A lot of the toddler vitamins don't even have iron in them. The few I've found that do, my kids won't eat. One thing I have been able to give them is colloidal minerals, which supposedly have iron in them, and comes in liquid form which is virtually tasteless in water or juice. I don't know how well the iron in colloidal minerals is absorbed, or even how much is in there... there's not a listing of milligrams or anything on the bottle I have.
mom to DS 7, DS 5 and DD 3 :