There are multiple experiments that have been performed by various Liver flushers that may conclude if or not LFs are effective. This is unfortunately not a simple question hence the Liver Flush Debate Forum...

Testimonial experiments
//www.curezone.org/forums/fm.asp?i=783925#i

//www.curezone.org/forums/fm.asp?i=67726#i


LF Survey is a great source of evidence too:
//www.curezone.org/faq/p/r.asp?a=28,571,2826&s=21&u=1


Success stories with results:
//www.curezone.org/forums/fm.asp?i=331385#i

//www.curezone.org/forums/fm.asp?i=676706


Hopefully this helps answer your question.