Try having an extreme sensitivity to sulfur dioxide. It’s not legally an allergy, since I can’t die from it, but let’s just say it makes me wish I could. The toilet becomes my home for at least a half hour VERY quickly after eating something with it. It’s primarily used in dehydrated fruit, which sucks because I love dried fruit. Especially mangoes. Luckily, organic or unsweetened dried fruits don’t use it.