Grapefruit will be mentioned in the ingredient list if it's present in significant amounts. Many allergens, such as peanuts, which can cause severe anaphylactic

Grapefruit will be mentioned in the ingredient list if it's present in significant amounts. Many allergens, such as peanuts, which can cause severe anaphylactic reactions and can affect many people, are prominently mentioned, including if the facility that produces a product also deals with them. Beyond that, it's really on the consumer of food to make sure they are not ingesting anything that can cause harm to them. Ascertaining grapefruit presence in the food falls squarely in this category. If you can not be sure that grapefruit is absent in a juice, do not drink it. It's that simple. And if something says grapefruit prominently on the packaging (I imagine grapefruit juice in its original packaging would certainly fit the bill), then it's really the individual's responsibility.