Unflavored Protein Powder
Unjury works well. However, Lilyvalley's remarks did prompt me to remember that you'll want to be aware of the temperature of the food or beverage to which you add the powder. I believe Unjury says not to exceed 130 degrees F?. If you do, the protein takes on a texture similar to the white of a fried egg.
RNY on 01/10/12
I have unflavored Jay Robb. It doesn't work well with clear liquids (it makes them milky), but it's fine in milk-based things.