It is safe to use cast iron utensils as long as you exercise some caution. Cast iron utensils have a number of health benefits. It is believed that food reacts with the metal surface of cast iron utensils, as a result of which the food becomes iron-rich. Studies have shown that cooking various foods in iron pots increases their iron content. However, it is advisable to just use iron cookware two to three times each week at most, and not every day, especially if anyone has a chance of iron overload.