Hi Barb,
It's true, there is some copper in most of the BalanceIt formulas. They did just come out with a copper free version a couple of months ago. However, when I asked the nutritionists about reformulating our boy's diet to use the new version, they said the copper free version does not have taurine, which is helpful for the liver and, more importantly, that some copper is required for the body to process normally and Tucker is already at the minimum copper intake. With that information, we decided to keep him on the Feline-K version that has the lowest amount of copper of all of their formulas (before the copper free version came out) and the additional taurine.
The other thing to know about BalanceIt is it requires veterinary approval to purchase and to get dosing information for. We got Tucker's homemade diet recipe + BalanceIt prescription from PetDiets at
petdiets.com and they were great. Our vet worked with them directly, sending them all of Tucker's medical information so they could formulate his diet around all of his medical conditions (we're "lucky" enough to have more than just CAH to deal with). The reason we picked them was because our vet went to school with one of the vets there so she trusted them, which was a good enough recommendation for me. I don't remember how much it cost, as we did it a couple of years ago.
Hope that all helps Barb. Let me know if you have any other questions. Good luck!