I have a copper bracelet with magnets, and wear it occasionally. I've never noticed any improvement what so ever, but that's me. Maybe different for you and yours.
I'm prepared to believe that we all have slightly different 'magnetic' fields. I can't wear a wind up watch for any length of time (IE more than a few months) without it breaking down. Quartz, I'm fine with. My Mum is e same, and while I'm prepared to imagine I might be crap at remembering to wind one, she's very organised about things like that. If people can have different tolerances to cold, for example, then why not different reactions to magnetic fields and so on.
By the way, a Uni colleague of mine who trained as a vet, and was married to a vet, told me that the placebo effect even works on pets - presumably through the owner believing in the treatment.
And someone with a minor ailment, one that will clear up soon anyway, could well feel better quicker for having been listened to and sympathised with - they are just as ill, but have something positive to think about.
Apparently, placebos can be even more effective when adminstered by injection than pill, as an injection is seen as a more important intervention. Likewise, if the practitioner wears a white coat. Even packaging the same painkillers in a shiny foil blisterpack box can give a 'better' result than the same pills loose in a plain white tub...