Types of Iron Supplements

Oral iron : There are different types of elemental iron that have different absorption. Most of these agents have side effects including constipation and GI upset that make them less tolerable by patients and most patients stop or even reduce recommended doses to try to reduce side effects. On the other hand, absorption of most of the elemental iron commercial available by the gut is altered by the food that we eat making their absorption very erratic and unreliable. 

Intravenous Iron : Iron in the intravenous form, though ensures availability of iron in body and does not depend on the guts absorption, it is however very expensive. It is also known to cause severe allergic reactions in few patients. 
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Liposomal Iron : It is a form of iron that is in the oral form that is as good as Intravenous iron, research as shown. Thus liposomal iron is currently the most superior type of iron. 

Basically, iron is transported through a liposome that is like a car that ensures that iron reaches to the intestines where the absorption of iron happens safely.    It is thus not altered by any food or by acidity in the stomach. Moreover, it doesn't have the typical side effects of elemental iron like constipation or GI upset that makes it  much more tolerated by patients with faster absorption and repletion of iron stores. ​