
The biggest problem with any 'MASS MARKETED' program is that it can't evaluate your motor skills or whether your fit enough for the exercises presented in the various DVD's. Granted they have a self assessment to determine if you are capable, but obviously this can't take the place of a qualified professional's assessment. So, in this sense, it can be potentially harmful.
The fitness program is very good and effective. It offers a lot of variety and not just bodybuilding routines.
As far as the nutrition "Recovery Shake", which is what I want to focus on, this is the program's biggest weakness. Joe Cannon reviews supplements that are currently popular.
His website is www.supplement-geek.com.
Rather than reinvent the wheel, I've included the link below which is very comprehensive. Enjoy!
http://supplement-geek.com/p90-x-recovery-drink-review/