What is required to have on a food label for allergens?

Food labels must clearly identify common allergens, which include milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, and soybeans, as mandated by the FDA in the U.S. These allergens must be listed in plain language, either in the ingredient list or in a separate "contains" statement. Additionally, any cross-contamination risks should be communicated, though this is not legally required. The goal is to ensure consumers can easily identify potential allergens to make safe food choices.