Here are what are claimed frequency can be used to heal our (certain part of) body. In my opinion, they work if the "transmitting" frequencies are meet with the receiving frequency in our body. I have heard a professor of physic of MIT, Prof. Walter Lewin, explains that our heart acting like tiny alternating current battery, which alternating between inner of the heart and the outer (atrium and ventricle). That alternation makes our heart just like dipole antenna with frequency is our heart beating (around 74Hz). I never heard any other something like transmitting and receiving signal in our body. If so, so what are the claimed such these frequencies so they are claimed can heal our illness? Which part of our body are they? I am not asking for detail, just asking the name of the part of the body.
The claims you've linked to have no support within modern science, and they never have. Those frequencies are not "received" by any specific part of the human body, and there is not a shred of evidence that they will have any health effects above those of a placebo.
If you don't believe this, go ask them to point you to the clinical literature (controlled, randomized clinical trials) that supports their claims. This site is for physics, and the claims you've linked to have nothing to do with science.