I know alot of people turn up their nose, when they hear buttermilk, especially if it isn't being used in baking or something similar, I am the same. When my sister told me about this smoothie, I was not too thrilled, but it turns out to be very good, and doesn't have that bitter buttermilk flavor. And of course it's good for you, cultured dairy foods, like yogurt and buttermilk, keep your digestive tract healthy.