我有想过用neem oil， 可是兽了一下，有文章说neem 有副作用，所以不敢用..

Studies done when Azadirachtin (the primary active pesticidal ingredient in neem oil) was approved as a pesticide showed that when neem leaves were fed to male albino rats for 11 weeks, 100% (reversible) infertility resulted.^{[citation needed]}

Neem oil and other neem products such as neem leaves and neem tea should not be consumed by pregnant women, women trying to conceive, or children.^{[citation needed]}

There is some evidence that internal medicinal use may be associated with liver damage in children.<sup>[2]

Quoted from http://en.wikipedia.org/wiki/Neem_oil</sup>