I read a very disturbing article on Protein Shakes which has made me stay away from them. They are not controlled by the FDA due to the fact that they are supplements. Also, whenever you “drink” any calories the glycemic index goes through the roof. You are always much better off getting your protein from food, i have been relying on full fat Greek Yogurt, FAGE which has 20g of protein per serving. With all that being said, the Primal Fuel supplement would be your best choice for staying Primal but its very expensive.