Source dependent

The source or production method of dehydrated wheat sourdough can vary, so it is not always vegan.

Names you may see on a label

pasta madre di grano essiccatasuszony zakwas pszennylevain de blé déshydratékuivattu vehnätaikinanjuurigedroogde tarwezuurdesemmasa madre deshidratada de trigosuchy zakwas pszennydried wheat sourdough

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.