Does magnesium glycinate help with ADHD? What the research does and doesn't show

The evidence doesn't support magnesium, in any form, as a treatment for ADHD. A 2013 systematic review found only six small studies had ever tested magnesium as an intervention for ADHD, none of them a properly randomized, double-blind trial, and it concluded magnesium is not recommended for treating ADHD until better evidence exists.

What the evidence doesn't support

It doesn't support magnesium glycinate, or any other form of magnesium, as a treatment for ADHD, and no well-controlled trial exists to say what any specific dose would do. It also doesn't extend to OCD, autism spectrum conditions, or bipolar disorder: a search of the research for this page found no dedicated magnesium supplementation trial for any of those three, so there's nothing specific this page can honestly report about them.

What the trials found

The only systematic review dedicated to this question, published in 2013, searched two databases for every study on magnesium and ADHD. Out of 37 titles, just six were actual intervention studies rather than surveys or case reports. Three of those six had no control group at all. The other three were controlled, but not one was randomized and double-blind — the design needed to separate a real effect from expectation and placebo response. No study tested magnesium as the only intervention (monotherapy); it was generally combined with other treatments. The review's own conclusion was direct: "magnesium is not recommended for treating ADHD," pending stronger evidence of both effectiveness and safety.

Separate from treatment trials, a 2019 meta-analysis pooled 7 observational studies comparing blood magnesium levels between people with ADHD and healthy controls. It found people with ADHD had, on average, slightly lower serum magnesium (0.105 mmol/L lower, a small difference). But the studies varied enormously from each other — a statistical heterogeneity measure of 96%, about as high as that measure gets — which means the pooled number is unstable and shouldn't be read as a precise, settled figure. More importantly, this is a snapshot comparison of blood levels, not a trial that gave people magnesium and measured what happened to their ADHD symptoms. A correlation between a blood test and a diagnosis doesn't tell you whether raising that blood level changes anything.

Questions people ask

Is magnesium glycinate good for ADHD?

The research doesn't support that conclusion either way. The one dedicated systematic review found no well-controlled trial of magnesium for ADHD in any form, and it explicitly did not recommend magnesium as a treatment.

Is magnesium glycinate good for OCD, autism, or bipolar disorder?

We didn't find a dedicated human supplementation trial testing magnesium for any of these three conditions, so this page can't honestly say anything specific about them beyond that gap in the research.

Can low magnesium cause ADHD symptoms?

Observational studies have found people with ADHD tend to have somewhat lower blood magnesium on average, but the studies disagree with each other substantially, and an association like this doesn't establish that low magnesium causes ADHD or that correcting it would change symptoms.

When to talk to a doctor

ADHD, OCD, autism spectrum conditions, and bipolar disorder are all diagnoses that need evaluation and ongoing care from a qualified clinician. Magnesium is not a treatment for any of them, and nothing in the research above supports using it as a substitute for a diagnosis, therapy, or medication a doctor might recommend. If a child or adult is already on medication for one of these conditions, or is pregnant, talk to a doctor before adding any supplement.

Related reading: magnesium and anxiety: what the research does and doesn't show and magnesium and depression: what the research does and doesn't show.