How did milkmen handle milk allergies or dietary restrictions?

In the past, milkmen did not have much knowledge about allergies or dietary restrictions. They would usually just deliver the same type of milk to every household. However, as awareness and understanding of food allergies and dietary restrictions grew, milkmen began offering alternative milk options such as lactose-free milk or plant-based milk. Additionally, customers could also inform their milkman about their allergies or restrictions, and they would make sure to deliver the appropriate milk.