mcg | 400 mcg |
| Niacin | 52% | 5 mg | 20 mg |
| Vitamin B6 | 52% | 10 mg | 6 mg |
| Pantothenic Acid (Vitamin B5) | 50% | 2.5 mg | 12 mg |
| Manganese | 49% | 0.5 mg | 2 mg |
| Riboflavin | 49% | 0.43 mg | 4 mg |
Which products are they?
60 of the 211 (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.
- Detox Activation Cleansing FormulaNature's Way903 mg
- Capsule PacketNature's Sunshine600 mg
- Magnesium ComplexAbsolute Nutrition500 mg
- Marine Based Magnesium 500 mgNature's Answer500 mg
- Magnesium HydroxideBulkSupplements.com410 mg
- Gentle MoveNature's Sunshine400 mg
- Oxy-Plus Colon CleanserAN American Nutriceuticals346 mg
- The Original Oxy-CleanseEarth's Bounty346 mg
- Magnesium 300 mgNatureWise300 mg
- Chewable Nutri-Cal HeartsNaturesPlus250 mg
- Vital Cleanse - Part 2Brenda Watson's Vital Planet230 mg
- EZ-GoDoctor's Choice Naturally230 mg
- Vital LaxBrenda Watson's Vital Planet230 mg
- Bonesyl +BioPerineApproved Science200 mg
- Bone StrengthPremium Certified200 mg
- SST Support Lean SleepPerformix200 mg
- Calcium-MagnesiumCardiovascular Research180 mg
- Magnesium + AshwagandhaIrwin Naturals150 mg
- Magnesium Malate ForteAllergy Research Group124 mg
- Centrum EnergyCentrum105 mg
- Centrum Energy & VitalityCentrum105 mg
- Centrum Movement & StrengthCentrum105 mg
- BeWell Daily Multivitamin & MineralArbonne100 mg
- ATP EnergyProgressive Professional from Progressive Laboratories100 mg
- Probiotic+Kombucha+SleepZenwise +100 mg
- Vegan Joint SupportZenwise100 mg
- Prenatalcare/of100 mg
- Relaxationcare/of100 mg
- Mulitivitamin for Mencare/of90 mg
- Rapid Hydration Lemon Lime FlavorAncient Nutrition76 mg
- Total Balance Women's PremiumXtendlife67 mg
- Total Balance Men's PremiumXtendlife67 mg
- Total Balance Unisex PremiumXtendlife66 mg
- Multi-XtraXtendlife65 mg
- Total Balance Men'sXtendlife65 mg
- Total Balance Women'sXtendlife65 mg
- All Day Immune Support Ester-C Effervescent 1000 mg + Electrolytes Natural Orange FlavorPuritan's Pride60 mg
- ImmuBlast C Raspberry Burst Flavor21st Century60 mg
- ImmuBlast C Ultimate Orange Flavor21st Century60 mg
- Immune+ RaspberryEmergen-C53 mg
- 1,000 mg Vitamin C Super OrangeEmergen-C53 mg
- 1,000 mg Vitamin C Acai BerryEmergen-C53 mg
- Triple Action Testosterone Max-PerformanceApplied Nutrition50 mg
- Centrum Men's MultiCentrum50 mg
- Centrum Stress & MoodCentrum50 mg
- Centrum SleepCentrum42 mg
- Centrum Women's MultiCentrum42 mg
- Buffered C 1,000 mg Plus MineralsWoodstock Vitamins40 mg
- Total Balance Children'sXtendlife33 mg
- Liposomal Magnesium ATPCardiovascular Research30 mg
- XFactor +Plexus25 mg
- Daily-Multi Testosterone UpIrwin Naturals10 mg
- Women's FormulaSmartyPants8.4 mg
- Men's 50+ FormulaSmartyPants8.4 mg
- Prenatal FormulaSmartyPants8.4 mg
- Men's FormulaSmartyPants8.4 mg
- Women's 50+ MultiSmartyPants8.4 mg
- Men's MultiSmartyPants8.4 mg
- Men's 50+ MultiSmartyPants8.4 mg
- Colloidal Multi Mins Liquid Natural Orange FlavorGenestra Brands3 mg
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?
Emergen-C (53), Renew Life (14), American Health (11), Xtendlife (9), Centrum (7), SmartyPants (7), Nature's Answer (6), New Sun (3), BPI (3), Plexus (3).