It isn’t always easy to know exactly what is in the food you are eating.
Vegans avoid foods that contain meat and animal byproducts, like dairy and eggs (viaHealthline).
While some ingredients are usually easy to identify by reading the package, many are not.

As a vegan, you may have never checked a product for lactic acid but you should.
It’s a careful method to ensure that your vegan diet isn’t compromised.
One such ingredient for vegans to look out for is lactic acid.

Lactic acid is typically made from bacteria such as lactococcus, lactobacillus, enterococcus, streptococcus, and bifidobacterium.
While the majority of lactic acid is plant-based, there are certain times when it contains animal origins.
It’s also found in soy sauce, miso, beer, wine, and salad dressings.

When lactic acid is chemically produced in laboratories, it may contain some animal derivatives.
In those cases, there may be no real way to know if lactic acid has vegan origins.
The only way you might find out is to call the company directly and inquire about their process.