Also, how do you check for cross-contamination? I’m deathly allergic to peanuts, but life has gotten a bit easier as everyone started to clearly label food that has it or has been processed with it. A carrot allergy seems much harder to handle. My thoughts are with you as this must be a tough allergy to have.
I grow a few plants in buckets, stuff I eat regularly, and bell peppers for my guinea pigs. I tend to stick to eating the same brands and flavors of package foods however I ALWAYS have to read the ingredients. Carrots are a cheap filler so a lot of foods have them, a lot of beverages use carrot juice for coloring. I really just make choices in advance to prevent exposure