Preservative (E 224) is a food additive which is a well established and proven preservative used in the wine and food industries. It is a white crystalline powder which is a potassium salt of sulphurous acid. It is produced synthetically hence is 100% Vegan. As with other sulphurous acid salts, it's addition to foods reduces their vitamin content.
Preservative (E 224) should be avoided by individuals who are intolerant to natural sulphites.(1) Exposure to it may cause severe burning and damage to the eyes, irritation, and reddening of skin and difficulty in breathing. If exposed in its raw, unprocessed form, one should immediately seek medical attention.(2)
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