Magnesium for migraine: which form actually works?

“I already take magnesium, but I don’t notice any difference.” I hear that a lot in my practice. The reason often turns out to be the same: the wrong form. Because magnesium is not just magnesium. The difference between a supplement that works and one that does next to nothing lies entirely in what that magnesium is bound to: the form. On top of that, magnesium, even a good form, is only a drop in the ocean if a lot is still structurally going wrong.

In this article I explain why magnesium matters so much in migraine, why the best-selling forms barely work, and which forms you do want to use.

Why magnesium matters so much in migraine

A magnesium deficiency has been shown in up to 50% of people with migraine [1, 2]. That is no coincidence. Magnesium is involved in more than 300 processes in your body, but in migraine a few of them really stand out:

• It keeps your nerve cells calm. Your brain has a substance called glutamate. It makes nerve cells active, which is useful, but in migraine they become too active. Magnesium works as a kind of brake on that process: it blocks the spot where glutamate normally binds (the so-called NMDA receptor), so your nerve cells don’t run away with themselves so quickly [3, 4]. Too little magnesium? Then that brake falls away and your brain becomes more excitable.
• It supports your energy production. Every cell in your body has tiny energy factories: the mitochondria. They make ATP, the fuel your body runs on. Magnesium is needed for that process to run properly [5]. In many people with migraine, those energy factories already work less well, and a magnesium deficiency makes that even worse.
• It relaxes your blood vessels. In migraine, blood vessels first constrict (spasm) and then, in response, open up too much. Magnesium helps keep those blood vessels supple, so the swings are less intense [6].
• It inhibits migraine aura. Aura is caused by a wave of activity that travels across your cerebral cortex (in science this is called cortical spreading depression). Magnesium helps slow that wave, again by blocking the NMDA receptor [4, 7].

The problem with testing: serum magnesium says little

Only 1% of the magnesium in your body is in your blood. The rest is in your bones, muscles and tissues [8, 9]. A standard blood test measures only that one percent, so it can come back perfectly normal while your cells are seriously short.

This explains why many doctors say your magnesium is “fine”, while your body really does have too little of it. A more reliable measurement is magnesium in your red blood cells (erythrocyte magnesium), but it is rarely ordered [2, 9].

Important: magnesium alone is rarely the whole story. It works best as part of a broader approach: nutrition, sleep, stress regulation, hormonal balance… all need to be right too. But if your magnesium status is not in order, it undermines everything else.

Not all magnesium is equal: the forms compared

This is where it goes wrong for most people. They buy magnesium at the supermarket or pharmacy and get a form that is barely absorbed. These are the main forms and what they do for you:

Magnesium oxide: avoid

By far the best-selling form, but also the worst choice. Its bioavailability is only 4% [10]. That means that of a 400 mg tablet of magnesium oxide, only 16 mg is actually absorbed. The rest draws water into the gut and causes diarrhoea. Handy as a laxative, but useless if you want to improve your magnesium status.

Magnesium bisglycinate (glycinate): the best all-rounder

Here the magnesium is bound to glycine, an amino acid. This form is well absorbed, causes the fewest gut complaints, and you get a bonus: glycine itself also has a calming effect on your nervous system [12, 13]. So you get a double benefit: the magnesium and the glycine both help calm your brain. That makes this the best first choice for most people with migraine.

Magnesium taurate: calming for the nervous system

Here the magnesium is bound to taurine. Taurine is a substance your body also makes itself, and it helps strengthen the braking function in your brain: it supports GABA, the messenger substance that calms your nerve cells [14]. Useful in migraine, because over-excitability is exactly the problem. Taurate is also good for your heart and helps regulate your blood pressure [14]. A strong choice if, besides migraine, you also struggle with palpitations, stress or sleep problems.

Magnesium glycerophosphate: reaches the brain

Your brain is protected by a strict filter: the blood-brain barrier. Not everything in your blood simply gets into your brain, and that applies to many forms of magnesium too. Glycerophosphate has high bioavailability, and the glycerol component supplies building blocks for the phospholipids in your brain cell membranes and for energy production in nerve cells [15]. That makes it an interesting choice if you want to support your brain specifically, for example with aura, sensitivity to light or other neurological symptoms.

Magnesium citrate: for the muscles

Much better absorption than oxide (around 25-30%) and readily available [10, 11]. Magnesium citrate helps muscles relax and can be useful for neck tension, jaw clenching and muscle tension in the shoulders, complaints that many people with migraine have. Downside: at higher doses it can speed up your bowel movements. Not the best choice if you have a sensitive gut, but actually a good option if you tend to get constipated.

Magnesium malate: for muscles and energy

Here the magnesium is bound to malic acid (malate). Malic acid plays a role in the citric acid cycle, the process your cells use to make energy [16]. Like citrate, malate works well for the muscles, but with an extra benefit: it supports energy production in your mitochondria. Interesting if muscle pain and fatigue are prominent complaints alongside your migraine. Well tolerated.

Dosage and timing

The recommended dose for migraine prevention is 400-600 mg of elemental magnesium per day [1, 2]. Note: this is the amount of magnesium itself, not the total weight of the capsule. The label may list this as “elemental magnesium”. Often this information is missing.

• Split the dose over 2-3 moments a day (better absorption)
• A larger dose of bisglycinate in the evening can improve sleep quality

When your body is saturated with magnesium, you get a laxative effect: you simply lose the excess through your bowel movements. If you notice this, your dose is slightly too high. Your need for magnesium can vary from day to day, depending on how demanding your day is.

What does the research say?

The evidence for magnesium in migraine is strong enough to place it at evidence level B, which means there is enough clinical evidence to recommend it as a preventive treatment [17, 18]. The American Academy of Neurology names it explicitly in its guidelines [18].

• Mauskop & Varughese (2012) concluded that all people with migraine should receive magnesium, given its low cost, good safety and the widespread deficiency [1].
• Intravenous magnesium has proven effective for acute migraine attacks, especially migraine with aura [19].
• Oral magnesium (600 mg/day) significantly reduced migraine frequency after 12 weeks in a randomised, double-blind, placebo-controlled study [20].

Magnesium from food

Supplements are important if you are deficient, but don’t forget food sources:

• Pumpkin seeds: 150 mg per 30 grams
• Dark chocolate (85%+): 65 mg per 30 grams
• Spinach: 78 mg per 100 grams (cooked)
• Almonds: 80 mg per 30 grams
• Avocado: 58 mg per avocado

The problem is that modern farmland contains fewer and fewer minerals, so even a varied diet often does not provide enough magnesium [21]. That is why supplementing is almost always necessary for people with migraine.

In summary

Magnesium is one of the safest and best-supported supplements for migraine. The key is the right form: bisglycinate as a base, glycerophosphate for the brain, taurate for overstimulation, and citrate or malate for the muscles. And don’t be misled by a “normal” blood test: it says almost nothing about your actual magnesium status.

But don’t expect magnesium alone to solve everything. If your nutrition, sleep, hormones and other building blocks are not in order, magnesium won’t make the difference. Do you have that foundation right? Then the right form of magnesium can really make a big difference: it is often the missing piece of the puzzle.

Want to know which supplements make the most sense in your specific situation? The Building Block Analysis maps out your building blocks so you can get started in a targeted way.

References

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2. Assarzadegan F, et al. Serum concentration of magnesium as an independent risk factor in migraine attacks: a matched case-control study and review of the literature. International Clinical Psychopharmacology. 2016;31(5):287-292.
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19. Bigal ME, et al. Intravenous magnesium sulphate in the acute treatment of migraine without aura and migraine with aura. Cephalalgia. 2002;22(5):345-353.
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