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What is it?

Iron is a mineral. Most of the iron in the body is found in the hemoglobin of red blood cells and in the myoglobin of muscle cells. Iron is needed for transporting oxygen and carbon dioxide. It also has other important roles in the body.

People take iron supplements for preventing and treating low levels of iron (iron deficiency) and the resulting iron deficiency anemia. In people with iron deficiency anemia, the red blood cells can’t carry enough oxygen to the body because they don’t have enough iron. People with this condition often feel very tired.

Iron is also used for improving athletic performance and treating attention deficit-hyperactivity disorder (ADHD) and canker sores. Some people also use iron for Crohn's disease, depression, fatigue, and the inability to get pregnant.

Women sometimes take iron supplements to make up for iron lost in heavy menstrual periods. Iron-rich foods, such as pork, ham, chicken, fish, beans, and especially beef, liver, and lamb are also used.

How effective is it?

Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, Ineffective, and Insufficient Evidence to Rate.

The effectiveness ratings for IRON are as follows:

Effective for...

  • Anemia caused by chronic disease. Many diseases such as cancer, kidney problems, or heart problems can cause anemia. Taking iron along with other medications such as epoetin alfa (erythropoietin, EPO, Epogen, Procrit) can help build red blood cells and reverse anemia in people with kidney problems or being treated for cancer with chemotherapy. Receiving iron intravenously (by IV) is more effective than taking supplements by mouth.
  • Iron deficiency. Taking iron supplements is effective for treating and preventing iron deficiency and anemia caused by too little iron in the body.
  • Coughs caused by ACE inhibitors. Medications used for high blood pressure called ACE inhibitors can sometimes cause coughing as a side effect. Some research shows that taking an iron supplement might reduce or prevent this side effect. The ACE inhibitor medications include captopril (Capoten), enalapril (Vasotec), lisinopril (Prinivil, Zestril), and many others.
  • Learning problems. Taking iron might help improve thinking, learning, and memory in children with low levels of iron.
  • Iron deficiency during pregnancy. Taking iron might reduce the risk of anemia caused by too little iron in the body when taken by women who are pregnant.

Possibly effective for...

  • Coughs caused by ACE inhibitors. Medications used for high blood pressure called ACE inhibitors can sometimes cause coughing as a side effect. Some research shows that taking an iron supplement might reduce or prevent this side effect. The ACE inhibitor medications include captopril (Capoten), enalapril (Vasotec), lisinopril (Prinivil, Zestril), and many others.
  • Learning problems. Taking iron might help improve thinking, learning, and memory in children with low levels of iron.
  • Heart failure. Up to 20% of people who have heart failure also have low levels of iron in the body. Some research shows that giving iron intravenously can improve some symptoms of heart failure. It is not yet known if taking an iron supplement by mouth would help.
  • Iron deficiency during pregnancy. Taking iron might reduce the risk of anemia caused by too little iron in the body when taken by women who are pregnant.

Insufficient evidence to rate effectiveness for...

  • Attention deficit-hyperactivity disorder (ADHD). Developing research shows that taking iron sulfate (an iron-containing chemical compound) improves some measures of attention deficit-hyperactivity disorder (ADHD) in children with iron deficiency after 1-3 months of treatment.
  • Breath-holding attacks. Early research suggests that taking iron by mouth or through a shot reduces the frequency of breath-holding attacks in children.
  • Child development. Early research shows that iron does not improve mental performance in infants and children who do not have anemia. However, there might be an improvement in the development of motor skills such as coordination.
  • Fatigue. There is some early evidence that iron supplements might improve unexplained fatigue in non-anemic women.
  • Child growth. Early evidence suggests that taking iron supplements alone by mouth does not increase growth in children.
  • Physical performance. Early research suggests that taking iron supplements or eating foods enriched with iron daily for 1-2 months decreases the heart rates of running children.
  • Canker sores.
  • A digestive tract disease called Crohn's disease.
  • Depression.
  • Female infertility.
  • Heavy menstrual bleeding.
  • Restless leg syndrome.
  • Other conditions.
More evidence is needed to rate iron for these uses.

How does it work?

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Iron helps red blood cells deliver oxygen from the lungs to cells all over the body. Once the oxygen is delivered, iron then helps red blood cells carry carbon dioxide waste back to the lungs to be exhaled. Iron also plays a role in many important chemical reactions in the body.

Are there safety concerns?

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Iron is LIKELY SAFE for most people when it is taken by mouth in appropriate amounts. However, it can cause side effects including stomach upset and pain, constipation or diarrhea, nausea, and vomiting. Taking iron supplements with food seems to reduce some of these side effects. However, food can also reduce how well the body absorbed iron. Iron should be taken on an empty stomach if possible. If it causes too many side effects, it can be taken with food. Try to avoid taking it with foods containing dairy products, coffee, tea, or cereals.

There are many forms of iron products such as ferrous sulfate, ferrous gluconate, ferrous fumarate, and others. Some products, such as those containing polysaccharide-iron complex (Niferex-150, etc), claim to cause fewer side effects than others. But there is no reliable evidence to support this claim.

Some enteric coated or controlled release iron products might reduce nausea for some people; however, these products also have less absorption by the body.

Liquid iron supplements may blacken teeth.

High doses of iron are LIKELY UNSAFE, especially for children. Iron is the most common cause of poisoning deaths in children. Doses as low as 60 mg/kg can be fatal. Iron poisoning can cause many serious problems including stomach and intestinal distress, liver failure, dangerously low blood pressure, and death. If you suspect an adult or child has taken more than the recommended amount of iron, call your healthcare professional or the nearest poison control center immediately.

There is some concern that high intake of iron might increase the chance of developing heart disease. Some studies show that people with high intake of iron, especially from food sources such as red meat, are more likely to have heart disease. This may be especially true for people with type 2 diabetes. But this is controversial. Other studies do not show that iron increases the chance of heart disease. It is too soon to tell for sure if iron increases the chance of heart disease.

Special precautions & warnings:

Pregnancy and breast-feeding: Iron is LIKELY SAFE for pregnant and breast-feeding women who have enough iron stored in their bodies when used in doses below the tolerable upper intake level (UL) of 45 mg per day of elemental iron. The UL is the highest level of intake at which no harmful side effects are expected. However, iron is LIKELY UNSAFE when taken by mouth in high doses. If you do not have iron deficiency, do not take more than 45 mg per day of elemental iron per day. Higher doses frequently cause stomach and intestinal side effects such as nausea and vomiting. High levels of hemoglobin at the time of delivery are associated with bad pregnancy outcomes. Hemoglobin is the molecule in red blood cells that contains iron.

Diabetes: There is concern that a diet that is high in iron might increase the risk of heart disease in women with type 2 diabetes, although this has not been proven. If you have diabetes, discuss your iron intake with your healthcare provider.

Stomach or intestinal ulcers: Iron might cause irritation and make these conditions worse. Use iron with care.

Intestinal inflammation, such as ulcerative colitis or Crohn’s disease: Iron might cause irritation and make these conditions worse. Use iron with care.

Hemoglobin disease, such as thalassemia: Taking iron might cause iron overload in people with these conditions. If you have a hemoglobin disease, don’t take iron unless directed to do so by your healthcare provider.

Premature infants: Giving iron to premature infants with low blood levels of vitamin E can cause serious problems. The vitamin E deficiency should be corrected before giving iron. Talk with your healthcare provider before giving iron to a premature infant.

Are there interactions with medications?

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Be cautious with this combination.

Antibiotics (Quinolone antibiotics)
Iron might decrease how much antibiotic the body absorbs. Taking iron along with some antibiotics might decrease the effectiveness of these antibiotics. To avoid this interaction take iron two hours before or two hours after taking antibiotics.

Some of these antibiotics that might interact with iron include ciprofloxacin (Cipro), enoxacin (Penetrex), norfloxacin (Chibroxin, Noroxin), sparfloxacin (Zagam), trovafloxacin (Trovan), and grepafloxacin (Raxar).

Antibiotics (Tetracycline antibiotics)
Iron can attach to tetracycline antibiotics in the stomach and decrease how much tetracycline antibiotics the body can absorb. Taking iron along with tetracycline antibiotics might decrease the effectiveness of tetracycline antibiotics. To avoid this interaction take iron two hours before or four hours after taking tetracyclines.

Some tetracycline antibiotics include demeclocycline (Declomycin), minocycline (Minocin), and tetracycline (Achromycin).

Iron can decrease how much bisphosphonate the body absorbs. Taking iron along with bisphosphonate can decrease the effectiveness of bisphosphonate. To avoid this interaction take bisphosphonate at least two hours before iron or later in the day.

Some bisphosphonates include alendronate (Fosamax), etidronate (Didronel), risedronate (Actonel), tiludronate (Skelid), and others.

Iron might decrease how much levodopa the body absorbs. Taking iron along with levodopa might decrease the effectiveness of levodopa. Do not take iron and levodopa at the same time.

Levothyroxine is used for low thyroid function. Iron can decrease how much levothyroxine the body absorbs. Taking iron along with levothyroxine might decrease the effectiveness of levothyroxine.

Some brands that contain levothyroxine include Armour Thyroid, Eltroxin, Estre, Euthyrox, Levo-T, Levothroid, Levoxyl, Synthroid, Unithroid, and others.

Methyldopa (Aldomet)
Iron can decrease how much methyldopa (Aldomet) the body absorbs. Taking iron along with methyldopa (Aldomet) might decrease the effectiveness of methyldopa (Aldomet). To prevent this interaction take iron at least two hours before or after taking methyldopa (Aldomet).

Mycophenolate mofetil (CellCept)
It is unclear how iron supplements might affect the body's absorption of mycophenolate mofetil. It has been suggested that iron might decrease how much mycophenolate mofetil (CellCept) the body absorbs. Therefore, taking iron along with mycophenolate mofetil (CellCept) might decrease the effectiveness of mycophenolate mofetil (CellCept). However, not all research has found that iron affects the body's absorption of mycophenolate. Therefore, it is not clear if this potential interaction is a serious concern. Until more is known, you should take iron at least four to six hours before, or two hours after taking mycophenolate mofetil (CellCept).

Penicillamine (Cuprimine, Depen)
Penicillamine is used for Wilson's disease and rheumatoid arthritis. Iron might decrease how much penicillamine your body absorbs and decrease the effectiveness of penicillamine. To avoid this interaction take iron two hours before or two hours after taking penicillamine.


Be watchful with this combination.

Iron is important for producing new blood cells. Chloramphenicol might decrease new blood cells. Taking chloramphenicol for a long time might decrease the effects of iron on new blood cells. But most people only take chloramphenicol for a short time so this interaction isn't a big problem.

Are there interactions with herbs and supplements?

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Acacia forms an insoluble gel with some forms of iron. It isn't known whether this leads to a significant interaction when the two are ingested together.

Beta-carotene may help the body take in (absorb) iron from iron-fortified wheat and corn flour, and rice. But taking extra beta-carotene probably wouldn't make much difference in iron absorption unless levels of beta-carotene are too low.

Calcium makes it harder for the body to absorb iron either from food or supplements. However, in people who have enough stored iron, this probably isn't a problem. However, if you are iron deficient or might become iron deficient, minimize this interaction by separating your intake of calcium and iron. Don't take calcium supplements at mealtime or when you take iron supplements.

Taking riboflavin supplements may improve the way iron supplements work in some people with anemia. However, this effect is probably significant only in people with low levels of riboflavin.

Soy protein seems to reduce the body's ability to take in iron. If you are iron deficient, choose fermented soy products. They seem to interfere with iron absorption less. However, the real importance of the interaction between soy and iron has not been determined.

Vitamin A
Vitamin A appears to be involved in moving iron from where it is stored in the body to red blood cells developing in the bone marrow. There, iron is used to build hemoglobin, the molecule in red blood cells that carries oxygen. Giving vitamin A supplements seems to improve iron levels in people whose iron levels are too low. Developing research suggests that vitamin A and beta-carotene may improve iron absorption from iron-fortified wheat and corn flour, and rice. It's unlikely that giving vitamin A supplements would have significant effects on iron status in people who have enough vitamin A to start with.

Vitamin C
Taking vitamin C and iron together helps the body absorb the iron. It doesn't matter whether the vitamin C comes from food or a supplement. However, taking a vitamin C supplement to improve absorption of iron probably isn't necessary for most people, especially if their diet contains plenty of vitamin C.

Under some circumstances iron can interfere with how the body absorbs zinc, and vice versa. However, food stops the interaction. To get maximum benefit from zinc or iron supplements, it's a good idea to take them with food.

Are there interactions with foods?

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Coffee and tea
Taking iron supplements with coffee or tea can reduce the amount of iron the body absorbs. These beverages can even reduce the amount of iron the body absorbs from food. These effects might contribute to iron deficiency anemia, especially in people with other risk factors.

Dairy products
Calcium in dairy products such as milk and cheese can reduce the absorption of iron from food and supplements. This probably isn't a problem for people who have enough iron stored in their bodies. However, if you need iron, take iron supplements with a meal that is relatively low in dairy products whenever possible. People may say you'll get the best absorption of iron on an empty stomach, but this increases the risk of stomach irritation. Don't risk it. You're better off taking iron with a low-calcium meal.

Taking iron with food can decrease how much iron is absorbed by the body by 40% to 50%. For best absorption, iron should be taken on an empty stomach. However, some people may not be able to tolerate this due to side effects such as upset stomach or nausea. If iron needs to be taken with food to reduce side effects, avoid dairy foods, coffee, tea, or cereals.

What dose is used?

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The following doses have been studied in scientific research:

  • Iron-deficiency in adults: 50-100 mg elemental iron three times daily. Doses between 30-120 mg weekly have been used in adult women. For treating children with iron deficiency anemia: the dose is 4-6 mg/kg per day divided into three doses. For both adults and children, 2-3 months of treatment can reverse anemia but might not rebuild the body’s supply of stored iron. Therefore, treatment is usually continued another 6 months to build up the body’s iron reserves.
  • For preventing iron deficiency in children, the American Academy of Pediatrics recommends iron supplements for some groups. For breast-fed infants, elemental iron 1 mg/kg/day is recommended from ages 4-6 months. Infants from 6-12 months should get 11 mg/day from food or supplements. For pre-term infants, 2 mg/kg/day for the first year is recommended. This should be continued until the baby is switched to formula or otherwise getting enough iron from food sources. Formula-fed children get enough iron from infant formula. Toddlers aged 1-3 years usually get enough iron from foods to meet the recommended daily amount of 7 mg/day; however, a supplement can be added if needed.
  • For improving learning and thinking skills in iron-deficient adolescents: 650 mg ferrous sulfate twice daily.
  • For cough caused by ACE inhibitors: 256 mg ferrous sulfate daily.
The adequate intake (AI) of iron for infants 6 months of age and less is 0.27 mg/day. For older infants and children, the recommended daily allowances (RDAs) for iron are: Infants 7 to 12 months, 11 mg/day; children 1 to 3 years, 7 mg/day; 4 to 8 years, 10 mg/day; 9 to 13 years, 8 mg/day; boys 14 to 18 years, 11 mg/day; girls 14 to 18 years, 15 mg/day. For adults, the RDA for iron is 8 mg/day for men ages 19 and older, and women ages 51 and older. For women 19 to 50 years, the RDA is 18 mg/day. For pregnant women, the RDA is 27 mg/day. For breast-feeding women, the RDA is 10 mg/day for ages 14 to 18 years, and 9 mg/day for ages 19 to 50.

Tolerable Upper Intake Levels (UL), the highest intake at which no unwanted side effects are expected, for iron are: infants and children birth to age 13, 40 mg/day; people age 14 and older (including pregnancy and breastfeeding), 45 mg/day. UL recommendations do not apply to people under medical supervision for iron deficiency.

There are many forms of iron supplements which contain different amounts of elemental iron: 1 gram of ferrous gluconate = 120 mg elemental iron (12% iron); 1 gram of ferrous sulfate = 200 mg elemental iron (20% iron); 1 gram of ferrous fumarate = 330 mg elemental iron (33% iron). The effectiveness and side effects are similar for these different forms when used in equal doses of elemental iron.

Other names

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Atomic Number 26, Carbonate de Fer Anhydre, Citrate de Fer, Elemental Iron, Fe, Fer, Fer Élémentaire, Ferric Orthophosphate, Ferrous Carbonate Anhydrous, Ferrous Citrate, Ferrous Fumarate, Ferrous Gluconate, Ferrous Pyrophosphate, Ferrous Sulfate, Ferrum Phosphoricum, Fumarate de Fer, Gluconate de Fer, Glycérophosphate de Fer, Heme Iron Polypeptide, Hierro, Iron Glycerophosphate, Orthophosphate de Fer, Orthophosphate Ferrique, Numéro Atomique 26, Polypeptide de Fer de Heme, Pyrophosphate de Fer, Sulfate de Fer.


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To learn more about how this article was written, please see the Natural Medicines Comprehensive Database methodology.methodology (


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To see all references for the Iron page, please go to

  1. Osman M. A., Patel R. B., Schuna A., Sundstrom W. R., Welling P. G. Reduction in oral penicillamine absorption by food, antacid, and ferrous sulfate. Clin Pharmacol Ther 1983;33:465-470. View abstract.
  2. Lorenz M., Wolzt M., Weigel G., Puttinger H., Hörl W. H., Födinger M., Speiser W., Sunder-Plassmann G. Ferrous sulfate does not affect mycophenolic acid pharmacokinetics in kidney transplant patients. Am J Kidney Dis 2004;43:1098-1103. View abstract.
  3. Ducray P. S., Banken L., Gerber M., Boutouyrie B., Zandt H. Absence of an interaction between iron and mycophenolate mofetil absorption. Br J Clin Pharmacol 2006;62:492-495. View abstract.
  4. Gelone D. K., Park J. M., Lake K. D. Lack of an effect of oral iron administration on mycophenolic acid pharmacokinetics in stable renal transplant recipients. Pharmacotherapy 2007;27:1272-1278. View abstract.
  5. Morii M., Ueno K., Ogawa A., Kato R., Yoshimura H., Wada K., Hashimoto H., Takada M., Tanaka K., Nakatani T., Shibakawa M. Impairment of mycophenolate mofetil absorption by iron ion. Clin Pharmacol Ther 2000;68:613-616. View abstract.
  6. Campbell N. R., Campbell R. R., Hasinoff B. B. Ferrous sulfate reduces methyldopa absorption: methyldopa: iron complex formation as a likely mechanism. Clin Invest Med 1990;13:329-332. View abstract.
  7. Davidsson L., Adou P., Zeder C., Walczyk T., Hurrell R. The effect of retinyl palmitate added to iron-fortified maize porridge on erythrocyte incorporation of iron in African children with vitamin A deficiency. Br J Nutr 2003;90:337-343. View abstract.
  8. Ahmed F., Khan M. R., Jackson A. A. Concomitant supplemental vitamin A enhances the response to weekly supplemental iron and folic acid in anemic teenagers in urban Bangladesh. Am J Clin Nutr 2001;74:108-115. View abstract.
  9. Gera T., Sachdev H. P., Nestel P. Effect of iron supplementation on physical performance in children and adolescents: systematic review of randomized controlled trials. Indian Pediatr 2007;44:15-24. View abstract.
  10. Sachdev H., Gera T., Nestel P. Effect of iron supplementation on physical growth in children: systematic review of randomised controlled trials. Public Health Nutr 2006;9:904-920. View abstract.
  1. Ramakrishnan U., Nguyen P., Martorell R. Effects of micronutrients on growth of children under 5 y of age: meta-analyses of single and multiple nutrient interventions. Am J Clin Nutr 2009;89:191-203. View abstract.
  2. Ramakrishnan U., Aburto N., McCabe G., Martorell R. Multimicronutrient interventions but not vitamin a or iron interventions alone improve child growth: results of 3 meta-analyses. J Nutr 2004;134:2592-2602. View abstract.
  3. Sachdev H., Gera T., Nestel P. Effect of iron supplementation on mental and motor development in children: systematic review of randomised controlled trials. Public Health Nutr 2005;8:117-132. View abstract.
  4. Szajewska H., Ruszczynski M., Chmielewska A. Effects of iron supplementation in nonanemic pregnant women, infants, and young children on the mental performance and psychomotor development of children: a systematic review of randomized controlled trials. Am J Clin Nutr 2010;91:1684-1690. View abstract.
  5. Zehetner A. A., Orr N., Buckmaster A., Williams K., Wheeler D. M. Iron supplementation for breath-holding attacks in children. Cochrane Database Syst Rev 2010;:CD008132. View abstract.
  6. Reveiz L., Gyte G. M., Cuervo L. G. Treatments for iron-deficiency anaemia in pregnancy. Cochrane Database Syst Rev 2007;:CD003094. View abstract.
  7. Sloan N. L., Jordan E., Winikoff B. Effects of iron supplementation on maternal hematologic status in pregnancy. Am J Public Health 2002;92:288-293. View abstract.
  8. Peña-Rosas J. P., Viteri, F. E. Effects and safety of preventive oral iron or iron+folic acid supplementation for women during pregnancy. Cochrane Database Syst Rev 2009;:CD004736. View abstract.
  9. Falkingham M., Abdelhamid A., Curtis P., Fairweather-Tait S., Dye L., Hooper L. The effects of oral iron supplementation on cognition in older children and adults: a systematic review and meta-analysis. Nutr J 2010;9:4. View abstract.
  10. Toblli J. E., Brignoli, R. Iron(III)-hydroxide polymaltose complex in iron deficiency anemia / review and meta-analysis. Arzneimittelforschung 2007;57(6A):431-438. View abstract.
  11. Wang B., Zhan S., Xia Y., Lee L. Effect of sodium iron ethylenediaminetetra-acetate (NaFeEDTA) on haemoglobin and serum ferritin in iron-deficient populations: a systematic review and meta-analysis of randomised and quasi-randomised controlled trials. Br J Nutr 2008;100:1169-1178. View abstract.
  12. Iannotti L. L., Tielsch J. M., Black M. M., Black R. E. Iron supplementation in early childhood: health benefits and risks. Am J Clin Nutr 2006;84:1261-1276. View abstract.
  13. Gera T., Sachdev H. P., Nestel P., and Sachdev S. S. Effect of iron supplementation on haemoglobin response in children: systematic review of randomised controlled trials. J Pediatr Gastroenterol Nutr 2007;44:468-486. View abstract.
  14. Gillespie R. S., Wolf, F. M. Intravenous iron therapy in pediatric hemodialysis patients: a meta-analysis. Pediatr Nephrol 2004;19:662-666. View abstract.
  15. Rozen-Zvi B., Gafter-Gvili A., Paul M., Leibovici L., Shpilberg O., Gafter, U. Intravenous versus oral iron supplementation for the treatment of anemia in CKD: systematic review and meta-analysis. Am J Kidney Dis 2008;52:897-906. View abstract.
  16. Pashos C. L., Larholt K., Fraser K. A., McKenzie R. S., Senbetta M., Piech, C. T. Outcomes of erythropoiesis-stimulating agents in cancer patients with chemotherapy-induced anemia. Support Care Cancer 2012:20:159-65. View abstract.
  17. Kozlovskaia L. V., Milovanov IuS, Nikolaev Alu, Milovanova, Llu. [Erythropoetin and iron preparations in the treatment of anemia in patients with chronic kidney disease of stage III-IV in systemic diseases]. Ter Arkh 2007;79:30-34. View abstract.
  18. Tran T., Wax J. R., Philput C., Steinfeld J. D., Ingardia C. J. Intentional iron overdose in pregnancy--management and outcome. J Emerg Med 2000;18:225-228. View abstract.
  19. Singhi SC, Baranwal AK, M J. Acute iron poisoning: clinical picture, intensive care needs and outcome. Indian Pediatr 2003;40:1177-1182. View abstract.
  20. Fernandez-Gaxiola AC, De-Regil LM. Intermittent iron supplementation for reducing anaemia and its associated impairments in menstruating women. Cochrane Database Syst Rev 2011:CD009218. View abstract.
  21. Comparison of oral iron supplements. Pharmacist's Letter / Prescriber's Letter 2008;24:240811.
  22. Iron replacement in heart failure. Pharmacist's Letter / Prescriber's Letter 2010;26:260177.
  23. Anker SD, Comin Colet J, Filippatos G, et al. Ferric carboxymaltose in patients with heart failure and iron deficiency. N Engl J Med 2009;361:2436-48. View abstract.
  24. Killip S, Bennett JM, Chambers MD. Iron deficiency anemia. Am Fam Physician 2007;75:671-8. View abstract.
  25. Baker RD, Greer FR; Committee on Nutrition. Diagnosis and prevention of iron deficiency and iron-deficiency anemia in infants and young children (0-3 years of age). Pediatrics 2010;126:1040-50. View abstract.
  26. Iron for infants and toddlers. Pharmacist's Letter / Prescriber's Letter 2010:26;261108.
  27. Konofal E, Lecendreux M. Deron J, et al. Effects of iron supplementation on attention deficit hyperactivity disorder in children. Pediatr Neurol 2008;38:20-6. View abstract.
  28. van der A DL, Peeters PH, Grobbee DE, et al. Dietary haem iron and coronary heart disease in women. Eur Heart J 2005;26:257-62. View abstract.
  29. Lee DH, Folsom AR, Jacobs DR Jr. Iron, zinc, and alcohol consumption and mortality from cardiovascular diseases: the Iowa Women's Health Study. Am J Clin Nutr 2005;81:787-91. View abstract.
  30. Kiechl S, Willeit J, Egger G, et al. Body iron stores and the risk of carotid atherosclerosis: prospective results from the Bruneck study. Circulation 1997;96:3300-07. View abstract.
  31. Qi L, van Dam RM, Rexrode K, Hu FB. Heme iron from diet as a risk factor for coronary heart disease in women with type 2 diabetes. Diabetes Care 2007;30:101-6. View abstract.
  32. Verdon F, Burnand B, Stubi CL, et al. Iron supplementation for unexplained fatigue in non-anaemic women: double blind randomised placebo controlled trial. BMJ 2003;326:1124. View abstract.
  33. Konofal E, Lecendreux M, Arnulf I, Mouren MC. Iron deficiency in children with Attention-Deficit/Hyperactivity Disorder. Arch Pediatr Adolesc Med 2004;158:1113-15. View abstract.
  34. Beard J. Iron deficiency alters brain development and functioning. J Nutr 2003;133:1468S-72S.. View abstract.
  35. Cantilena LR, Klaassen CD. The effect of chelating agents on the excretion of endogenous metals. Toxicol Appl Pharmacol 1982;63:344-50. View abstract.
  36. Lynch SR. Interaction of iron with other nutrients. Nutr Rev 1997;55:102-10.. View abstract.
  37. Dietze F, Bruschke G. Inhibition of iron absorption by pancreatic extracts (letter). Lancet 1970;1:424. View abstract.
  38. Solomons NW, Jacob RA. Studies on the bioavailability of zinc in humans: effects of heme and nonheme iron on the absorption of zinc. Am J Clin Nutr 1981;34:475-82.. View abstract.
  39. Donangelo CM, Woodhouse LR, King SM, et al. Supplemental zinc lowers measures of iron status in young women with low iron reserves. J Nutr 2002;132:1860-4.. View abstract.
  40. O'Brien KO, Zavaleta N, Caulfield LE, et al. Influence of prenatal iron and zinc supplements on supplemental iron absorption, red blood cell iron incorporation, and iron status in pregnant Peruvian women. Am J Clin Nutr 1999;69:509-15.. View abstract.
  41. Rossander-Hulten L, Brune M, Sandstrom B, et al. Competitive inhibition of iron absorption by manganese and zinc in humans. Am J Clin Nutr 1991;54:152-6.. View abstract.
  42. Crofton RW, Gvozdanovic D, Gvozdanovic S, et al. Inorganic zinc and the intestinal absorption of ferrous iron. Am J Clin Nutr 1989;50:141-4.. View abstract.
  43. Valberg LS, Flanagan PR, Chamberlain MJ. Effects of iron, tin, and copper on zinc absorption in humans. Am J Clin Nutr 1984;40:536-41.. View abstract.
  44. Stewart CA, Termanini B, Sutliff VE, et al. Iron absorption in patients with Zollinger-Ellison Syndrome treated with long-term gastric acid antisecretory therapy. Aliment Pharmacol Ther 1988;12:83-98.. View abstract.
  45. Zempsky WT, Rosenstein BJ, Carroll JA, Oski FA. Effect of pancreatic enzyme supplements on iron absorption. Am J Dis Child 1989;143:969-72.. View abstract.
  46. Package insert for Paser granules. Jacobus Pharmaceutical Co., Inc. Princeton, NJ. July 1996.
  47. Hallberg L, Hulthen L. Prediction of dietary iron absorption: an algorithm for calculating absorption and bioavailability of dietary iron. Am J Clin Nutr 2000;71:1147-60.. View abstract.
  48. Cook JD, Reddy MB. Effect of ascorbic acid intake on nonheme-iron absorption from a complete diet. Am J Clin Nutr 2001;73:93-8.. View abstract.
  49. Fleming DJ, Jacques PF, Dallal GE, et al. Dietary determinants of iron stores in a free-living elderly population: The Framingham Heart Study. Am J Clin Nutr 1998;67:722-33.. View abstract.
  50. Cook JD. Food iron availability: back to the basics. Am J Clin Nutr 1998;67:593-4. View abstract.
  51. Garcia-Casal MN, Layrisse M, Solano L, et al. Vitamin A and beta-carotene can improve nonheme iron absorption from rice, wheat and corn by humans. J Nutr 1998;128:646-50.. View abstract.
  52. Campbell NRC, Hasinoff BB, Stalts H, et al. Ferrous sulfate reduces thyroxine efficacy in patients with hypothyroidism. Ann Int Med 1992;117:1010-3.. View abstract.
  53. Campbell NRC, Hasinoff B. Ferrous sulfate reduces levodopa bioavailability: Chelation as a possible mechanism. Clin Pharmacol Ther 1989;45:220-5.. View abstract.
  54. Watkins DW, Khalafi R, Cassidy MM, Vahouny GV. Alterations in calcium, magnesium, iron, and zinc metabolism by dietary cholestyramine. Dig Dis Sci 1985;30:477-82.. View abstract.
  55. Danesh J, Appleby P. Coronary heart disease and iron status: Meta-analyses of prospective studies. Circulation 1999;99:852-4.. View abstract.
  56. Sempos CT, Looker AC, Gillum RF, Makuc DM. Body iron stores and the risk of coronary heart disease. N Engl J Med 1994;330:1119-24.. View abstract.
  57. Aronow WS. Serum ferritin is not a risk factor for coronary artery disease in men and women aged > or = 62 years. Am J Cardiol 1993;72:347-8. View abstract.
  58. Stampfer MJ, Grodstein F, Rosenberg I, et al. A prospective study of plasma ferritin and risk of myocardial infarction in US physicians (abstract). Circulation 1993;87:688.
  59. Ascherio A, Willett WC, Rimm EB, et al. Dietary iron intake and risk of coronary disease among men. Circulation 1994;89:969-74.. View abstract.
  60. Salonen JT, Nyyssonen K, Korpela H, et al. High stored iron levels are associated with excess risk of myocardial infarction in Eastern Finnish men. Circulation 1992;86:803-11.. View abstract.
  61. Tuomainen TP, Punnonen K, Nyyssonen K, Salonen JT. Association between body iron stores and the risk of acute myocardial infarction in men. Circulation 1998;97:1461-6.. View abstract.
  62. Sempos CT. Do body iron stores increase the risk of developing coronary heart disease? (commentary). Am J Clin Nutr 2002;76:501-3. View abstract.
  63. Schumann K, Borch-Iohnsen B, Hentze MW, Marx JJ. Tolerable upper intakes for dietary iron set by the US Food and Nutrition Board (commentary). Am J Clin Nutr 2002;76:499-500. View abstract.
  64. Heath AL, Skeaff CM, O'Brien SM, et al. Can dietary treatment of non-anemic iron deficiency improve iron status? J Am Coll Nutr 2001;20:477-85.. View abstract.
  65. Patterson AJ, Brown WJ, Roberts DC, Seldon MR. Diteray treatment of iron deficiency in women of childbearing age. Am J Clin Nutr 2001;74:650-6.. View abstract.
  66. Fishman SM, Christian P, West KP. The role of vitamins in the prevention and control of anaemia. Public Health Nutr 2000;3:125-50.. View abstract.
  67. Morck TA, Lynch SR, Cook JD. Inhibition of food iron absorption by coffee. Am J Clin Nutr 1983;37:416-20.. View abstract.
  68. Skikne BS, Lynch SR, Cook JD. Role of gastric acid in food iron absorption. Gastroenterology 1981;81:1068-71. View abstract.
  69. Hallberg L, Rossander-Hulten L, Brune M, Gleerup A. Calcium and iron absorption: mechanism of action and clinical importance. Eur J Clin Nutr 1992;46:317-27.. View abstract.
  70. Davidsson L, Almgren A, Sandstrom B, Hurrell RF. Zinc absorption in adult humans: the effect of iron fortification. Br J Nutr 1995;74:417-25.. View abstract.
  71. O'Brien KO, Zavaleta N, Caulfield LE, et al. Prenatal iron supplements impair zinc absorption in pregnant Peruvian women. J Nutr 2000 130:2251-5.. View abstract.
  72. Koop H, Bachem MG. Serum iron, ferritin, and vitamin B12 during prolonged omeprazole therapy. J Clin Gastroenterol 1992;14:288-92.. View abstract.
  73. Campbell N, Paddock V, Sundaram R. Alteration of methyldopa absorption, metabolism, and blood pressure control by ferrous sulfate and ferrous gluconate. Clin Pharmacol Ther 1988;43:381-6.. View abstract.
  74. Hallberg L. Does calcium interfere with iron absorption? Am J Clin Nutr 1998;68:3-4. View abstract.
  75. Lee SC, Park SW, Kim DK, et al. Iron supplementation inhibits cough associated with ACE inhibitors. Hypertension 2001;38:166-170. View abstract.
  76. Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss. AREDS report no. 8. Arch Ophthalmol 2001;119:1417-36. View abstract.
  77. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: National Academy Press, 2002. Available at:
  78. Lynch SR, Dassenko SA, Cook JD, et al. Inhibitory effect of a soybean-protein--related moiety on iron absorption in humans. Am J Clin Nutr 1994;60:567-72. View abstract.
  79. Iron chefs get nutritional boost cooking vegetables. American Chemical Society website. Available at: (Accessed 6 April 2000).
  80. Neuvonen PJ, Pentikainen PJ, Gothoni G. Inhibition of iron absorption by tetracycline [letter]. Br J Clin Pharmacol 1975;2:94-6. View abstract.
  81. Leyden JJ. Absorption of minocycline hydrochloride and tetracycline hydrochloride. Effect of food, milk, and iron. J Am Acad Dermatol 1985;12(2 Pt 1):308-12. View abstract.
  82. Aymard JP, Aymard B, Netter P, et al. Haematological adverse effects of histamine H2-receptor antagonists. Med Toxicol Adverse Drug Exp 1988;3:430-48. View abstract.
  83. Termanini B, Gibril F, Sutliff VE, et al. Effect of long-term gastric acid suppressive therapy on serum vitamin B12 levels in patients with Zollinger-Ellison syndrome. Am J Med 1998;104:422-30. View abstract.
  84. Murry JJ, Healy MD. Drug-mineral interactions: a new responsibility for the hospital dietician. J Am Diet Assoc 1991;91:66-73. View abstract.
  85. Tatro DS, ed. Drug Interactions Facts. Facts and Comparisons Inc., St. Louis, MO. 1999.
  86. Hansten PD, Horn JR. Drug Interactions Analysis and Management. Vancouver, WA: Applied Therapeutics Inc., 1997 and updates.
  87. Lomaestro BM, Bailie GR. Absorption interactions with fluoroquinolones. 1995 update. Drug Saf 1995;12:314-33. View abstract.
  88. Kalkwarf HJ, Harrast SD. Effects of calcium supplementation and lactation on iron status. Am J Clin Nutr 1998;67:1244-9. View abstract.
  89. Sokoll LJ, Dawson-Hughes B. Calcium supplementation and plasma ferritin concentrations in premenopausal women. Am J Clin Nutr 1992;56:1045-8. View abstract.
  90. Minihane AM, Fairweather-Tait SJ. Effect of calcium supplementation on daily nonheme-iron absorption and long-term iron status. Am J Clin Nutr 1998;68:96-102. View abstract.
  91. Klipstein-Grobusch K, Grobbee DE, den Breeijen JH, et al. Dietary iron and risk of myocardial infarction in the Rotterdam Study. Am J Epidemiol 1999;149:421-8. View abstract.
  92. Soewondo S. The effect of iron deficiency and mental stimulation on Indonesian children's cognitive performance and development. Kobe J Med Sci 1995;41:1-17. View abstract.
  93. Rehman A, Collis CS, Yang M, et al. The effects of iron and vitamin C co-supplementation on oxidative damage to DNA in healthy volunteers. Biochem Biophys Res Comm 1998;246:293-8. View abstract.
  94. Schumann K, Elsenhans B, Maurer A. Iron supplementation. J Trace Elem Med Biol 1998;12:129-40. View abstract.
  95. Lund EK, Wharf SG, Fairweather-Tait SJ, Johnson IT. Oral ferrous sulfate supplements increase the free radical-generating capacity of feces from healthy volunteers. Am J Clin Nutr 1999;69:250-5. View abstract.
  96. Reunanen A, Takkunen H, Knekt P, et al. Body iron stores, dietary iron intake and coronary heart disease mortality. J Intern Med 1995;238:223-30. View abstract.
  97. Ullen H, Augustsson K, Gustavsson C, Steineck G. Supplementary iron intake and risk of cancer: reversed causality? Cancer Lett 1997;114:215-6. View abstract.
  98. Corti MC, Guralnik JM, Salive ME, et al. Serum iron level, coronary artery disease, and all-cause mortality in older men and women. Am J Cardiol 1997;79:120-7. View abstract.
  99. Bruner AB, Joffe A, Duggan AK, et al. Randomized study of cognitive effects of iron supplementation in non- anaemic iron-deficient adolescent girls. Lancet 1996;348:992-6. View abstract.
  100. Sever Y, Ashkenazi A, Tyano S, Weizman A. Iron treatment in children with attention deficit hyperactivity disorder. A preliminary report. Neuropsychobiology 1997;35:178-80. View abstract.
  101. Sowade O, Messinger D, Franke W, et al. The estimation of efficacy of oral iron supplementation during treatment with epoetin beta (recombinant human erythropoietin) in patients undergoing cardiac surgery. Eur J Haematol 1998;60:252-9. View abstract.
  102. Fudin R, Jaichenko J, Shostak A, et al. Correction of uremic iron deficiency anemia in hemodialyzed patients: a prospective study. Nephron 1998;79:299-305. View abstract.
  103. Brolin RE, Gorman JH, Gorman RC, et al. Prophylactic iron supplementation after Roux-en-Y gastric bypass: a prospective, double-blind, randomized study. Arch Surg 1998;133:740-4. View abstract.
  104. Silva J, Andrade S, Ventura H, et al. Iron supplementation in haemodialysis-practical clinical guidelines. Nephrol Dial Transplant 1998;13:2572-7. View abstract.
  105. Carnielli VP, Da Riol R, Montini G. Iron supplementation enhances response to high doses of recombinant human erythropoietin in preterm infants. Arch Dis Child Fetal Neonatal Ed 1998;79:F44-8. View abstract.
  106. Hughes CG. Oral PABA and vitiligo. J Am Acad Dermatol 1983;9:770.
  107. Shils M, Olson A, Shike M. Modern Nutrition in Health and Disease. 8th ed. Philadelphia, PA: Lea and Febiger, 1994.
  108. Whitney E, Cataldo CB, Rolfes SR, eds. Understanding Normal and Clinical Nutrition. Belmont, CA: Wadsworth, 1998.
  109. Gennaro A. Remington: The Science and Practice of Pharmacy. 19th ed. Lippincott: Williams & Wilkins, 1996.
  110. McKevoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  111. Martindale W. Martindale the Extra Pharmacopoeia. Pharmaceutical Press, 1999.
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