Iron is required for proper growth and development of the body and smooth bodily functions. People with iron deficiency may suffer from anemia and fatigue. However, it is vital to understand that even excess of iron through iron supplementation can be dangerous.  Never go for an iron supplement without doctor’s recommendation. This is because there are many dangers that are associated with iron supplements.

One of the most common side effects that iron supplements can have is the gastrointestinal problem. It may lead to constipation, abdominal pain and nausea.
  
You must never take concentrated iron supplement in liquid form. If the supplement is in liquid form then make it a point to make it dilute first and then consume it. This is because concentrated iron supplement liquid can lead to teeth staining.

 Iron over load can happen if the iron supplement overdose takes place. This iron overload can cause a disease called as hemochromatosis. This is a serious disease and may even lead to organ failure if not treated.

Another danger associated with iron supplementation is inflammatory bowel disease.

Some studies even indicate that iron has negative impact on the body which can cause cancer. The studies reveal that iron encourages the growth of free radicals and thus may cause some kind of cancer.