Vegan

E366 is classified as vegan by the local ingredient taxonomy.

Names you may see on a label

KaliumfumaratFumarato de potasioFumarato potásicoE 366KaliumfumaraatFumarato di potassioFumarát draselnýKaliumfumaraattiKaliumfumaraattiaFumarate de potassiumPotassium fumarateFumaran potasuFumarato de potássio

How to verify it

Check that the name refers to this exact ingredient and not a similar additive with a different source.