John
What you're referring to in your daughter, is almost certainly caused by postural problems, which can be corrected.
Just yesterday, my husband was in discussion with a cardiologist and orthopaedic surgeon who went into great detail about the short term effects achieved by these and other additives or rubs, etc.
They said there was no real benefit to the UNDERLYING PROBLEM in using any of them, but conceded, that correction could be achieved through an accomplished practitioner, of some manipulative therapies, when there was a distortion, through trauma or bad posture, etc.
I do know, however, of long term relief being achieved with magnets and low level laser.
My knowledge is first hand, as a sufferer and second hand, as my husband practices pelvic and spinal alignment. He was having an angiogram yesterday to determine whether, or not he will require heart surgery. Very scary !
If you believe something works for you, keep taking it, but if the problem keeps coming back, listen to your body !
good luck
angie