In a metaphysical sense, dis-ease within oneself and ones place in ones world can manifest in many different ways.
Pain killers are, much like all medicine, sticking plasters. The root cause of something like arthritis will not be addressed by pain killers, although being able to live with it becomes less tiring. For some, copper bracelets will work for them. That is their truth. Who are we to nullify their truth?
My point being, unless you try to realise your own truth as to what works for you as an individual, then to sweepingly state that this doesn’t work or that doesn’t work because a few hundred people have indicated that it doesn’t, means rock all in the great scheme of things.
I doubt if clinical trials have been held or conducted to test the efficacy of nettles on arthritic joints and if they were, wonder what the results may show. However, in the test case of one, for that individual, they work. That is their truth and that is their reality.
To dismiss that is foolish