Magnesium Forms Explained
Standing in front of a shelf of glycinate, citrate and oxide can be confusing. This guide explains what each magnesium form means, how much adults need, the EU limit for supplements, and how to read elemental magnesium on a label before you choose.
What magnesium is
Magnesium is an essential mineral: the body cannot make it, so it has to come from food, drinks or supplements. An adult body holds roughly 25 g of magnesium, and more than half of it is stored in the bones. The rest sits mainly in muscles and soft tissues, where it works as a helper for a very large number of enzyme reactions.
In the EU, a short list of magnesium health claims is authorised. They cover areas such as energy-yielding metabolism, muscle function, the nervous system, electrolyte balance and the maintenance of bones and teeth. You will find the exact wording in the authorised claims box below this guide; we do not stretch those statements into anything stronger.
Forms you'll see on labels
Magnesium in a supplement is always bound to another compound. That partner changes how much magnesium is in each gram, how the product feels in the stomach and what format it comes in.
| Form | What to know |
|---|---|
| Magnesium citrate | Very common in tablets, powders and gummies. In larger amounts it can loosen the stools. |
| Magnesium glycinate (bisglycinate) | Magnesium bound to the amino acid glycine. Often chosen by people who find other forms hard on the stomach, although direct comparisons between forms are limited. |
| Magnesium oxide | Carries a high share of magnesium by weight, so tablets can be smaller. A frequent ingredient in laxative and antacid products. |
| Magnesium malate | Magnesium bound to malic acid; often found in blends with citrate and glycinate. |
| Magnesium chloride and lactate | Used in some tablets, drinks and electrolyte mixes. |
| Combination or "triple" complexes | Mix two or three forms. Check that the label states the total elemental magnesium. |
Examples from our shelves for some of the forms in the table above.
You can compare forms side by side in our magnesium collection.
How much magnesium?
- NRV (EU label reference): 375 mg a day. A product that gives at least 15% of this (about 56 mg) per daily portion may use the authorised claims.
- EFSA adequate intake: 350 mg a day for men and 300 mg a day for women, from all sources.
- Upper limit: EFSA sets 250 mg a day for magnesium from supplements and added forms. This limit does not include magnesium that is naturally present in food. Above it, the main concern is loose stools.
- Typical supplements: 100 to 300 mg of elemental magnesium per serving. Some servings are above the 250 mg EFSA level, so follow the label and ask a pharmacist if you are unsure.
Good food sources include pumpkin and sunflower seeds, almonds, cashews, spinach and other leafy greens, beans, lentils, whole grains, dark chocolate and some mineral waters.
Who should check with a doctor or pharmacist first
- People with kidney problems: the kidneys clear extra magnesium, so supplements should only be used with medical advice.
- Bisphosphonates (bone medicines such as alendronate): take at least 2 hours apart from magnesium.
- Tetracycline and quinolone antibiotics: magnesium can bind to them. Your pharmacist will tell you how many hours to separate them.
- Diuretics and proton pump inhibitors (long-term stomach acid medicines) can change magnesium levels in the body; let your doctor guide you.
- Pregnancy and breastfeeding: needs are similar to other adults, but check any supplement with your midwife or doctor.
- Children: check the age range on the pack and ask a doctor or pharmacist before giving an adult product.
- Laxatives and antacids: many contain magnesium, which adds to what you take from supplements.
How to read a magnesium label
- Find the elemental figure. "Magnesium 200 mg" means the mineral itself. "Magnesium citrate 1,000 mg" is the weight of the whole compound, which contains far less magnesium.
- Check the serving size. Many gummies list the amount for two gummies, not one.
- Look at %NRV. 300 mg equals 80% of the 375 mg NRV.
- Add up sources. Multivitamins, electrolyte powders and sports formulas may also contain magnesium.
- Count servings per pack to see how long a pack lasts.
Bahrain & GCC notes
Summer heat can soften gummies and capsules, so store packs below 25°C, away from a hot car or a sunny window. During Ramadan, most people take magnesium with suhoor or iftar alongside a meal, which also tends to be easier on the stomach. Sweat contains small amounts of magnesium; an electrolyte drink is a separate product from a magnesium supplement, so read both labels. Browse the full magnesium range to compare amounts per serving.
Reading a real label
ORZAX Magnesium Triple Complex 200 mg, 60 Tablets| On the label | What it means |
|---|---|
| 200 mg magnesium per tablet | The elemental figure, which is the one that counts |
| 53% NRV | 200 mg against the 375 mg reference intake |
| Malate, citrate and glycinate | Three forms in one tablet |
| Below 250 mg | Within EFSA's level for magnesium from supplements |
| 60 tablets, 1 a day | A 60-day supply |
- Magnesium contributes to a reduction of tiredness and fatigue
- Magnesium contributes to normal muscle function
- Magnesium contributes to normal functioning of the nervous system
- Magnesium contributes to normal energy-yielding metabolism
- Magnesium contributes to electrolyte balance
- Magnesium contributes to the maintenance of normal bones
Applies to products that provide at least 15% of the NRV per daily portion (a 'source of' the nutrient).
Products with Magnesium
Always read the label and check the amount per serving.
Known NutritionKnown Nutrition High Strength Magnesium Vegan 2-Pack 300 mg, 60 GummiesBHD19.900
Known NutritionKnown Nutrition High Strength Magnesium Vegan 300 mg, 60 GummiesBHD15.900
KindnatureKindnature 2-in-1 Magnesium Glycinate + Citrate, 2 x 60 GummiesBHD18.000
Known NutritionKnown Nutrition Essentials Bundle: Magnesium and Vitamin DBHD16.900
KindnatureKindnature 2-in-1 Magnesium Glycinate + Citrate, 60 GummiesBHD10.790
ORZAXORZAX Magnesium Triple Complex 200 mg, 60 TabletsBHD9.900Frequently asked questions
Which form of magnesium should I choose?
There is no single right form. Citrate and glycinate are common and well studied; oxide packs more magnesium into a smaller tablet but is more likely to loosen the stools. Compare the elemental magnesium per serving.
Can I take magnesium every day?
Many adults do, within the label directions. EFSA advises keeping magnesium from supplements to 250 mg a day or less, not counting food.
Is magnesium citrate 1,000 mg the same as 1,000 mg of magnesium?
No. That figure is the weight of the whole compound. Look for the elemental magnesium line, which is much lower.
When is a good time to take magnesium?
Any regular time that suits you. Taking it with a meal can be easier on the stomach, and in Ramadan suhoor or iftar works well.
Can I take magnesium with my medicines?
Some medicines, such as certain antibiotics and bisphosphonates, need to be spaced apart from magnesium. Ask your pharmacist before you start.
