The best magnesium for ADHD: why the form matters more than the brand

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Magnesium is the supplement people take for the edges of ADHD treatment — the evening stimulant comedown, the wired-but-tired sleep struggle, the muscle tension. And it's the category where most people buy the wrong product, because the form matters more than the brand.

The forms, translated

• Glycinate (bisglycinate): the calm one. Well absorbed, gentle on the stomach, and the glycine it's bound to is itself mildly relaxing. This is the form for evening use and sleep support — and the one we recommend for ADHD purposes.
• Citrate: decently absorbed but noticeably laxative. Fine if that's a feature; frustrating if it isn't.
• Oxide: the cheap one in drugstore multis — poorly absorbed, mostly a laxative. Skip it.
• L-threonate: marketed hard for "brain absorption." Interesting early research, but it's expensive and delivers little elemental magnesium per capsule. Not where to start.

Our pick

Doctor's Best High Absorption Magnesium is chelated glycinate-lysinate (the form used in absorption studies), runs about 200 mg elemental per two tablets, and costs a fraction of boutique brands. It's the workhorse pick — or browse other glycinate options if you prefer capsules to tablets.

How to use it

200–400 mg of elemental magnesium in the evening, with or after dinner. It pairs naturally with the wind-down problems stimulants cause — see our sleep guide for where it fits in the bigger picture. Start at the low end; loose stools mean back off. If you have kidney disease, magnesium supplements need a doctor's sign-off first.

Direct evidence that magnesium improves ADHD symptoms is modest — it earns its place for sleep and comedown support, not as a focus pill. The honest hierarchy is in the evidence review.