anything besides whey? whey protein tastes really bad IMO ..
i was wondering if something liek these would work .
http://www.advantagesupplements.com/...ter-shock.html
or
http://www.vitacost.com/Endurox-R4-R...=00-46692188-2
-edit- arent those pretty much the same thing but not p90x brand? they are 4 to 1 ratios