Thank you for your question, Iron is normally found in foods like red meat. In the body, iron becomes a part of your hemoglobin and myoglobin.Hemoglobin carries oxygen through your blood to tissues and organs. Myoglobin helps your muscle cells store oxygen. Multivitamins with iron are used to provide vitamins and iron that are not taken in through the diet. They are also used to treat iron or vitamin deficiencies caused by illness, pregnancy, poor nutrition, digestive disorders, and many other conditions.Never take more than the recommended dose of a multivitamin. Avoid taking any other multivitamin product within 2 hours before or after you take multivitamins with iron. Seek emergency medical attention if you think you have used too much of this medicine. An overdose of vitamins A, D, E, or K can cause serious or life-threatening side effects. Iron and other minerals contained in a multivitamin can also cause serious overdose symptoms if you take too much. Iron and certain vitamins can cause serious or life-threatening side effects if taken in large doses. Do not take more of this medicine than directed on the label or prescribed by your doctor. Ask a doctor or pharmacist if it is safe for you to take a multivitamins with iron if you have other medical conditions. Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. When taken as directed, multivitamins are not expected to cause serious side effects. Call your doctor if you have: bright red blood in your stools; or pain in your chest or throat when swallowing a tablet. Common side effects may include: constipation, diarrhea; nausea, vomiting, heartburn; stomach pain, upset stomach; black or dark-colored stools or urine; temporary staining of the teeth; headache; or unusual or unpleasant taste in your mouth. Certain foods can also make it harder for your body to absorb iron. Avoid taking this multivitamin within 1 hour before or 2 hours after eating fish, meat, liver, and whole grain or fortified breads or cereals. Do not take this medicine with milk, other dairy products, calcium supplements, or antacids that contain calcium. Calcium may make it harder for your body to absorb certain ingredients of the multivitamin. Other drugs may interact with multivitamins with iron, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using. Hope my answer was helpful. If you think it was helpful hit thanks.