It's a good question. I've heard only anecdotal stories about neem
leaf's extract, oil or tablets having a contraceptive effect in men.
I don't know what studies of neem in men the neemfoundation.org
website is referring to. Searches of scientific literature show that
the only contraceptive tests have been in animals.

You can read more about the tests in animals here:
http://www.malecontraceptives.org/methods/others.php

Does anyone have personal experience with this? Or other reliable
sources of information? It's possible that there are studies in the
Indian medical literature that haven't been cataloged by the US's
National Library of Medicine...

Also, the story about the Indian soldiers taking neem oil as a
contraceptive is something of an urban legend. The original reference
that this story sprang from was written in 1992 ("Neem: A tree for
solving global problems" National Academy Press: Washington, DC), and
reported that the _wives_ of 20 soliders in the Indian army
successfully used neem oil as a post-coital contraceptive.


> I have recently read about Neem leaf tablets, that can cause temporary
> sterility. Has there been further research on this or
> experimentation? I found the tablets online they are 20 bucks for 90
> pills. Here are the links, if anyone knows more about this i would
> like to hear about it.
> mwolken@...
>
> http://www.neemfoundation.org/health.htm
>
> might just be a bunch of kooks
>