I believe it's crowdsourced. There are many items I eat that they don't have in their database. The app allows you to submit the nutrition info to their databas

I believe it's crowdsourced. There are many items I eat that they don't have in their database. The app allows you to submit the nutrition info to their database and it gets recognized afterwards. MyFitnessPal is very popular. They should have one of the biggest databases out there.