E250: Sodium nitrite
Curing salt (preservative). Origin: Synthetic / fermentation.
Vegan
Yes, vegan
Halal
Generally halal
The honest version
The curing salt of bacon, ham and salami. Synthetic and mineral-based, so the additive itself is vegan and halal; the meat around it is the real question.
Related additives
Classifications reflect common manufacturing practice and mainstream certifier positions; individual products and certifiers can differ. Not medical, nutritional or religious advice.