while there is this "window" post workout, I think alot of the High fructose post workout hype was perpetuated by the great schill Bill Phillips to sell Phosphagen Hp and the INSANLY priced Beta-something (it was that little tub that had creatine and HMB)
honestly (imho), anything postworkout will work
however, I do see benefit in post workout BCAA and a teaspoon of Glutamine