Yes. DD2 was corn free for about a year when I started giving her a probiotic. She kept getting folliculitis and I couldn't figure out why. Then with the help of the ladies here, figured out that the probiotics had citric acid in them. Stopped them, and the folliculitis went away (after 2-3 failed rounds of abx). Corn is a hard one. It's hidden under so many different names. And for us, absorbic acid is tolerated, but not citric acid (well, we just got that back 3 weeks ago, after 2.5 years off it). But dextrose, maltodextrin. And it's in basic stuff like baking powder and iodized salt. It's also in some toothpastes, a lot of vitamins/supplements, etc. Do you know all the different names? It's by far the hardest one to avoid, I think.
I'll be getting someone to print the list for me, today.
