Iron supplements are often recommended whenever dietary intake of iron fails to meet the body's needs. Iron deficiency can lead to anemia and many other problems. When choosing an iron supplement, it helps to be aware that the chelated form of iron used in Twinlab's 18 mg Iron supplement is easy on your stomach and non-constipating. The stomach irritation and constipation issues are common with inorganic prescription iron supplements like ferrous sulfate. But Twinlab Iron is easy-to-absorb, easy on the system and has only a moderate potency of iron, an added safety feature since excess iron is not beneficial. Be sure to always take Twinlab Iron with solid food.