Integratori, messi alla prova delle evidenze
Magnesium
Solidità delle prove: Debole
Aggiornato 2026-08-07
Questa guida non è ancora tradotta nella tua lingua, quindi è mostrata in inglese.
Risposta breve
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.
Prima di assumerlo
Parlane con chi ti prescrive i farmaci prima di aggiungerlo a una terapia, soprattutto se ipoglicemizzante. Non sospendere un farmaco prescritto per prendere un integratore.
Interazioni
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
Cautela
Reduces absorption of tetracycline and quinolone antibiotics, and of bisphosphonates. Separate the doses by several hours rather than stopping either.
Cautela
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.
Cautela
Chi non dovrebbe assumerlo
Avoid supplementing without medical supervision if you have impaired kidney function. The kidneys clear magnesium, and when they cannot, it accumulates to dangerous levels.
Da evitare
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.
Cautela
Il nostro giudizio
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".
Che cosa possiamo dire e vendere dove sei
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Come leggere le etichette dell’evidenza
Ogni affermazione di questa pagina porta un’etichetta che indica quanto peso può reggere. Descrive la solidità del risultato, non il prestigio della rivista.
- Evidenza solidaUn grande studio randomizzato, una coorte seguita a lungo, o la concordanza di più studi.
- Evidenza preliminareReale, ma sottile — piccolo, breve, osservazionale o non ancora replicato.
- ControversoRicercatori competenti sono apertamente in disaccordo. Non scegliamo noi da che parte stare.
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.
Che cosa dicono le prove
Across 18 double-blind randomised trials, magnesium supplementation reduced fasting plasma glucose in people with diabetes.1
Evidenza preliminare
In people at high risk of diabetes, magnesium improved two-hour glucose after an oral glucose tolerance test.1
Evidenza preliminare
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
Evidenza preliminare
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.
Domande frequenti
- 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.
Bibliografia
- 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