Magnesium for migraine: the best-evidenced mineral, and why form matters
Magnesium for migraines: the mineral with the strongest evidence, and the form that works
Time to effect
Dose
Active compound
▪ The challenge at hand
If you get migraines, especially menstrual migraines or migraine with aura, you've probably been offered prescription prevention before anyone mentioned magnesium, even though it holds the strongest guideline rating of any supplement for the job. Migraine sufferers are also disproportionately magnesium-deficient, which makes the omission more striking.
As with magnesium for sleep, the form is the unspoken decision that determines whether it works. Oxide, the cheapest and most common form, is poorly absorbed and is exactly what most people try and abandon. Glycinate or citrate absorb far better. The other non-obvious detail: aura sufferers specifically tend to respond, and menstrual-migraine sufferers can time dosing to the two weeks before their period.
▪ What it is
Magnesium is an essential mineral used here specifically for migraine prevention, taken daily in a well-absorbed form (glycinate or citrate) rather than the common oxide.
▪ Why this is surprising
Magnesium holds the highest evidence grade (AAN/AHS Level B, 'probably effective') of any nutraceutical for migraine prevention, yet is rarely offered before prescription options. As in the sleep entries, form is the unspoken clinical decision, oxide (cheapest, most common) is poorly absorbed and is what most people try and give up on. Migraineurs are disproportionately magnesium-deficient, and aura sufferers specifically tend to respond.
▪ How it works
Raising the migraine threshold.
Magnesium is a natural NMDA-receptor antagonist; deficiency increases cortical excitability and predisposes to cortical spreading depression, the substrate of aura. It also stabilizes vascular tone and modulates serotonin and substance-P signaling. Restoring magnesium raises the threshold at which a migraine can be triggered.
▪ The research
What the evidence says
The American Academy of Neurology and American Headache Society evidence-based guideline rates magnesium as Level B, probably effective, for episodic migraine prevention, based on randomized controlled trial evidence. That places it among the best-supported nutraceuticals for this use, in the established tier, with the clearest response in aura and menstrual-migraine patterns.
Holland S et al. Neurology. 2012;78(17):1346-53. PMID: 22529203. (AAN/AHS Level B rating.)
started
completed
noticed a change
made it routine
▪ What to look for
A practical buying guide
Choose glycinate or citrate, not oxide. Oxide is the cheapest and most common form, but it's poorly absorbed and is the usual reason magnesium 'doesn't work.' Check the elemental magnesium figure on the label rather than the total compound weight. Glycinate is gentlest on the gut at the higher doses used here.
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▪ What to expect over time
Like the other migraine-prevention nutraceuticals, magnesium needs about three months of consistent use before its full preventive effect can be judged.
Side effects
Loose stools at higher doses, least with glycinate. Mild blood-pressure lowering. Always consult a care provider when considering adding or removing any supplement to your routine.
Who should be cautious
Significant renal impairment, since magnesium is cleared by the kidneys. Myasthenia gravis. Separate from tetracycline and quinolone antibiotics by about 2 hours.
FAQ
I tried magnesium and it didn't help. Why?
Can I time it to my cycle?
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Educational only. This is not medical advice. Always talk with a qualified clinician before changing medications, supplements, or care plans.