Hi StarBrite----
I have used Dr. Clark's kit before, but I can get clean, high quality herbs from my local natural foods store, so I get the ingredients there.
As for your back and knee condition, I would suggest locating a Certified Massage Therapist near you. Find one, if you can, that specializes in deep-tissue technique and/or is trained in Myofascial Release techniques. Check certification and references, since you don't want to be screwing around with this. You may need at least four to six visits to get everything released for proper relief. If you weren't in NC, I'd have you come visit me for the work (MI). Let me know what you decide and find out.