Allergies are caused by proteins. Sweetener is sugar, a different kind of chemical. We should not assume [and worry] that there is a problem here. Not when the matter is so easy to check out.

I'm allergic to corn syrup. And also to other products made from corn, like citric acid. The reason I know this is because if I eat those things, I get very sick and I stay sick until I stop eating them. With some corn products, it's anaphylaxis. With others, it's other kinds of sickness.

I was almost completely bedridden for almost ten years until I discovered, by living for several weeks in another country where they don't put corn in everything, that I am allergic to corn. I found this out because I stopped being sick while I was there, and when I returned to the US, I got sick again until I stopped eating corn (and the other things I'm allergic to).

If I eat corn, I get sick. It's pretty simple and very predictable.

Food tastes better when other sugar besides corn syrup is used anyway. I found that out by living in another country as well.