You're often dizzy or you have Headaches? Iron deficiency may be the cause. Iron is the trace element that occurs most frequently in the human organism. It is found in 71 percent of the red blood pigment (haemoglobin). Iron is essential for many processes in the body and supports the immune system. In order for these processes to function daily, there must always be sufficient iron in the body. It is therefore very important to eat a balanced diet so that the iron level always remains within the limits.