As always, talk to your primary care physician. I'd call the nephrologist that evaluated you at the transplant center, too. I did, on just this topic. I was satisfied that the operative word was "function". My function continues just fine, so I don't worry about this. I think the stuff I'm using has a lighter load of aluminum than some, but I think there's some, not none in it. The manufacturers keep changing formulations available for purchase so it's a moving target. Best wishes.