Tartaric Acid (Wine Processing) — Hidden Processing Agent — Is It Vegan?

Vegan status: Vegan

Also known as: L-tartaric acid, E334, Cream of tartar precursor

Source

Extracted from grape pomace (the solid waste from wine production), primarily from byproduct of Italian and Spanish wine industries. Entirely plant-derived from grapes.

Used in

Wine acidification (correcting low-acid musts), cream of tartar production (potassium hydrogen tartrate), baking powder, some food acidulants.

Appears on label: No. E334 when used as a direct ingredient. In winemaking, it is a processing addition that may not appear on the label.

How to avoid

No need to avoid — tartaric acid is vegan.

Notes

Tartaric acid is unique among food-grade acids in being commercially derived almost exclusively from grape pomace — a genuine circular economy story from the wine industry. Cream of tartar is potassium hydrogen tartrate, a naturally occurring byproduct that crystallises on the inside of wine barrels and casks.