An artificial sweetener. There is some data that says these can lead to yeast infections for those who are already prone to them, and some people can have an allergic reaction. But it's present in other foods, like canned fruit, diet sodas, and candy, so if you haven't had an allergic reaction to these foods before, you're probably safe to ingest it. Just keep it away from any sensitive mucous membranes if you're prone to yeast infections.
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