The animal is not killed to obtain it, which is the line a vegetarian diet draws. It remains an animal product, so it sits outside a vegan diet.
The two diets, side by side
A vegetarian diet excludes animals that were killed. A vegan diet excludes animal products entirely, whether the animal survived or not. Lactic Acid sits in the gap between them: it clears the first bar and fails the second.
Lactic acid is almost always vegan. The old name 'milk acid' survives from its discovery in soured milk, but commercial E270 is fermented from corn, beet, or cane sugar, or made synthetically. The dairy route is commercially obsolete, so ask the manufacturer only if you need certainty.
What it is
- Comes from
- Can be produced from: (1) bacterial fermentation of plant sugars (corn, sugarcane, beet) [vegan], (2) synthetic chemistry [vegan], or (3) historically, from soured dairy milk [not vegan, now rare commercially]. The name 'milk acid' is misleading — the vast majority of commercial lactic acid is produced via fermentation of plant-based carbohydrates.
- Which animal
- cow, via the historic and now commercially obsolete route from soured milk
- Requires slaughter
- No, the animal keeps living
- Where you meet it
- Olives, pickles, sourdough bread, plant-based meat, vegan cheese, beer, some confectionery, pharmaceutical tablets.
- What replaces it
- Fermentation-derived lactic acid is vegan and is the commercial standard. Contact the manufacturer if certainty is required.
Editorial notes
Despite the name 'milk acid' (from its historical discovery in soured milk), modern E270 is overwhelmingly produced via fermentation of plant sugars and is vegan. The dairy-derived form is commercially obsolete. Lactic acid is a key flavor compound in sourdough, sauerkraut, kimchi, and many fermented foods. Also used in skin care as an AHA exfoliant.
Frequently asked questions
Is Lactic Acid vegetarian?
Vegetarian. The animal is not killed to obtain it, which is the line a vegetarian diet draws. It remains an animal product, so it sits outside a vegan diet.
Is Lactic Acid vegan?
Depends on Source. Lactic acid is almost always vegan. The old name 'milk acid' survives from its discovery in soured milk, but commercial E270 is fermented from corn, beet, or cane sugar, or made synthetically. The dairy route is commercially obsolete, so ask the manufacturer only if you need certainty.
Is lactic acid vegan?
In practice, yes. Commercial lactic acid is almost always produced by fermenting plant sugars or by chemical synthesis. Both routes are free of animal products. The historical dairy-based form is effectively obsolete, though contacting the manufacturer is the surest way to confirm for a specific product.
Is lactic acid made from milk?
No, not in modern production. The name 'milk acid' comes from its original discovery in soured milk, but today it is manufactured from plant carbohydrates such as corn, sugarcane, or beet, or made synthetically. The additive contains no milk and is not treated as a dairy allergen.
Is lactic acid in beer vegan?
The lactic acid itself is generally vegan, as it is either produced by fermentation or added as a plant- or synthesis-derived acidity regulator. Other aspects of a beer, such as finings used for clarification, can affect whether the beer overall is vegan. The acid alone does not determine that.