Source dependent

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

Names you may see on a label

L bulgaricuslactobacilus delbrueckii sp BulgaricusL. bulgaricusLactobacillus delbrueckii subsp. bulgaricusL. delbrueckii subsp. bulgaricusbulgaricusLactobacillus delbrueckii subspecies bulgaricus

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.