Malic Acid
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An organic acid naturally found in apples and many other fruits, and produced synthetically for use as a food and supplement ingredient. It has a tart, sour taste.
Why it’s used
Used in supplements mainly as a flavoring or pH-adjusting agent, and included in some products aimed at exercise performance or muscle comfort, often paired with magnesium as magnesium malate, on the theory that it plays a role in cellular energy production.
What the evidence says
As a food additive, malic acid has a long history of use and is generally recognized as safe by regulatory bodies for its use in food. As a standalone supplement taken for energy or muscle-related effects, direct clinical evidence is sparse; most human research involves malic acid combined with other compounds (such as magnesium or in the context of fibromyalgia studies from decades ago), which does not isolate malic acid's own contribution.
Context
Older, small studies pairing malic acid with magnesium for fatigue-related complaints exist but are limited in size and design, and do not establish an effect for malic acid alone.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.