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Potassium salt of sulphurous acid.
Function & characteristics:
It is a white, non-stable powder, which reacts with oxygen to form potassium sulphate. In acidic conditions it forms sulphurous acid, which acts as a preservative.
Acid preserved fruits, wine, etc.
Acceptable Daily Intake:
Up to 0.7 mg/kg body weight.
Side effects:
It is reduced in the liver to harmless sulphate and excreted in the urine.
People who are intolerant towards natural sulphites should also avoid added sulphites (E221-228).
Dietary restrictions:
None – sulphur dioxide and sulphites can be consumed by all religious groups, vegans and vegetarians.

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