When a label says “may contain,” it means there is a possibility that the food came into contact with an allergen during manufacturing. This is not about ingredients that are intentionally added—it refers to potential cross-contact.
For example, a product might not include peanuts in the recipe, but it could be made in a facility that also processes peanut products. Small traces could end up in the final product.
This type of labeling is voluntary, which means companies are not required to use it. That’s why you might see different wording like “may contain,” “processed in a facility with,” or “made on shared equipment.”
For families managing food allergies, this is where personal comfort level comes in. Some choose to avoid all products with these warnings, while others make decisions based on the specific allergen, the brand, and their past experiences.
It can feel unclear because “may contain” labeling is not standardized or strictly regulated in terms of wording or thresholds. Different companies may use these statements in different ways, and there is no universally defined level of risk attached to them.
Researchers and regulators have explored the idea of establishing threshold levels for allergens, but there is currently no universal system in place in the U.S. that ties those thresholds directly to “may contain” labeling.
It’s best to work with your allergist, who understands your specific situation and can help you navigate this often gray area.
There is no one-size-fits-all answer. The goal is to understand what “may contain” means so you can make informed choices that feel right for your family.
It can also be helpful to contact the manufacturer directly to ask why the statement is used and what precautions are in place. This can give you more context to help assess your level of comfort with that product.
