Hi Julie,
It will be good to hear what others have to say about this product. I tried Rhubarb back fifteen years ago when the research was first done suggesting a benefit in renal failure, but I never saw it work. Perhaps this new-fangled version will work better, but one generalization I can make is that if the whole herb extract wouldn't be suited from a Chinese medical perspective to the patient, then a standardized extract will similarly be unrewarding. For many CRF patients, Rhubarb possesses exactly the wrong energetic (cold and purgative vs. the tonification that is often needed). I would speculate if it would help any of our patients, it would be the ones that we use XCHT or SRT in.
Hopefully there will be some other input on your question, instead of my usual pontification.
Steve