Loading...
Loading...
Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Vitamin C [EPC]
Ferrous Bisglycinate is a high-bioavailability iron amino acid chelate used to treat or prevent iron deficiency anemia. It is classified as a mineral supplement and blood-modifier agent.
Name
Ferrous Bisglycinate
Raw Name
FERROUS BISGLYCINATE
Category
Vitamin C [EPC]
Drug Count
5
Variant Count
5
Last Verified
February 17, 2026
About Ferrous Bisglycinate
Ferrous Bisglycinate is a high-bioavailability iron amino acid chelate used to treat or prevent iron deficiency anemia. It is classified as a mineral supplement and blood-modifier agent.
Detailed information about Ferrous Bisglycinate
References used for this content
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Ferrous Bisglycinate.
Healthcare providers typically prescribe Ferrous Bisglycinate for the prevention and treatment of iron deficiency anemia (a condition where the body lacks enough healthy red blood cells due to low iron). The U.S. Food and Drug Administration (FDA) has recognized Ferrous Bisglycinate as Generally Recognized as Safe (GRAS) for use in food fortification and as a dietary supplement. Its development was driven by the clinical need for an iron source that provides high systemic absorption while minimizing the significant gastrointestinal (GI) distress—such as nausea, constipation, and abdominal cramping—commonly associated with conventional iron therapy.
At the molecular level, Ferrous Bisglycinate works by providing a source of elemental iron that is essential for the production of hemoglobin, the protein in red blood cells (erythrocytes) responsible for transporting oxygen from the lungs to the body's tissues. It also serves as a critical cofactor for numerous enzymes involved in energy metabolism, DNA synthesis, and electron transport (cytochromes).
The mechanism of absorption for Ferrous Bisglycinate is distinct from inorganic iron salts. Traditional iron salts must be ionized in the stomach and then transported into the enterocytes (intestinal cells) via the Divalent Metal Transporter 1 (DMT1). This process is often inhibited by dietary factors like phytates (found in grains), polyphenols (found in tea/coffee), and calcium. In contrast, the bisglycinate chelate structure protects the iron atom from these inhibitors. Clinical evidence suggests that the chelate is absorbed intact through the dipeptide pathway or via specific amino acid transporters, after which the iron is released within the enterocyte and enters the systemic circulation through ferroportin. This 'stealth' absorption mechanism is why Ferrous Bisglycinate is often effective at lower elemental doses compared to ferrous sulfate.
Ferrous Bisglycinate is primarily used for the following indications:
Ferrous Bisglycinate is available in several oral dosage forms to accommodate different patient needs:
> Important: Only your healthcare provider can determine if Ferrous Bisglycinate is right for your specific condition. A blood test (complete blood count and ferritin level) is essential before starting therapy to avoid iron overload.
For the treatment of iron deficiency anemia, the standard adult dosage of Ferrous Bisglycinate typically ranges from 25 mg to 100 mg of elemental iron daily, often divided into two doses. For prevention of deficiency or general supplementation, a dose of 18 mg to 27 mg per day is common. Because of its high bioavailability, your healthcare provider may prescribe a lower total milligram dose of Ferrous Bisglycinate than they would if you were taking ferrous sulfate.
Pediatric dosing must be strictly supervised by a pediatrician and is usually based on the child's weight.
No specific dose adjustment is usually required for patients with renal impairment; however, these patients must be monitored closely for iron overload, especially if they are also receiving erythropoiesis-stimulating agents (ESAs).
Use with extreme caution in patients with chronic liver disease. The liver is the primary storage site for iron, and impaired function can lead to dysregulated iron homeostasis.
Elderly patients may be more prone to constipation. While Ferrous Bisglycinate is gentler, starting at the lower end of the dosing range (e.g., 25 mg) is often recommended to assess tolerance.
To achieve maximum benefit, follow these administration guidelines:
If you miss a dose, take it as soon as you remember. However, if it is nearly time for your next scheduled dose, skip the missed dose and resume your regular schedule. Do not double the dose to catch up, as this increases the risk of gastrointestinal side effects and acute toxicity.
Iron overdose is a medical emergency, particularly in children. Signs of acute overdose include:
In the event of a suspected overdose, contact a Poison Control Center or seek emergency medical attention immediately. Treatment may involve gastric lavage and the administration of a chelating agent like deferoxamine.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance. Excessive iron intake can lead to permanent organ damage.
While Ferrous Bisglycinate is formulated to be 'gastric-friendly,' some patients may still experience mild gastrointestinal effects. These are generally less severe than those caused by ferrous sulfate:
> Warning: Stop taking Ferrous Bisglycinate and call your doctor immediately if you experience any of these:
Chronic use of high-dose iron supplements without medical supervision can lead to Hemosiderosis or Hemochromatosis (iron overload). Over time, excess iron deposits in vital organs such as the liver, heart, and pancreas, potentially leading to cirrhosis, heart failure, and diabetes. Regular monitoring of serum ferritin and transferrin saturation is necessary for anyone on long-term iron therapy.
While Ferrous Bisglycinate itself does not carry a unique FDA Black Box Warning, all iron-containing supplements are required by the FDA to carry a warning regarding accidental overdose in children.
FDA Warning Text Summary: Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of reach of children. In case of accidental overdose, call a doctor or poison control center immediately.
Report any unusual symptoms to your healthcare provider. Your doctor may adjust your dose or switch you to an alternative form of iron if side effects persist.
Ferrous Bisglycinate should only be used when a clinical need for iron has been established by a healthcare professional. It is not a general 'pick-me-up' for fatigue unless that fatigue is specifically caused by iron deficiency. Taking iron when your levels are normal can be dangerous.
No specific FDA black box warnings exist for Ferrous Bisglycinate beyond the standard warning for all iron products: "Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of reach of children."
To ensure safety and efficacy, your healthcare provider will likely order the following tests periodically:
Ferrous Bisglycinate does not typically affect the central nervous system. It is considered safe to drive or operate machinery while taking this supplement, provided you do not feel dizzy or weak due to the underlying anemia.
While there is no direct chemical interaction between alcohol and Ferrous Bisglycinate, chronic excessive alcohol consumption can damage the liver and increase the risk of iron overload. Alcohol can also irritate the stomach lining, potentially worsening the GI side effects of iron.
Do not stop taking Ferrous Bisglycinate abruptly if it was prescribed for a specific deficiency, as your iron stores may not be fully replenished. Most providers recommend continuing therapy for 3 to 6 months after hemoglobin levels normalize to ensure the body's 'reserve' (ferritin) is full. There is no withdrawal syndrome associated with iron, but the anemia may return if the underlying cause (e.g., bleeding) has not been addressed.
> Important: Discuss all your medical conditions with your healthcare provider before starting Ferrous Bisglycinate.
There are no drugs that are strictly contraindicated in a 'life-threatening' sense, but Dimercaprol (a chelating agent used for lead poisoning) should not be used with iron as it can form a toxic complex that damages the kidneys.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking. The timing of your doses is often more important than avoiding the drugs entirely.
Ferrous Bisglycinate must NEVER be used in the following circumstances:
Conditions requiring careful risk-benefit analysis by a physician:
There is no known cross-sensitivity between Ferrous Bisglycinate and other drug classes. However, patients who have had a severe reaction to intravenous iron (like Iron Dextran) should be monitored closely when starting oral iron, although the mechanisms of reaction are usually different.
> Important: Your healthcare provider will evaluate your complete medical history before prescribing Ferrous Bisglycinate.
Ferrous Bisglycinate is widely considered safe and is often the preferred form of iron during pregnancy. It is frequently categorized as Pregnancy Category A (or B, depending on the specific country's guidelines), meaning studies have not shown a risk to the fetus. In fact, iron requirements increase significantly during the second and third trimesters. Ferrous Bisglycinate is often better tolerated by pregnant women who are already suffering from 'morning sickness' or pregnancy-induced constipation.
Iron is naturally present in breast milk. Supplementation with Ferrous Bisglycinate by the mother does not significantly alter the iron content of breast milk, as the body tightly regulates this. It is considered safe for nursing mothers and is often continued postpartum to help the mother recover from blood loss during delivery.
Ferrous Bisglycinate is approved for use in children and infants. It is often used in 'iron drops' for breastfed infants who may not be getting enough iron from milk alone after 4-6 months of age. Because the taste is less metallic than ferrous sulfate, it often has better compliance in children. However, the risk of fatal poisoning from accidental ingestion is highest in this group.
Older adults are at a higher risk for iron deficiency due to poor diet or occult (hidden) GI bleeding. While Ferrous Bisglycinate is effective, providers must ensure the anemia isn't a symptom of a more serious condition like colon cancer. Elderly patients should be monitored for increased constipation.
In patients with stage 3-5 Chronic Kidney Disease (CKD), the hormone hepcidin is often elevated, which blocks iron absorption. While Ferrous Bisglycinate has superior absorption, it may still be insufficient for patients on dialysis, who often require intravenous iron.
Patients with liver cirrhosis must be monitored with extreme care. Since the liver stores iron, any dysfunction can lead to rapid iron toxicity if supplements are overused.
> Important: Special populations require individualized medical assessment.
Ferrous Bisglycinate consists of one atom of ferrous iron (Fe2+) chelated by two molecules of glycine. The molecular structure forms two heterocyclic rings. This chelation prevents the iron from reacting with dietary compounds like phytates and tannins. Once in the small intestine, the chelate is likely absorbed via the dipeptide transport system. Inside the enterocyte, the glycine ligands are metabolized, and the iron is released into the intracellular iron pool. From there, it is either stored as ferritin or exported into the plasma via ferroportin to be picked up by transferrin.
The primary pharmacodynamic effect is the increase in hemoglobin synthesis. The onset of action is relatively slow; while reticulocyte (young red cell) counts may rise within 7-10 days, a significant increase in hemoglobin usually takes 2-4 weeks. Full restoration of iron stores (ferritin) may take 3-6 months of consistent therapy.
| Parameter | Value |
|---|---|
| Bioavailability | 70-90% (as chelate) |
| Protein Binding | >99% (to Transferrin) |
| Half-life | N/A (Iron is recycled) |
| Tmax | 2 - 4 hours |
| Metabolism | Ligand (Glycine) is metabolized as amino acid |
| Excretion | Desquamation, Menses, GI loss |
Ferrous Bisglycinate is a Mineral Supplement and a Hematinic. It is part of the 'Iron Amino Acid Chelate' group, which is distinguished from 'Inorganic Iron Salts' (like Ferrous Sulfate) and 'Heme Iron Polypeptides.'
Common questions about Ferrous Bisglycinate
Ferrous Bisglycinate is primarily used to treat and prevent iron deficiency anemia, a condition where the body lacks enough iron to produce sufficient hemoglobin for oxygen transport. It is also commonly used as a prenatal supplement to support the increased iron needs of both the mother and the developing fetus. Because of its high bioavailability, it is often chosen for patients who have failed to respond to traditional iron salts or those who cannot tolerate the side effects of other iron supplements. Additionally, it may be used by individuals with restrictive diets, such as vegans or vegetarians, who are at a higher risk of iron deficiency. Always consult a healthcare provider to confirm a deficiency through blood work before starting treatment.
The most common side effects include darkening of the stool, which is a harmless result of iron excretion, and mild gastrointestinal symptoms like nausea or constipation. Compared to traditional iron supplements like ferrous sulfate, Ferrous Bisglycinate is generally much better tolerated and less likely to cause significant stomach pain or cramping. Some users might experience a mild metallic taste in the mouth or occasional diarrhea as their body adjusts to the mineral. These side effects are often dose-dependent, meaning they may decrease if the dose is adjusted by a doctor. If you experience severe abdominal pain or signs of an allergic reaction, seek medical attention immediately.
There is no known direct interaction between alcohol and Ferrous Bisglycinate that would make the supplement toxic. However, alcohol can irritate the lining of the stomach and intestines, which may worsen any gastrointestinal side effects caused by the iron. Furthermore, chronic heavy alcohol use can interfere with how your body stores and uses iron, potentially increasing the risk of iron overload in the liver. It is generally best to limit alcohol consumption while treating anemia to allow your body to recover effectively. If you have a history of liver disease, you should be especially cautious and discuss alcohol use with your doctor.
Yes, Ferrous Bisglycinate is considered one of the safest and most effective forms of iron for use during pregnancy. It is often preferred by obstetricians because it is less likely to cause the nausea and constipation that are already common during pregnancy. Maintaining adequate iron levels is crucial for preventing preterm birth, low birth weight, and maternal anemia. Most prenatal vitamins now include this chelated form of iron to improve patient compliance and absorption. However, you should only take the specific dose recommended by your healthcare provider as part of your prenatal care routine.
The timeline for improvement depends on the severity of the initial iron deficiency. You may begin to feel an increase in energy levels within a week or two as the body starts producing more young red blood cells (reticulocytes). However, it typically takes 4 to 6 weeks for hemoglobin levels to show a significant increase on a blood test. To fully replenish the body's long-term iron stores, which are measured by ferritin levels, most people need to continue supplementation for 3 to 6 months. Your doctor will likely perform follow-up blood tests to determine when it is safe to stop the supplement.
You can safely stop taking Ferrous Bisglycinate without experiencing withdrawal symptoms, as it is a mineral supplement rather than a habit-forming medication. However, if you stop before your iron stores are fully replenished, your anemia is likely to return, especially if the original cause (such as heavy periods or a poor diet) is still present. It is important to complete the full course of treatment recommended by your doctor to ensure your ferritin levels are within the healthy range. If you are experiencing bothersome side effects, talk to your doctor about lowering the dose rather than stopping the supplement entirely. They can help you create a plan to maintain your iron levels through diet or other means.
If you miss a dose, take it as soon as you remember, provided it is not too close to the time for your next scheduled dose. If it is almost time for your next dose, simply skip the missed one and continue with your regular schedule. Never take two doses at the same time to make up for a missed one, as this can lead to acute stomach irritation or even iron toxicity. Consistency is key for treating anemia, but a single missed dose will not significantly set back your progress. Setting a daily reminder on your phone can help you stay on track with your treatment plan.
There is no clinical evidence to suggest that Ferrous Bisglycinate causes weight gain. Iron is a mineral used for oxygen transport and energy metabolism and does not contain calories or hormones that would affect body fat. Some patients may feel better and have an improved appetite once their anemia is treated, which could lead to slight changes in weight if their caloric intake increases. Conversely, treating iron deficiency can actually improve your ability to exercise and stay active by reducing fatigue. If you notice unusual weight changes while taking this supplement, you should discuss them with your healthcare provider to rule out other causes.
Ferrous Bisglycinate can interact with several common medications, so timing is very important. It can significantly reduce the absorption of certain antibiotics, thyroid medications (levothyroxine), and osteoporosis drugs (bisphosphonates) if taken at the same time. To avoid these interactions, it is generally recommended to space your iron supplement at least 2 to 4 hours apart from other medications. Antacids and certain calcium supplements can also block the absorption of iron. Always provide your doctor or pharmacist with a full list of all medications and herbal supplements you are taking to ensure there are no dangerous or neutralizing interactions.
Ferrous Bisglycinate is widely available both as a generic mineral supplement and under various brand names. Because it is classified as a dietary supplement in many regions, you can find it over-the-counter in pharmacies, health food stores, and online. Generic versions are generally just as effective as brand-name versions, provided they are manufactured by a reputable company that follows Good Manufacturing Practices (GMP). When buying a generic, check the label for the amount of 'elemental iron' provided, as this is the most important factor for your dosage. Your healthcare provider may recommend a specific brand or formulation based on your individual needs.