Sodium Hydrosulfite
Sodium hydrosulfite is permitted in limited food applications (e.g., 21 CFR 172.892 lists it for bleaching food starch), with sulfite residues in the finished food. Sulfites are FDA major allergens — products containing >10 ppm sulfite must be declared, and sulfite-sensitive individuals (especially asthmatics) can experience severe reactions.
What it is
Sodium hydrosulfite (sodium dithionite, Na2S2O4) is a strong reducing agent used industrially as a bleaching agent for paper, textiles, and food.
Reducing/bleaching agent and processing aid; releases SO2.
Why it's flagged
- sulfite residues — FDA-declared allergen >10 ppm
- asthma triggers in sensitive individuals
- FDA prohibits sulfites on most fresh fruits/vegetables
What regulators actually say
"FDA established a regulation requiring the declaration of the presence of sulfites in foods at levels of 10 ppm or greater... FDA also prohibits the use of sulfites on fruits and vegetables intended to be consumed raw."
Regulatory status
United States — FDA
Permitted as processing aid for specific bleaching uses (e.g., 21 CFR 172.892); sulfite labeling required >10 ppm
European Union — EFSA
Sulfites authorized E220-E228 with use limits and labeling required
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