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."