The most common ones in food and the most common ones in the air. Our idea was to track how people react, compile a log and have it processed so that we can tell them - yup you have this one allergy because of this pattern of what you ate, did, the air you breath etc. based on the evidence submitted. It was a very long "LOG" but if people were serious about compiling it and didn't l eave things blank, the folks on our med team were certain we could have given them a "cure" that worked for their allergy.

Ofc, this wouldn't work with super extreme cases where you're allergic to a very specific uncommon thing. but this is a 80/20 solution.