Supplementen, getoetst aan het bewijs

Magnesium

Sterkte van het bewijs: Zwak

Bijgewerkt 2026-08-07

Deze gids is nog niet in uw taal vertaald en wordt daarom in het Engels getoond.

Kort antwoord

Does magnesium help insulin resistance?

Modestly, and mostly if you are short of it. Pooled trial data show magnesium lowering fasting glucose in people with diabetes and improving two-hour glucose tolerance in people at high risk. The effect on insulin resistance itself did not reach statistical significance, and trials shorter than about four months tend to show nothing.

Voordat u dit neemt

Overleg met uw voorschrijver voordat u dit bij een medicijn neemt, zeker bij bloedsuikerverlagende middelen. Stop nooit met een voorgeschreven medicijn om een supplement te nemen.

Interacties

  • Mildly additive with glucose-lowering medication. The effect is small — smaller than berberine's — but it is real enough to have shown up in pooled trials, so it belongs on the list rather than being rounded to nothing.1

    Voorzichtig

  • Reduces absorption of tetracycline and quinolone antibiotics, and of bisphosphonates. Separate the doses by several hours rather than stopping either.

    Voorzichtig

  • Proton pump inhibitors taken long-term lower magnesium, and some diuretics increase its loss. If you take either, magnesium status is worth measuring rather than guessing at.

    Voorzichtig

Wie het niet moet nemen

  • Avoid supplementing without medical supervision if you have impaired kidney function. The kidneys clear magnesium, and when they cannot, it accumulates to dangerous levels.

    Vermijden

  • Loose stools are the usual dose-limiting effect, and they arrive well before any metabolic benefit would. Oxide is the worst offender; citrate and glycinate are better tolerated.

    Voorzichtig

Ons oordeel

A reasonable thing to correct if you are deficient, and a poor bet as a glucose intervention on its own. Cheap enough that the downside is small — but "cheap and harmless" is not the same as "works".

Wat wij bij u mogen zeggen en verkopen

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Hoe u de bewijslabels leest

Elke bewering op deze pagina draagt een label dat aangeeft hoeveel gewicht zij kan dragen. Het beschrijft de sterkte van de bevinding, niet het aanzien van het tijdschrift.

  • Sterk bewijsEen grote gerandomiseerde studie, een lang cohortonderzoek, of overeenstemming tussen meerdere daarvan.
  • Voorlopig bewijsEcht, maar dun — klein, kort, observationeel of nog niet gerepliceerd.
  • OmstredenDeskundige onderzoekers zijn het openlijk oneens. Wij kiezen geen kant voor u.

What the pooled trials show

A meta-analysis of eighteen double-blind randomised trials split the question by population. In people who already had diabetes, magnesium lowered fasting glucose. In people at high risk but not yet diabetic, it improved glucose two hours into an oral glucose tolerance test.

The measure most people actually care about — insulin resistance, as HOMA-IR — moved in the right direction but not significantly, and the trials disagreed with each other substantially.

Wat het bewijs zegt

  • Across 18 double-blind randomised trials, magnesium supplementation reduced fasting plasma glucose in people with diabetes.1

    Voorlopig bewijs

  • In people at high risk of diabetes, magnesium improved two-hour glucose after an oral glucose tolerance test.1

    Voorlopig bewijs

  • The effect on insulin resistance measured by HOMA-IR was a non-significant trend, with the confidence interval crossing zero and high inconsistency between trials.1

    Voorlopig bewijs

Why the timescale matters

Magnesium is not a supplement whose effect you will watch appear on a sensor over a fortnight. Where benefits show up in trials, they tend to require months of supplementation, which is longer than most people persist and far longer than the wear of a single CGM sensor.

If you are wearing a sensor to see whether magnesium is doing something, you will almost certainly conclude it is not — regardless of whether it eventually would.

What the label can and cannot say

Magnesium is a nutrient rather than a botanical, so unlike most of this page it holds authorised claims in the EU — for contributing to normal energy-yielding metabolism, muscle function and psychological function, among others.

None of those authorised claims is about glucose control or insulin sensitivity. A product marketed to you for blood sugar is using the general permission to imply a specific effect the regulator has not approved.

Veelgestelde vragen

Which form of magnesium is best?
For tolerability, citrate or glycinate over oxide, which is poorly absorbed and most likely to cause loose stools. No form has been shown superior for glucose outcomes specifically.
Should I take magnesium if my levels are normal?
The trials that show benefit are mostly in people with diabetes or at high risk, and the mechanism is plausibly repletion. If you are not short of it, expect less.
How long before I would see anything?
Months rather than weeks in the trial data. A two-week sensor wear is the wrong instrument for answering this question.

Literatuur

  1. 1.Veronese N, Watutantrige-Fernando S, Luchini C, Solmi M, Sartore G, Sergi G, et al. (2016). Effect of magnesium supplementation on glucose metabolism in people with or at risk of diabetes: a systematic review and meta-analysis of double-blind randomized controlled trials. European Journal of Clinical Nutrition. 10.1038/ejcn.2016.154

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