The Cornocopia Institute indicates that there are “milk plant codes” on milk cartons, to help you figure out which facility is packaging (animal) milk from large dairies. For information see: https://www.cornucopia.org/action-alerts/aurora-milk-plant-code/
Of course, we prefer that you consume vegan milks! See: https://www.vrg.org/nutrition/milk_alternatives/index.htm
The contents of this posting, our website, and our other publications, including Vegetarian Journal, are not intended to provide personal medical advice. Medical advice should be obtained from a qualified health professional. We often depend on product and ingredient information from company statements. It is impossible to be 100% sure about a statement, info can change, people have different views, and mistakes can be made. Please use your best judgment about whether a product is suitable for you. To be sure, do further research or confirmation on your own.