First of all, if the iron in the wok has been oxidized into trivalent iron, and the human body needs divalent iron, trivalent iron is not easily absorbed by the human body, which is toxic and harmful to the body. These are what we often call wrought iron. If it is a pot made of wrought iron, not only can it not supplement iron, but it is also toxic. But if it is bivalent iron, that is, pig iron, which we often say, it can still play a role in supplementing iron. Therefore, iron can be supplemented by buying cast iron pots, but we must pay attention to buying pig iron. Recommend the cast iron pot in Veloson, Germany. They are made of sea salt pig iron from Hiddensai Island, which can supplement iron.