What it is
E450 is a family of diphosphate salts (pyrophosphates). Synthetic from phosphate rock.
Why it matters
Leavening agent in instant baking powder, water-binding agent in processed meats and seafood, stabiliser in dairy products.
What to do
Always vegan. The closely-related E451 (triphosphates) and E452 (polyphosphates) are also vegan.