Hi, Sandie, my rny is tomorrow. I have been using (and will continue to use) Gold Standard Whey Protein powder. I have only used the vanilla ice cream flavor. It has 25g of protein per serving and you can mix it with milk or water, coffee whatever. I like the taste. If you have lactose tolerance issues then the best is Isopure pure whey protein. of course you cannot mix with milk. I use it because i like it, and since I have no lactose problem i mix with milk. Both are available at GNC or Vitamin Shoppe. The Isopure is twice as expensive and it also has vitamins. Both are very low carb, no fat, and less than 2g sugar. They can be a little sweet, so at times I mix some plain cocoa in it or instant coffee.