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Magnesium Malate

A perfectly reasonable, well-absorbed organic magnesium salt sold on a story — that malic acid feeds the Krebs cycle and therefore fights fatigue and fibromyalgia pain — which no blinded trial has actually supported. If you like it, take it; do not pay a premium for the energy claim.

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What the science says

  • Magnesium is bioavailable from malate, but no better than from other organic salts Limited evidence

    EFSA's 2018 opinion on magnesium citrate malate concluded magnesium is released and absorbed from the compound and is a suitable dietary source. Rat isotope work comparing ten magnesium salts found organic salts modestly better absorbed than inorganic ones overall, with no standout for malate; no human head-to-head trial has shown malate beating citrate or glycinate.

  • The fibromyalgia evidence is weaker than it is usually presented Limited evidence

    The often-cited 1995 trial gave 24 fibromyalgia patients a malic acid 200 mg + magnesium 50 mg tablet, 3 twice daily, for 4 weeks double-blind: no clear treatment effect versus placebo. Pain reductions appeared only in the subsequent 6-month open-label phase at up to 6 tablets twice daily — unblinded, uncontrolled, and never replicated in the three decades since.

  • The "malate gives you energy" mechanism is speculation Limited evidence

    Malate is a citric-acid-cycle intermediate, but supplemental malate has not been shown to raise ATP production or reduce fatigue in humans at supplement doses. Any real benefit you feel from magnesium malate is most plausibly the magnesium itself correcting a low intake.

Dosage & safety

Studied dose200-400 mg elemental magnesium per day. Elemental content varies a lot by compound: di-magnesium malate is roughly 11-15% magnesium by weight, so a 1,250 mg dose gives about 150-190 mg elemental. Studied fibromyalgia doses were 300-600 mg malic acid with 75-150 mg magnesium daily, and only in open-label conditions.
SafetySame profile as magnesium generally: loose stools and abdominal discomfort at higher doses, though malate is often better tolerated than citrate or oxide. Caution in chronic kidney disease. Separate from tetracyclines, quinolones, bisphosphonates and levothyroxine by 2 hours. No doping restrictions.

How to take it

TimingTiming does not matter; split it if you take more than 200 mg elemental.
With food?With food to reduce stomach discomfort.
Worth knowingMalate is often better tolerated than citrate or oxide, so it is a reasonable switch if magnesium normally loosens your stools.

Interactions

With medications

  • tetracycline and quinolone antibiotics

    magnesium chelates them and reduces antibiotic absorption separate by at least 2 hours

  • levothyroxine

    reduced levothyroxine absorption separate by at least 4 hours

  • bisphosphonates

    magnesium blocks their absorption separate by at least 2 hours

With other supplements

  • iron and zinc supplements

    divalent minerals compete for absorption at high doses take them at separate times of day

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does magnesium malate help fibromyalgia?

The evidence is limited. The often-cited trial of magnesium malate in 24 fibromyalgia patients found no clear effect versus placebo in its blinded phase; pain reductions appeared only in a later unblinded, uncontrolled phase that has never been replicated.

Does magnesium malate give you more energy?

No trial shows it. The idea that malate feeds the Krebs cycle and fights fatigue is speculation; any benefit you feel from magnesium malate is most plausibly the magnesium correcting a low intake.

Is magnesium malate better than magnesium citrate?

No human head-to-head trial shows magnesium malate beating citrate or glycinate for absorption. Malate is often better tolerated than citrate or oxide, so it is a reasonable switch if magnesium loosens your stools.

How much magnesium malate should I take?

Aim for 200-400 mg of elemental magnesium per day. Di-magnesium malate is roughly 11-15% magnesium by weight, so a 1,250 mg dose gives about 150-190 mg elemental.

Scientific references

Where to buy

NOW Foods, Magnesium Malate, 1,000 mg, 180 Tablets

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