Sulfiting Agents
FDA requires labeling of sulfites at >=10 ppm because they can trigger severe asthmatic reactions in sulfite-sensitive individuals (~1% of population, up to 5% of asthmatics). Banned by FDA on fresh fruits and vegetables intended to be served raw since 1986.
What it is
Umbrella label for a class of sulfur-based preservatives including sulfur dioxide, sodium/potassium sulfite, bisulfite, and metabisulfite.
Preservative and antioxidant; prevents browning, controls microbial growth, used in dried fruits, wine, and processed potatoes.
Why it's flagged
- asthma triggers in sensitive individuals
- FDA-mandated allergen-style labeling >=10 ppm
- banned on raw produce
What regulators actually say
"Sulfiting agents added to a food must be declared on the label of the food when present at a level of 10 ppm or higher."
Regulatory status
United States — FDA
Permitted with mandatory labeling at >=10 ppm; banned on raw produce (21 CFR 182.3739, 182.3766, 182.3862, 101.100)
European Union — EFSA
Permitted as E220-E228 with ADI and labeling requirements
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