Many of the homeopathic remedies are so diluted that according to the known laws of physics and chemistry, they couldn't possibly have any effect. Once you get beyond a certain point-24x or 12c -there is probably not even one single molecule of the original active substance remaining. This fact is often pointed to by critics of homeopathy as they dismiss the effect of homeopathy as merely due to placebo effect.
And yet, according to homeopathic doctrine and experience, the more diluted the solution, the more potent it is. Homeopaths contend that the remedies work and they see no reason to stop using them simply because we do not understand how they work. They often argue that pharmacologists cannot explain exactly how most conventional drugs work. For example, even aspirin is not fully understood in terms of how it works, but physicians have no difficulty in recommending its use.
Over the years several theories have been proposed to explain the action on homeopathic potentization.