Dunno, but my new book (Woman's Guide to Cycling) says that the best recovery drink--better than all the Hammer and Accelerade recovery drinks--is plain old chocolate milk. That's been my recovery drink of choice for several years because I like it and it works and it's cheap and you can always find it in any convenience store and it makes a great bonk-stopper on a long ride.

Obviously, I'm not a big fan of engineered athletic formulas, although I do take diluted gatorade on long rides (over one hour).