Well frankly, I don't buy that homeopathy has any efficacy beyond placebo, however placebo is quite powerful. I know, also, that the reason homeopathy exists is that the medicines in use 200 years ago were highly toxic, and dilutions of them allowed people to get better instead of dying of the treatment. Still today the homeopathic remedies most in use are dilutions of highly toxic substances. A little poison ivy is the least of it, compared to gonorrheal pus (medorrhinum) and all the heavy metals (ledum, arsenicum, etc).