By Malvina Demaj Last Updated: Mar 6, 2026

Malic Acid

(ma-luhk a-suhd)
DEFINITION

Malic Acid

Malic acid (C₄H₆O₅) refers to a naturally occurring organic acid in wine grapes, primarily found in unripe grapes or cool climate berries. It gives wines a sharp, green apple like acidity, tartness and freshness. It is very important in crisp white wines like Sauvignon Blanc and Riesling, but winemakers convert it to softer lactic acids in red wines during the process of malolactic fermentation. Sometimes, producers add malic acid powder to boost acidity in overripe grapes.

Did you know? At its peak, you can hear the sounds of malolactic fermentation; a faint crackling sound caused by the action of the bacteria.

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