Hmmm.
Homeopathy is such a controversial area! I have college degree and master degree in science (pharmacology and cell biology), therefore, my opinion on homeopathy is not the most nice and gently one.
Every cells of tissues and organs can be triggered by pharmaceuticals, natural or things secreted by your own body, as hormons for example. Responses to such components depends of the concentration at the specific time of exposure, and usually the effects will follow a pattern of sigmoidal function (
http://en.wikipedia.org/wiki/Sigmoid_function). If the concentration is just too low, there is not much chance that the changes will trigger a physiological change that can be measure, or felt in the case of something you eat/add to your diet.
But people do claim to feel the effects of homeopathy. How's that? Personaly, I think it is coming from the placebo effect. You think you're taking something, and the body reacts. After all, brain and emotions can triggers physiological changes! Homeopathy got really trendy at some point, but sadly I think it is just companies making money over people
I'm not really interested in paying for placebo effect.
A teacher during my pharmacology degree was comparing homeopathy to this situation. Take a pill, throw it in the river. Then ask someone who are standing 500 meters down the river to get a glass of the water flowing. You've just turned your pill into a homeopathy remedy
There is also the fact that (it depends from where you are from though) in Canada, for example, homeopathy products are not subject to the same regulation as usual pills. Meaning : they can put everything they want in that and are not subject to examination of quality assurance test, which is tricky to me.