Source dependent

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

Names you may see on a label

xarope de maltosemaltoosisiirappiSirop de maltosesyrop maltozowysciroppo di maltosioMaltosesirup

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.