well I feel the best protein source out is the size up 1000 by worldwide nutrition, it has 1000 cals, 150 gms of carbs, 40 grams of glycerol, 50 grams of protein, 4 grams of glutamine peptide, no sugar, no aspartame, and no ftc food colors...........the fruit punch or orange cream are good, you can go to their WS at www.sportnutrition.com, or call at 18008545019