I am unsure of what is exactly, however, he has a case of those little bottles & each on has a label, they contain different things. He will ask me to hold one of them in a certain area then he will ask me to raise my arm or leg & resist his attempt to push it down, then he will remove the bottle & do it again to check my strength, I'm guessing. He doesn't charge extra for anything & he is a hands on man too, not many fancy machines there. I have noticed iridology posters in some rooms & he does homepathic as well. He's not $$$ hungry which is impressive to me. He will & has treated the whole family for the price of one. I like him! I hope the BFC works well for you & you have relief soon, I know how excruciating back pain is 1st hand. Sometimes I feel like I'm going to loose my mind if I don't get relief. Pain has a way of changing your personality. I am beginning my fast tomorrw, well actually today but just b/c I don't feel like eating. I wish you the best!