There has been much valid scientific research on the effects of melatonin for various things, this example being just one. Please note it was along with standard cancer treatments and not in place of same. This example is not support for those against scientific standard research to show something is effective. The companies who produce it will be happy to sell as much as you want, just like any marketer of drugs shown to be effective using such standards and by which the consumer can be an informed consumer and not subject to a pig in a poke. ""The researchers found a consistent benefit across all melatonin dosages on one year survival when the hormone was tried as an adjunct therapy in a variety of advanced stage cancers." http://debunkbigpharma.blognation.us/blog/_archives/2005/9/10/1216063.html"