Oat milk is big and its success is admired! It's the fastest-growing segment of the US plant milk market. Sales jumped by an impressive 72% in 2021. But two-thirds of oat milk's growth came not from taking business from dairy milk, but by taking sales away from other plant milks. Almond, coconut and others all fell in 2021. Meanwhile, there's an even bigger and more successful product than oat - lactose-free dairy milk. It's growing faster than oat and is bigger than any type of plant milk. Time: 10 minutes.