It is not according to the directions, but I use the CytoSport Muscle Milk as a meal replacement shake and I love the taste! I mix the following in the Magic Bullet on my way out the door in the mornings:

Blueberry Muffin Shake
8 oz skim milk
1 scoop Blueberries 'n Cream Muscle Milk
5 crushed ice cubes
2 oz water
1 T raw cut oats or flax seed

I use the Magic Bullet because all my mess is contained in one item that doubles as the glass that I head out the door with. The only downfall is that it doesn't fit in my cup holder very well.

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