What is the difference?

That and a few dollars. I guess it's up to you whether or not a little Bovine Serum is worth a few extra dollars.
 
I believe the I Pro is what they sell internationally too. BTW, I'd just do a cheaper alternative. After all, who actually takes Whey for the added bovine serum ?
 
I know some who swear by the GF, but personally I picked up a couple tubs of the I pro since it is on sale. I have to say the green apple taste exactly like a jolly rancher.
 
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