Hi Joanne,
I would think your Exjade use will only be temporary, although it may have to be repeated from time to time to keep your iron down. With a ferritin of only 450, you probably won't need to chelate much longer, as long as the liver MRI shows no deposits. You won't be on long term high dosage, so you shouldn't have anything to worry about. Since your iron load is caused by absorption from food, I would suggest drinking tea with meals, as it helps inhibit iron absorption and is also a mild chelator. Green tea extract can also be taken as a supplement and has a stronger chelation effect than drinking tea. There is also a supplement called IP6, that is made from the bran of grains and is very safe, that is also a mild iron chelator. Avoiding citrus and other vitamin C foods with meals can also reduce how much iron is absorbed. It is better to take citrus between meals so the vitamin C in it doesn't cause more iron to be absorbed. Reducing the amount of iron naturally can help you avoid or at least prolong the periods between Exjade usage.