There is no single best magnesium; there is only the form that suits you best. Citrate and bisglycinate are generally well absorbed, oxide contains a lot of magnesium per gram but your body absorbs relatively little of it. Magnesium contributes to normal muscle function and to the reduction of tiredness and fatigue. Use the selection guide below to choose the right form straight away.
What does magnesium do in your body?
Magnesium is a mineral with three EFSA-approved claims that matter for athletes: it contributes to normal muscle function, to the reduction of tiredness and fatigue, and to normal protein synthesis. We promise nothing more, because nothing more has been approved. That keeps things honest and straightforward.
You get magnesium primarily through food: nuts, seeds, wholegrains, green leafy vegetables and legumes. Anyone who eats a varied diet already goes a long way. A supplement is an addition for those who fall short, for example during intensive exercise or when following a diet low in those foods. It remains a supplement to a healthy diet, not a replacement for one.
What forms of magnesium are there?
The three forms you see most often: magnesium citrate, magnesium bisglycinate and magnesium oxide. Citrate and bisglycinate are organic compounds that are well absorbed. Oxide is an inorganic form with a lot of elemental magnesium per gram, but more limited absorption. There are also forms such as taurate and malate.
On a label, what ultimately matters is not just how much magnesium is in there, but also in what form. A modest dose from a well-absorbed form can do more for your body than a higher dose from a poorly absorbed form. That is the main lesson of this entire topic: look beyond the biggest number on the front of the tub.
What is magnesium citrate?
Magnesium citrate is magnesium bound to citric acid. It is the all-rounder among the forms: well absorbed, widely available and a great first choice for most people. Anyone who simply wants a solid standard form without diving deep into the subject will almost always do well with citrate.
What is magnesium bisglycinate?
Magnesium bisglycinate is magnesium bound to the amino acid glycine. This form is also well absorbed and is known as a gentle option. Many people who are looking for a mild form, or for whom citrate does not agree well, therefore choose bisglycinate. In terms of absorption, citrate and bisglycinate are very similar.
What is magnesium oxide?
Magnesium oxide is an inorganic form that contains a lot of elemental magnesium per gram, but from which your body absorbs relatively little. Oxide is often found in simple, budget-friendly supplements. The large number on the label looks appealing; what is actually absorbed is a different story.
Does that make oxide bad? No, it is simply a form where you need to know what you are buying. Those who consciously prioritise absorption will more likely reach for citrate or bisglycinate. The trade-off really is that straightforward.
Which form suits you?
Choose based on what you are looking for: a solid standard, a gentle form, or simply the basic option. The table below puts the three forms side by side, so you do not have to wade through three tabs of contradictory advice.
| Form | Absorption | Characteristic | Suits you if |
|---|---|---|---|
| Magnesium citrate | Good | All-rounder, widely available | You simply want a solid standard form |
| Magnesium bisglycinate | Good | Known as a gentle form | You want a mild option or citrate does not agree with you |
| Magnesium oxide | Limited | High magnesium per gram, simple form | You consciously choose the simplest basic option |
If you are torn between citrate and bisglycinate, know that both are well-absorbed forms. The difference lies mainly in personal experience and preference, not in a world of difference on the label. Pick one, use it consistently for a while, and only then decide whether you want to change anything. Switching tubs every week just leads to a cluttered kitchen cupboard, not a better result. Here too: the boring, consistent choice beats the perfect one you abandon after two weeks.
How much magnesium do you need per day?
Start with your diet and use a supplement as an addition. For dosage, one simple rule applies: follow the label of your product. Taking more than stated there is neither necessary nor wise; very high doses all at once can also have a laxative effect.
Stacking therefore makes no sense. One well-chosen form at the dose stated on the label is enough; three tubs side by side do not make you three times healthier. If you take medication or have health complaints, consult your doctor first. A webshop is not a doctor, and you should not want it to be.
When should you take magnesium?
The time of day matters little; a consistent time that you stick to makes all the difference. Many people take magnesium in the evening with their meal, simply because that is a calm, fixed moment. A great habit, not an obligation.
Magnesium is often linked to sleep online. To be honest: that claim is not approved, so we do not make it. What is established is the contribution to the reduction of tiredness and fatigue. Including magnesium in your evening routine is perfectly fine; those who expect miracles from it are reading too much hype and too few labels.
Magnesium and sport: what's the story?
During intensive exercise you lose fluids and minerals through sweat, which you replenish primarily through normal food and drink. Magnesium contributes to normal muscle function, which is precisely why it features as a staple in the basics list for athletes.
How to practically organise your nutrition around training, you can read in eten voor en na het sporten. For long or hot sessions, an isotonic sports drink is a logical addition. And if you are training for something demanding like a Hyrox, also take a look at alles over supplementen bij Hyrox. Same no-nonsense approach, different starting point.
Frequently asked questions about magnesium
Which magnesium is best for your muscles?
There is no specific "muscle form". The EFSA claim – magnesium contributes to normal muscle function – applies to magnesium as a mineral, not to one specific variant. Above all, choose a well-absorbed form such as citrate or bisglycinate, and take it consistently.
Is magnesium oxide bad?
No, it is not a bad substance, but it is a form with limited absorption. Per gram, oxide contains a lot of magnesium, which makes the label look impressive. Those who primarily want it to be absorbed will more likely opt for citrate or bisglycinate. Knowing what you are buying is half the battle here.
Does magnesium help you sleep?
That claim is not approved, so we leave it alone. What is approved: magnesium contributes to the reduction of tiredness and fatigue. Including magnesium in your evening routine is perfectly fine, as long as you do not treat it as a sleeping aid.
Can you take too much magnesium?
If you stick to the label, you are on safe ground. Very high doses all at once can have a laxative effect, and taking more than the label prescribes gives you nothing extra. Unsure, or taking medication? Consult your doctor before you start.
Can I get enough magnesium from food?
Often yes. Nuts, seeds, wholegrains, green leafy vegetables and legumes all provide magnesium, and anyone eating a varied diet already covers a good portion of their needs. A supplement is there as an addition, not as a foundation. Sort the shopping list first, then the tub.
The best magnesium is therefore the form that suits you and that you take every day. No seventeen tubs, no miracle claims. One good choice and sticking with it. Healthier than that is hard to get. Do what works.