Today is the day we're taking Peanut in for her radioactive iodine treatment to cure her hyperthyroid condition. My biggest worry, aside from being away from her for 10+ days (it all depends on the geiger counter reading) is how the inactivity will affect her bones. Peanut is female, 13.4 years old and in good health, but I don't want her "back-sliding" as a result of the extended boarding time. Should I be adding a calcium supplement to the food we take with us for her use at the vet? And with regard to cat calcium, is there a better type? For example, for humans, plant-based is more absorbable than calcium carbonate. Any ideas on this?