Hello and Welcome to Spark People!
A good place to post your question is in the Diet and Nutrition Forum. I am sure someone there has the information you are looking for in that forum. Also, you might try do a Sparkpeople search to see if you can locate articles or recipes that address this as well.
I, myself, do not use protein/weight loss drinks, so no first hand information for you.
Good luck! Welcome to Spark People!