protein isolate vs portein concentrate?

I just bought a bunch of the GNC Go Lean premade protein drinks cuz they had a special on them, but then I recalled someone posting before about the protein concentrate not being the protein we need.. and sure enough that's what's in it.
Anyone know?

 Whey protein isolate is the type recommended by most surgeons because it is what the body can use best.

 You are right. It must be 100% whey protein isolate.

Whey protein isolate is best because it is 90+% protein with 99.9% of the lactose removed.  Whey protein concentrate is next.  It has some lactose in it (so sugar).  OK as long as the carbs fit within your plan.  Casein protein concentrate is next.  Not as good as either whey type.  Last (and definitely least) is collagen.  Complete junk that we need to avoid.

I don't know how the soy and egg proteins fit in here... but this is what I know about the other proteins.

Isolate is the most concentrated, with the highest percentage of protein; whey protein concentrate a bit less - so it is slightly higher in sugars and fats. The fats do, I have read, make you feel a little fuller for longer with the concentrate. I use a brand that has a bit of both and that has worked pretty well for me.

OK so then, if it says it has say 25 gms of protein does it mean I won't actually be absorbing those 25 gms then it's the concentrate rather than 25 gms of isolate?

* oh and I made an error they aren't called Go Lean they are called Total Lean, Lean shake
They have 6 gms of carbs 2 gms of sugar and 25 gms of the protein

Whey isolate is prefered. I do though use Lean Dessert a lot and that is a blend. Awesome taste!

Also protein from food is better utilized by the body than protein supplements.
Does anybody know how many grams of protein one can assimilate per meal?
As an example my nut said its pointless to double the amount of portein in a protien drink because your body can't assimilate all of it but had no advise on just how much your body can utilize.
Does anybody know?

I did hear once what the amount was but I forget.. I'll have to search and see if I can find it.