actually they are designed to fill in the nutrition lacking from the AVERAGES being tested.
the ProAdd and ProGrass are both great products if you have a obese horse go with the ProAdd Ultimate from what I understood talking to Progressive was that it has fewer calories per serving :)
Saddlebag hay testing is not always feasible to everybody for one reason or another and these products are helping ALOT of overweight horses get the needed nutrition without the added calories of traditional feeds
I have been called the NSC Nazi more then once ... I hate traditional feed methods of loading our horses up on grains and junk food :)