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Limited evidencePhysical performance

Malic Acid

A Krebs cycle intermediate found in apples, used for fibromyalgia pain and as the malate half of citrulline malate. The fibromyalgia evidence is one small pilot trial, and malate's own contribution to citrulline malate has never been isolated.

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What the science says

  • Fibromyalgia pain Limited evidence

    A randomized double-blind placebo-controlled crossover pilot study of magnesium plus malic acid found no significant benefit in the blinded phase; improvements appeared only in the open-label, higher-dose extension. A later evidence summary concluded the certainty is very low.

  • Exercise performance as citrulline malate Limited evidence

    A critical review of citrulline malate supplementation notes that malate is usually given at a fixed ratio with citrulline and that no trial has separated the effects of the two. Any performance benefit cannot be attributed to malic acid itself.

  • Energy metabolism Limited evidence

    The rationale that supplemental malate boosts ATP production through the Krebs cycle is theoretical. No human trial has demonstrated increased energy output from malic acid alone.

Dosage & safety

Studied doseThe fibromyalgia trial used 200–600 mg/day of malic acid with magnesium. Citrulline malate products supply malate at roughly a 1:1 or 2:1 ratio with citrulline, typically 3–8 g total.
SafetyWell tolerated; the acid can cause mild stomach upset or worsen reflux at higher doses, and it is mildly erosive to tooth enamel in acidic drinks. Magnesium-malate combinations can cause loose stools from the magnesium.

How to take it

TimingTiming does not matter.
With food?Take it with food, since the acid can trigger reflux or stomach discomfort on an empty stomach.
Worth knowingRinse your mouth with water after acidic drinks containing it, because malic acid erodes tooth enamel with frequent use.

Interactions

With other supplements

  • magnesium, as in magnesium malate

    The loose stools people blame on malate come from the magnesium. lower the magnesium dose rather than the malate

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

Frequently asked questions

Does malic acid help fibromyalgia?

Malic acid has limited evidence for fibromyalgia: a pilot trial of magnesium plus malic acid found no significant benefit in its blinded phase, with improvements only in the open-label extension. A later evidence summary rated the certainty very low.

Does malic acid boost energy?

The idea that malic acid boosts ATP production through the Krebs cycle is theoretical, and no human trial has shown increased energy output from malic acid alone. In citrulline malate, malic acid's own contribution has never been isolated.

How much malic acid should I take?

The fibromyalgia trial used 200–600 mg/day of malic acid with magnesium. Citrulline malate products supply malate at roughly a 1:1 or 2:1 ratio with citrulline.

Does malic acid have side effects?

Malic acid can cause mild stomach upset or reflux at higher doses, so take it with food, and it erodes tooth enamel in acidic drinks. Loose stools from magnesium malate come from the magnesium, not the malic acid.

Scientific references

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