Iron ferrous
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Iron Ferrous: Insights from Recent Research
Gastrointestinal Side-Effects of Ferrous Sulfate Supplementation
Ferrous Sulfate and GI Side-Effects
Ferrous sulfate, a common oral iron supplement, is associated with significant gastrointestinal (GI) side-effects. A systematic review and meta-analysis of 43 trials involving 6831 adult participants revealed that ferrous sulfate significantly increases the risk of GI side-effects compared to placebo and intravenous (IV) iron. The odds ratio (OR) for GI side-effects was 2.32 when compared to placebo and 3.05 when compared to IV iron . This increased risk was consistent across various subgroups, including patients with inflammatory bowel disease (IBD) and pregnant women .
Comparative Efficacy in Pregnancy
In a randomized controlled trial comparing ferrous sulfate with IV iron preparations in pregnant women, ferrous sulfate was found to be less effective in improving hemoglobin (Hb) and ferritin levels. IV iron, particularly ferric carboxymaltose (FCM), showed superior efficacy and better tolerability, leading to improved quality of life (QoL) and compliance among pregnant women .
Bioavailability and Absorption of Ferrous Iron
Ferrous Sulfate vs. Other Iron Forms
Ferrous sulfate is more bioavailable than other forms of iron, such as ferrous fumarate and reduced iron with Na2EDTA, when added to fortified foods. A study involving preschoolers demonstrated that iron absorption from ferrous sulfate was significantly higher compared to these other forms, making it a more effective fortificant in addressing iron deficiency .
Ferritin vs. Ferrous Sulfate
Research comparing iron absorption from ferritin and ferrous sulfate in nonanemic women found no significant difference in bioavailability between the two. Both forms of iron were equally well absorbed, suggesting that dietary ferritin iron is a good source of iron .
Ferrous Iron Transport in Bacteria
Mechanisms of Ferrous Iron Transport
Bacteria have evolved specialized systems for the transport of ferrous iron (Fe2+), which is crucial for their survival, especially under anaerobic conditions. The Feo system, which includes the FeoB and FeoA proteins, is widely distributed among bacteria and plays a key role in ferrous iron uptake. This system is essential for maintaining iron homeostasis and contributes to bacterial virulence .
Phototrophic Ferrous Iron Oxidation
Certain anoxygenic phototrophic bacteria can oxidize ferrous iron under anaerobic conditions, using it as an electron donor for photosynthesis. This process, which does not require molecular oxygen, may have implications for understanding early Earth conditions and the formation of banded iron formations 58.
Alternative Iron Supplements
Lactoferrin vs. Ferrous Sulfate
Lactoferrin, a milk-derived iron-binding glycoprotein, has been shown to be a superior supplement to ferrous sulfate in terms of improving serum iron parameters and hemoglobin levels. Lactoferrin is better tolerated and causes fewer GI side-effects, making it a promising alternative for iron supplementation .
Ferric Citrate in CKD Patients
In patients with chronic kidney disease (CKD) and iron deficiency, ferric citrate has been found to be more effective than ferrous sulfate in increasing transferrin saturation (TSAT) and ferritin levels. This suggests that ferric citrate may be a better option for managing iron deficiency in CKD patients .
Conclusion
Ferrous sulfate remains a widely used iron supplement due to its high bioavailability, but it is associated with significant GI side-effects. Alternative iron supplements, such as lactoferrin and ferric citrate, offer promising benefits with fewer side-effects and better efficacy in specific populations. Understanding the mechanisms of ferrous iron transport and oxidation in bacteria also provides insights into potential therapeutic developments and the evolutionary history of iron metabolism.
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