Thank you both for your answers! I went ahead & picked up a container of the salt substitute. It was inexpensive, so if he can't tolerate it, it wasn't a waste of money. We've JUST paid off his hospital bill and lab bills from last year. We are still paying for the MRI & PET scans. Now the fun part begins with bills for the "chemo" (Erbitux) and radiation. So very thankful we have insurance. At least this way we can eventually pay the bills.