I have used Mega C and was good with my cat but it doesn't taste that great.
As for converting I know of someone who did but they were young kittens at the time so they may have thrown it off on there own. My cat thru the virus after a year but I had him on all sorts of things. But he passed away from cancer which they vet said while he was positive weakened his immune system. I don't personally think Mega C is a miracle thing but I think it helped. My cats hate it so I use Solid Gold C which is not is high in C but my cat will eat it. CArla
