Yes, lactic acid is vegan, despite the name
Despite the name, it's made by fermenting plant sugars, not from milk.
The full answer
Lactic acid was first found in sour milk, which is where its name comes from. That's why so many vegans and people with a dairy allergy stop at it on a label.
The lactic acid added to food today is made by bacteria that ferment plant sugars, usually from corn, sugar beets or cane. No milk is involved, and the finished acid contains no lactose and no milk protein.
The same goes for its salts and relatives: sodium lactate, calcium lactate and sodium stearoyl lactylate all get their "lact-" from lactic acid, not from milk. (Sodium stearoyl lactylate can still be made with animal fat, so check that one separately.)
In rare cases, a maker may ferment whey or other dairy sugars. If you need certainty, for example for a severe milk allergy, look for a vegan logo or ask the brand.
What to look for on the label
- "Lactic acid" alone is almost always plant-based
- A certified vegan logo if you need a guarantee
- "Lactose" or "whey" are dairy; "lactic acid" is not
Other diets
Make cheese and pickles at home
For your pantryFood-grade lactic acid (88%)
A few drops sour fresh cheese, brines and dough.
Shop lactic acid Opens your country’s Amazon storepH test strips for food
Check that pickles and ferments are acidic enough to be safe.
Shop pH strips Opens your country’s Amazon storeBeginner cheesemaking kit
Mozzarella and ricotta in under an hour.
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Common questions
Is lactic acid safe with a milk allergy?
Yes in almost every case. It contains no milk protein, which is what causes the allergic reaction.
Is sodium lactate vegan?
Usually, yes. It's made from the same plant-fermented lactic acid.
Safety score, rules by country, health notes and swaps.