E133 is a food additive used to colour various foods and drinks. Generally food colouring agents are vegan, but there exceptions. In the case of E133 however it’s entirely synthetic and vegan.
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E133 is often referred to as “Brilliant Blue” because of the, well, brilliant blue color it gives to whatever it’s put in. In North America it’s often called Blue #1.
Is E133 Safe to Consume?
It’s not highly toxic or anything like that, and is widely accepted around the world as a food-additive that’s safe. There are a few countries that have banned it though, and some people may experience mild allergic reactions to it, so consuming a lot of it is definitely not recommended, however a little in your diet is likely to be non-impactful on your overall health.