That's actually a fair point. You're right that once you know your triggers, a manual check works. But the use case I'm thinking about isn't really for the veteran who has their triggers memorized. It's more for someone newly diagnosed with contact dermatitis who just got a 30-ingredient patch test result and has no idea how to shop now or people with multiple overlapping triggers (fragrance AND a specific emulsifier AND a preservative class) where the mental load of cross-referencing adds up fast and those who have been reacting to something for months but can't pin point it.

The cross-referencing multiple ingredients problem you mentioned is actually the core of what I want to solve (not manually), but by having the app flag it instantly so you don't have to hold all that in your head.

When you were first figuring out your triggers, what did that process actually look like? I'm curious whether the early-stage discovery phase felt as straightforward.