I went ot one when I was coming out of college. And yes it was in Arizona. I was coming off knee surgery, I had torn 3 ligaments, much like Rodney did and they did wonders for me. And while I did take a lot of vitamins and supplements, I do not think they gave me anything that was ever illegal or would cause serious side effects down the road.
I am sending my son (15 years old) to one right now. As a six foot, 230 pound ILB, they have reduced his 40 time from 5.56 to 4.98 in less 6 months, increased his strength by 11% and increased his flexibility by 4%. The only thing they've given him is either water or gatorade.