Sheesh, no wonder people don't go to GNC.
Really the differences are from they way they are processed.
Whey Protein Isolate- Faster Digesting, lower fat/cholesterol than whey concentrate.
Whey Blend- Too vague, you need to be more specific, could mean several different things.
Whey Concentrate- Majority protein source in products like GNC 100% Whey and Optimum Nutrition Gold Standard. Moderate cholesterol amount (Companies are doing a better job regulating it now), a little slower digesting than WPI.
Whey Opti-Blend- Again, too vague, probably a protein complex IE...Soy, Whey, Egg and Casein Blend.
Would I pay the extra dollars for a straight Whey Isolate like Isopure or Wheybolic, probably not. Which is why Optimum Gold Standard is best for someone that is concerned about the extra buck.
<message edited by localoutoftowner on Monday, June 16, 2008 10:19 PM>