Vegan

E252 is classified as vegan by the local ingredient taxonomy.

Names you may see on a label

KaliumnitratKNO3E 252KalisalpeterKaliumnitraatKno3Dusičnan draselnýSalnytrSanitrLedek draselnýSalnitrDraselný ledekSanytrNitrate de potassiumSalpêtreNitreNitrate de potasse7757-79-1Nitrate et de potassium질산 칼륨Azotan potasuAzotanV potasuNitrato potásiconitrato de potasioSal nitroConservante E-252Nitrato de potasaConservante E252KaliumsalpeterSalpeter

How to verify it

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