I emailed Sarah at http://www.owndoc.com
and asked her about the chinese Lufenuron and this is what she said....
"The Novartis product is safe but extremely expensive.
The Chinese Lufenuron - all of it - is extremely dangerous to health.
We found heavy metals, organic solvents and a variety of harmful chemicals that may well cause permanent nerve damage, kidney damage and all kinds of trouble.
They produce pesticide-grade, not veterinarian grade.
I can only discourage you strongly to try Chinese Lufenuron, except when you will be able to work with a trusted supplier who will produce small special batches for you at a much higher price.
You would have to do comprehensive testing on each delivery and some deliveries may still fail the test.
Best regards,