Source dependent

The source or production method of Lactobacillus lactis can vary, so it is not always vegan.

Names you may see on a label

L. lactisLactobacillus delbrueckiiLactobacillus delbrueckii subsp. lactisL. delbrueckii subsp. lactis

How to verify it

Look for a vegan certification or a manufacturer statement identifying the original source. The ingredient name alone does not settle it.