Does Magnesium Supplementation Actually Help with ADHD?

Magnesium is one of the most incredible nutrients we can eat. It is involved in many biological processes—even ones in the brain like helping make dopamine. If you missed the breakdown on how magnesium affects ADHD, start here.

So the next question is obvious: Should you take a magnesium supplement if you have ADHD?

Let’s walk through what the research actually says—and where the gaps are—so you can make an informed choice for your brain (and your budget).

What we do and don’t know

Here’s the uncomfortable truth: There is a significant lack of research on magnesium supplementation for ADHD, let alone high-quality placebo-controlled trials. 

That means:

• No evidence confirming benefits in people with ADHD 
• No clear dosage, form, or timing protocol

But that doesn’t mean the research is empty. Here’s what we have:

1. L-Threonic Acid Magnesium Salt

This study looked at 15 adults with moderate ADHD. A magnesium threonate supplement (LTAMS) taken for up to 12 weeks significantly improved attention, cognitive flexibility, and ADHD symptom severity. 47% of participants showed a clinical response (no placebo).

2. Unspecified Magnesium

This study looked at 18 children with ADHD and low hair magnesium. Half (9) received 200 mg/day of oral magnesium for 8 weeks while the others had care as usual. Those given magnesium improved parent-rated ADHD severity (no placebo). 

This study looked at 50 children with ADHD and confirmed magnesium deficiency. They took about 200 mg of magnesium daily for 6 months. Compared to 25 children who didn’t get magnesium, the supplemented group showed a significant decrease in hyperactivity (no placebo).

3. Magnesium + B6 supplement

This study looked at 52 children with hyperactivity (not diagnosed ADHD). A magnesium + B6 supplement (100 mg/day) statistically reduced physical aggressivity, instability, scholar attention, hypertony, spasm, and myoclony (no placebo).

4. Magnesium + D supplement

This study looked at 66 children with ADHD. A vitamin D + magnesium supplement (50,000 IU/week and 6 mg/kg/day) statistically reduced conduct problems, social problems, and anxiety/shyness after 8 weeks compared to placebo. 

Skip the trial and error. My ADHD Supplement Guide breaks down exactly what works—backed by the most current research, not hype.

👉 Get the guide and take the guesswork out of ADHD supplements.

Before you supplement magnesium for ADHD

Before you grab a bottle of magnesium capsules from your local pharmacy shelf, here’s what you should keep in mind:

Talk to Your Healthcare Provider First

Magnesium supplementation isn’t a one-size-fits-all fix. It’s important to check with your doctor or dietitian — especially if you:

• Take medications (magnesium can interact with certain drugs)
• Have kidney issues or other medical conditions
• Want to confirm if you have a magnesium deficiency

A simple blood test often doesn’t catch magnesium deficiency well, so your provider might consider other markers or symptoms.

The Risks of Magnesium Supplementation

Magnesium supplements are generally safe but can cause side effects like:

Different Types of Magnesium

Not all magnesium supplements are created equal. Some forms are better absorbed and more likely to affect brain function:

Choosing the right type depends on your goals, tolerance, and advice from your healthcare provider.

Remember: Magnesium Is Just One Part of ADHD Support

Magnesium supplementation, when appropriate, might help ease symptoms for some—especially those deficient. But it’s not a standalone treatment, nor does it have much clinical backing. To get the benefits of magnesium without the side effects of supplementation, read up on the 5 Ways to Improve Magnesium Without Supplements.

And if you’re looking for more clarity on what supplements do have real backing for ADHD, grab the full ADHD Supplement Guide here. Your brain deserves science, not hype.

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