# Iron Bisglycinate **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/iron-bisglycinate **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-18 **Evidence Score:** 8 / 10 **Category:** Mineral **Also Known As:** Ferrous bisglycinate, Iron glycinate chelate, Chelated iron, Ferrous glycinate, Iron amino acid chelate, Bisglycinated iron, Iron(II) bisglycinate ## Overview Iron bisglycinate is a chelated form of iron bound to two glycine amino acids, offering superior bioavailability compared to traditional iron salts. This chelation protects iron from gastric interference and allows for enhanced absorption through amino acid transporters in the intestinal wall. ## Health Benefits - Supports the production of red blood cells by enhancing hemoglobin synthesis. This support can prevent anemia and improve oxygen transport in the body. - Enhances energy levels by facilitating oxygen delivery to muscles and tissues. Better oxygenation can lead to increased [stamina](/ingredients/condition/energy) and reduced fatigue. - Supports [cognitive function](/ingredients/condition/cognitive) by improving oxygen supply to the brain. Enhanced brain oxygenation can lead to better focus and mental clarity. - Boosts [immune function](/ingredients/condition/immune-support) by supporting the proliferation of immune cells. A stronger immune system can better protect against infections. - Reduces [oxidative stress](/ingredients/condition/antioxidant) by participating in antioxidant enzyme production. This reduction can lower the risk of chronic diseases. - Supports healthy pregnancy by preventing iron deficiency anemia, crucial for fetal development. Adequate iron levels can lead to healthier pregnancy outcomes. - Enhances athletic performance by improving endurance and recovery. Better performance can lead to more effective workouts and fitness gains. ## Mechanism of Action Iron bisglycinate bypasses the divalent metal transporter (DMT1) pathway used by inorganic iron forms, instead utilizing peptide transporters like PEPT1 for absorption. The glycine chelation protects iron from precipitation by phytates, tannins, and calcium in the digestive tract. Once absorbed, iron is incorporated into hemoglobin synthesis and cellular [energy production](/ingredients/condition/energy) through cytochrome oxidase enzymes. ## Clinical Summary Comparative studies show iron bisglycinate demonstrates 2.3-4.6 times higher bioavailability than iron sulfate in healthy adults. Clinical trials in pregnant women (n=90-120) found bisglycinate forms increased serum ferritin levels more effectively with 50% fewer gastrointestinal side effects. Studies in iron-deficient athletes showed significant improvements in hemoglobin levels within 8-12 weeks. Evidence is strongest for bioavailability advantages, with emerging data on tolerance benefits. ## Nutritional Profile - Provides elemental iron, crucial for oxygen transport in the blood. - Highly bioavailable form, ensuring effective absorption. - Contains glycine, which aids in reducing gastrointestinal side effects. ## Dosage & Preparation Typical dosage ranges from 15 mg to 30 mg of elemental iron per day. Consult a healthcare provider before use. ## Safety & Drug Interactions Iron bisglycinate generally causes fewer gastrointestinal side effects than iron sulfate, including reduced nausea, constipation, and stomach upset. It may still interact with calcium, zinc, and tetracycline antibiotics when taken simultaneously. Contraindicated in hemochromatosis and hemosiderosis conditions. Pregnancy safety data is limited, though preliminary studies suggest good tolerance in second and third trimesters. ## Scientific Research Randomized controlled trials have shown that iron bisglycinate is effective in increasing hemoglobin levels and improving iron status with fewer side effects compared to other forms of iron. ## Historical & Cultural Context Iron has been used since ancient times to treat anemia and fatigue. The chelated form, bisglycinate, was developed to improve absorption and reduce side effects. ## Synergistic Combinations Vitamin C,Folic Acid,B12 ## Frequently Asked Questions ### How much more absorbable is iron bisglycinate than iron sulfate? Clinical studies demonstrate iron bisglycinate is 2.3 to 4.6 times more bioavailable than iron sulfate. This increased absorption is due to the glycine chelation protecting iron from dietary inhibitors and utilizing different intestinal transport mechanisms. ### What is the recommended dosage of iron bisglycinate for anemia? Typical dosing ranges from 18-25mg elemental iron daily for mild deficiency, up to 50-100mg daily for iron deficiency anemia. The chelated form requires lower doses than iron sulfate due to superior absorption, reducing the risk of gastrointestinal side effects. ### Can iron bisglycinate be taken on an empty stomach? Yes, iron bisglycinate can be taken on an empty stomach with better tolerance than iron sulfate. The glycine chelation protects against gastric irritation, though some individuals may still prefer taking it with food to minimize any potential stomach upset. ### Does iron bisglycinate interact with vitamin C absorption? Iron bisglycinate does not require vitamin C for absorption enhancement like traditional iron salts do. However, vitamin C can still provide additional absorption benefits and does not interfere with the chelated form's unique transport mechanisms. ### How long does it take to see results from iron bisglycinate supplementation? Serum iron levels typically improve within 2-4 weeks, while hemoglobin and ferritin levels show significant increases after 8-12 weeks of consistent supplementation. Energy levels and fatigue reduction may be noticed within 4-6 weeks as iron stores replenish. ### Is iron bisglycinate safe during pregnancy and breastfeeding? Iron bisglycinate is generally considered safe during pregnancy, as iron supplementation is commonly recommended to prevent anemia in pregnant women. However, dosage requirements increase during pregnancy, and you should consult your healthcare provider to determine the appropriate amount for your specific needs. It is also considered safe during breastfeeding, though iron supplementation primarily benefits the mother's health rather than directly increasing iron content in breast milk. ### Does iron bisglycinate interact with common medications like antibiotics or thyroid drugs? Iron bisglycinate can interact with certain medications, particularly tetracycline and fluoroquinolone antibiotics, as well as thyroid medications like levothyroxine, by reducing their absorption if taken simultaneously. To minimize interactions, these medications should be taken at least 2–4 hours apart from iron supplementation. If you are taking prescription medications, inform your healthcare provider before starting iron bisglycinate to ensure safe concurrent use. ### What is the difference between iron bisglycinate and other chelated iron forms? Iron bisglycinate is a chelated form where iron is bound to the amino acid glycine, which enhances absorption and reduces gastrointestinal side effects compared to non-chelated forms like iron sulfate. Other chelated forms, such as iron glycinate or iron citrate, offer similar benefits, but iron bisglycinate is particularly noted for its superior bioavailability and gentle effect on the digestive system. The chelation process protects the iron from binding with inhibitors in food, allowing for more consistent and reliable absorption. ### What is chelated iron and how does iron bisglycinate fit that definition? Chelated iron refers to iron that has been chemically bound to an organic molecule — in this case, two glycine amino acids — forming a stable ring-like structure that protects the mineral from reactive compounds in the gut. Iron bisglycinate is one of the most studied chelated iron forms because the glycine ligands shield the iron ion from binding with phytates, tannins, and calcium that would otherwise render it insoluble and unabsorbable. This chelation also allows the compound to be absorbed via peptide transporters (PEPT1) rather than relying solely on the more competitive DMT1 pathway used by inorganic iron salts. ### Is iron bisglycinate gentler on the stomach than regular iron supplements? Yes — clinical trials comparing iron bisglycinate to iron sulfate consistently report approximately 50% fewer gastrointestinal side effects, including reduced nausea, constipation, and cramping. This tolerability advantage is attributed to the chelated structure, which limits free iron ions from directly irritating the intestinal mucosa and generating reactive oxygen species in the gut lumen. The ability to achieve effective iron repletion at lower elemental iron doses — due to higher bioavailability — also contributes to the reduced GI burden. ### Can I take iron bisglycinate with food or does it need to be taken on an empty stomach? Iron bisglycinate can generally be taken with food without the significant absorption losses seen with iron sulfate, making it a practical advantage for individuals sensitive to stomach upset. Because the glycine chelate resists binding to dietary inhibitors like phytates and calcium, the relative bioavailability penalty from food co-ingestion is substantially lower than for inorganic iron salts. However, co-administration with very high-dose calcium supplements or antacids in the same meal should still be minimised as a precautionary measure. ### How long does it take for iron bisglycinate to raise ferritin and hemoglobin levels? In clinical studies of iron-deficient adults and athletes, measurable improvements in serum ferritin were typically observed within 4–6 weeks of consistent supplementation, while hemoglobin normalisation often required 8–12 weeks depending on the severity of deficiency and the dose used. Ferritin — the iron storage protein — tends to respond earlier than hemoglobin because replenishing storage pools precedes the sustained increase in red blood cell production. Individual response varies based on baseline iron status, dietary iron intake, and any underlying cause of depletion. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*