I was just reading about a woman with liver issues after taking fenben for a month. Thank you for the information! I hope George gets better! I have definitely seen a reduction in tumor size on my dog using zinc so if you've never tried that, maybe that would be a good combo. My dogs eat a food that includes liver, which is high in copper, so I don't worry too much about 15 mg of extra zinc every few days. Something to look into. God bless you.