Am worried now in case the NI study I've mentioned doesn't involve homeopathy - thought it did when I posted on this thread but am now losing confidence in my memory!
Anyway, chegirl makes a very good point about cancer. Many cancer hospitals use complementary medicine, including homeopathy in some cases, to support patients suffering from the severe effects of the disease itself and of treatment. I think the Christie in Manchester uses comp. med to treat needle phobia in chemotherapy patients, although I can't remember which therapies.
Also, IME homeopathy does have something like side effects. I went to see a homeopath about chronic migraine - similar story to Jemm, was very reluctant but thought sod it, at this point I'll try any mumbo jumbo, can't hurt.
Bizarrely, the sugar pills gave me the biggest dose of thrush I'd ever had. I was FURIOUS but the homoepath, irritatingly, was pleased because it showed the therapy was working.
The thrush had been caused by conventional medicine (one course of antibiotics, known side effect - GP didn't warn me - recurrent bouts of thrush as a result).
Thing is, after that initial reaction, I've never had thrush again - that's 12 years ago now.
One case study is not definitive scientific proof, of course. But in my case homeopathy certainly did have what I'd describe as side effects - immediate and dramatic and ultimately beneficial. Which suggests something biologically active is going on.
(Don't have migraines any more, either, but not sure exactly when they stopped - it's not as clearly linked with homeopathy in my memory but that could be because I was so darn cross about the thrush...)