Don't use it every feeding like it states on the directions. Use calcium most feedings and the calcium plus once to twice a week. I would use a multivitamin once or twice a month in place of the calcium plus as well.
I and others on the forum have had issues and fatalities from overdoing it with this product.
Chameleons are extremely sensitive to vitamin buildups, there is way too much vitD3 in the product to be even considered being used more than twice a month. There are also not enough other nutrients in the product (such as amino acids and trace minerals) that it could possibly replace everything else.
This is my opinion and experience (unfortunately). I would recommend once a week maximum for the calcium plus. It is a good product, but comes with bad directions.
I disagree with several of the points that you have made here. and if there were indeed "issues and fatalities" from use of this product as you claim, I want to see a necropsy and histopathology of the tissues that proves hypervitaminosis D on animals that were using those supplement exclusively. unless you can provide several reports of that, everything else is just a guess, IMO. conversely, Allen can show you studies of thousands of lizards fed with this mix and have outperformed all of the others in the trials and have been the healthiest of the bunch. I'm not trying to belittle you here, but science is carried out a certain way and I have never seen any proof of damage from this supplement, ever. and proof doesn't come by guesses, ideas, or conversation in a forum.
but what I will say is that there is no one perfect mix for any animal, anywhere. everyone's lighting is different, nutrition, temperatures, etc. and every animal and likely species will have their own requirements as well. so no one, including me can just make blanket statements that apply to every chameleon from one in a glass aquarium in Holland to another that lives outdoors year round in San Diego. owners need to do the research on what is best and then see how their particular animal fits into that puzzle. my own dusting varies from cage to cage: is it a gravid female? a growing young male? a female who is recovering from just laying? or a 5 year old that has other health issues?
the D3 in this particular product is fairly mid-range, it comes higher or much lower. and there are several ingredients that have excellent sources of amino acids and trace minerals. for most insectivores and the way that they are kept, I think it's an excellent supplement. and for where the state of research currently is, I stand by that. in 20 years, who knows? you can't pick up a newspaper without reading an article on human nutrition that doesn't question what we all thought was correct 10 years ago, and sometimes it's dramatic enough where they completely reverse their opinion. if we can't get humans straight, how many people here really think we already know perfect chameleon nutrition?
all in all, and most everyone at least agrees on this––
use variety. that gives the best possible chance of doing something right at least some of the time. like Bill reminded me the other night, even a broken watch is correct twice daily. but I don't believe that Repashy is "broken" for most chams out there, and will continue to use it on all my kiddies.