I don't know who your breeder is, but Vincent from Screameleons has told me to LIGHTLY dust the feeders with Rep-Cal w/ D3 (pretty much a strictly indoor cham) AND Herpavite about 3 times a week. I mix the two when I dust.
I have been told on the board here to use it less frequently.
My experience has been this:
When I originally asked about the supplement schedule, I told Vincent I was using Reptavite rather the herpavite by accident. The supplement schedule for Reptavite, he told me, was once every couple of weeks. So because of the miscommunication, I dusted with herpavite once every 2 weeks.
My panther in the last 2 weeks started exhibiting signs of vitamin a deficiency. The only thing that I didn't do correctly as far as cage, set up, temps, humidity, feeders, etc. was the vitamin schedule.
Jim from the Chameleon Company very kindly walked me through what vitamin a deficiency was and how to treat it. Vincent agreed and I treated according while going to the proper supplement schedule of Rep Cal AND Herpavite together 3 times a week.
My panther has since recovered. That is my experience. I am by no means an expert, and I'm new to this (3 months ago I got my first cham) so I'm just sharing my experience. Thats what it was like for me, though.