As an addendum to the above post - whey protein is best taken after exercise because it is quickly assimilated. Casein protein is assimilated more slowly and is better for a mid-afternoon snack (e.g., cottage cheese with sliced strawberries and a little splenda - my current fav.)

I put a dash of vanilla whey protein in my water bottle with Cytomax. It tastes like a smoothie and helps retain/build muscle mass, as the protein is used by the muscles during exercise. I also take a bottle of regular water for normal hydration.