Does it make a difference the sosurce of protein one gets? Soy, plant or whey? Also, is there a good site to order the protein from?

most people go for the whey at the beginning, I have both whey and soy only because I was using soy before lapband. and because one offers a flavor not found in other brands. You can go to local health food stores, even Wal-mart carries, Best thing would be to check with your doctors office for type. If you can add 1/2 banana, some people add yogurt. Lots of ways to spice up the drink.

Good Luck.

http://www.unjury.com/store/protein/unjury-flavors/unflavored-protein.html

http://www.mybariatricpantry.com/SYNTRAX_NECTAR_PROTEIN_POWDER_SAMPLES_p/nectar-sample.htm