Recommended by my trainer. I chose unflavored so I could pick the flavor of my choice without competing flavors. It says it has no flavor, but it does it takes like milk. It is very foamy which I didn’t expect but it is fine once you get used to it. You can use a shaker which really makes it frothy or you can use a blender if you want to add frozen fruit or ice. If you use a blender do not fill it to the top because this acts like yeast and rises so fill three quarters.