If you’ve been running around in skeptical circles for any amount of time, then you’ve no doubt heard of the quackery called homeopathy. According to the Skeptic’s Dictionary entry on homeopathy…
Classical homeopathy originated in the 19th century with 
Samuel Christian Friedrich Hahnemann (1755-1843) as an alternative to the standard medical practices of the day, such as phlebotomy or bloodletting. Opening veins to bleed patients, force disease out of the body, and restore the humors to a proper balance was a popular medical practice until the late19th century (Williams 2000: 265). Hahnemann rejected the notion that disease should be treated by letting out the offensive matter causing the illness. In this, he was right. On the other hand, he argued that disease should be treated by helping the vital force restore the body to harmony and balance. In this, he was wrong. He rejected other common medical practices of his day such as purgatives and emetics “with opium and mercury-based calomel” (ibid.: 145). He was right to do so. Hahnemann’s alternative medicine was more humane and less likely to cause harm than many of the conventional practices of his day. …
Homeopaths refer to “the Law of Infinitesimals” and the “Law of Similars” as grounds for using minute substances and for believing that like heals like, but these are not natural laws of science. If they are laws at all, they are metaphysical laws, i.e., beliefs about the nature of reality that would be impossible to test by empirical means. Hahnemann’s ideas did originate in experience. That he drew metaphysical conclusions from empirical events does not, however, make his ideas empirically testable. The law of infinitesimals seems to have been partly derived from his notion that any remedy would cause the patient to get worse before getting better and that one could minimize this negative effect by significantly reducing the size of the dose. Most critics of homeopathy balk at this “law” because it leads to remedies that have been so diluted as to have nary a single molecule of the substance one starts with.
And this is the real rub with a notion as loony as homeopathy. We already know from modern science-based medicine that, in the case of drugs, there must be a certain amount of active ingredient in the drug in order for it to have the desired effect. Of course, there are dangers from using medical drugs: one of the most common is that of over-dosing. If someone takes too much of a certain active ingredient, it can be harmful or – in the worst case – fatal. For example, we all know about stories of people committing suicide by over-dosing on sleeping pills.
However, with homeopathy, this is all turned completely on its head. Homeopaths, invoking their magical “law of infinitesimals”, insist that by diluting the active ingredient to the most ludicrous extreme (i.e., imagine diluting a solution so much that only one molecule of active ingredient remains in it) this will somehow transfer the healing power of the ingredient to the patient and actually make the solution more potent.
A classic example of debunking this particular woo-woo claim has been performed numerous times by James Randi as he lectures on the topic of homeopathy & other quackery. As he lectures, usually for roughly an hour, Randi will consume an entire bottle of homeopathic sleeping pills that he’d purchased earlier from a nearby pharmacy. Needless to say, despite performing this feat numerous times, James Randi has yet to die from such an “over-dose”.
Another good example of this very exercise in skepticism of homeopathy is outlined at this Youtube video by Ziztur. I wonder what happened to her?…
In an effort to illustrate the silliness behind these nonsense homeopathy claims more broadly in the public eye, an organization calling themselves the 10:23 Campaign: Homeopathy, There’s Nothing In It has designated that they will be conducting a “mass suicide by homeopathy” on January 30th. The whole “10:23″ bit is a play off of Avogadro’s Number (6.022×10^23 particles per mole) that one learns about in basic chemistry class – the idea being that if you have an entire mole’s worth of solution (not unreasonable) that, by homeopathic standards, there is likely only one molecule of active ingredient in it.
To sum up, I shall finish with a joke:
A man is walking naked down the street when a police officer pulls him over. As the man is being placed into the back of the squad car, having been arrested for indecent exposure, he protests, saying: “But officer, you don’t understand! I’m wearing my homeopathic pants!” 
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