So called "skeptics" of homeopathy love to falsely claim that there is no proof that ultra-dilutions are anything more than plain water - having no effect what-so-ever.  Their "the system is implausible therefore impossible" argument  is the unscientific basis for their rejecting all evidence of homeopathy's effectiveness.
Now there have been hundreds of basic science, pre-clinical and clinical research studies showing that homeopathy works.  But just one that is indisputable is all one needs to prove that ultra-dilutions - homeopathically prepared ultra-dilutions are active.  If they work - they work.  End of the argument.
Well there is now indisputable, reproducible evidence for that fact - evidence that has been published in countless peer reviewed journals.  In the last 25 years, there have been a repeated series[1] of in vitro experiments on the allergic response to anti-bodies using the human basophil degranulation test.  These experiments have been conducted independently and on a multi-center basis in distinguished university research centers around the world.  What these tests have shown is that extremely high dilutions of histamines (dilutions well into the ultra-molecular range, i.e., beyond Avogadro's number) consistently produced measurable basophil reactions (basophils are white blood cells produced by the human body). These reactions are only possible - repeat - these reactions are only possible if homeopathically prepared ultra-dilutions are active substances - something more than just plain water. 
This evidence for homeopathic ultra-dilutions is incontrovertible.  It is time to look at evidence of homeopathy's effectiveness with a scientific mind - an open mind - so that the wonders and immense benefits of this system can be fully explored.

1. (Sainte Laudy and Belon, 2009; Endler et al. 2010; Belon et al. 2004; Eizyaga 2007)