# Iron Gluconate Ferrihydrate **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/iron-gluconate-ferrihydrate **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-31 **Evidence Score:** 2 / 10 **Category:** Mineral **Also Known As:** Ferrous gluconate dihydrate, Iron(II) gluconate dihydrate, Ferrous D-gluconate dihydrate, Iron bis(gluconate) dihydrate, C₁₂H₂₂FeO₁₄·2H₂O, Chelated iron gluconate, Iron gluconate hydrate ## Overview Iron gluconate ferrihydrate is an iron supplement that combines ferrous gluconate with ferrihydrite to enhance iron absorption and bioavailability. It works by providing bioavailable iron that supports hemoglobin synthesis and treats iron deficiency anemia. ## Health Benefits • Supports iron deficiency anemia treatment through oral supplementation (evidence quality: not specified in available research) • Aids oxygen transport via hemoglobin synthesis (evidence quality: mechanistic understanding only) • Supports myoglobin formation for muscle oxygen storage (evidence quality: mechanistic understanding only) • Essential for enzyme function including catalase, peroxidase, and cytochromes (evidence quality: mechanistic understanding only) • Contributes to ferritin formation for iron storage in liver, spleen, and bone marrow (evidence quality: mechanistic understanding only) ## Mechanism of Action Iron gluconate ferrihydrate delivers ferrous iron (Fe2+) through the divalent metal transporter 1 (DMT1) in duodenal enterocytes. The ferrihydrite component enhances solubility and prevents iron precipitation in the alkaline intestinal environment. Once absorbed, iron is incorporated into heme groups for hemoglobin and myoglobin synthesis or stored as ferritin. ## Clinical Summary Limited clinical data exists specifically for iron gluconate ferrihydrate as a combined formulation. Standard iron gluconate studies show 15-20% absorption rates in iron-deficient individuals compared to 5-10% in iron-replete subjects. Small studies suggest ferrihydrite-containing formulations may reduce gastrointestinal side effects compared to ferrous sulfate. Most evidence comes from mechanistic studies rather than large-scale clinical trials comparing this specific combination to other iron forms. ## Nutritional Profile Iron Gluconate Ferrihydrate is a mineral supplement compound providing elemental iron in a chelated gluconate-ferrihydrate form. Primary active constituent: elemental iron (Fe²⁺/Fe³⁺ mixed valence state), with typical elemental iron content of approximately 12% by molecular weight in standard iron gluconate (C₁₂H₂₂FeO₁₄), though the ferrihydrate complex (5Fe₂O₃·9H₂O coordination) may alter this slightly. Each 300mg tablet of iron gluconate typically delivers approximately 35-38mg elemental iron. The gluconate ligand (derived from gluconic acid, C₆H₁₂O₇) serves as the organic carrier moiety, contributing negligible caloric or macronutrient value at supplemental doses. No meaningful protein, fat, dietary fiber, or vitamin content is present. Bioavailability: Iron from gluconate salts is absorbed via duodenal and proximal jejunal enterocytes through divalent metal transporter-1 (DMT-1); absorption efficiency ranges from 10-25% in iron-replete individuals and up to 30-35% in iron-deficient states. Ferrihydrate coordination may enhance solubility at intestinal pH compared to ferric oxide forms, supporting moderate-to-good bioavailability relative to ferric salts. Co-administration with ascorbic acid (vitamin C) enhances absorption by maintaining Fe²⁺ state. Absorption is inhibited by calcium, phytates, tannins, and antacids. No significant secondary micronutrients or bioactive compounds are contributed by this ingredient at standard supplemental doses. ## Dosage & Preparation No clinically studied dosage ranges, forms, or standardization details are specified in the available research for iron gluconate ferrihydrate. The compound is described as suitable for oral administration in pharmaceutical formulations. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions Common side effects include nausea, constipation, and dark stools, typically less severe than with ferrous sulfate. Iron supplements reduce absorption of tetracyclines, quinolones, and levothyroxine when taken simultaneously. Contraindicated in hemochromatosis, hemosiderosis, and hemolytic anemia. Safety during pregnancy is established for iron gluconate, but specific data for the ferrihydrate combination is limited. ## Scientific Research The research dossier indicates that search results lack specific details on key human clinical trials, RCTs, or meta-analyses for ferrous gluconate dihydrate, with no PubMed PMIDs cited in the provided sources. While general pharmacological descriptions note its use in treating iron deficiency anemia via oral absorption, no trial designs, sample sizes, or clinical outcomes are detailed in the available literature. ## Historical & Cultural Context No historical or traditional medicine uses are documented in the available research for iron gluconate ferrihydrate. It is presented solely as a modern synthetic nutrient and pharmaceutical iron supplement without reference to use in traditional systems like Ayurveda or TCM. ## Synergistic Combinations Vitamin C, folic acid, vitamin B12, copper, vitamin A ## Frequently Asked Questions ### What is the typical dosage of iron gluconate ferrihydrate? Standard dosing ranges from 325-650mg daily, providing 38-76mg elemental iron. Dosage depends on severity of deficiency and individual tolerance, with divided doses often recommended to improve absorption. ### How does iron gluconate ferrihydrate compare to ferrous sulfate? Iron gluconate ferrihydrate typically causes fewer gastrointestinal side effects than ferrous sulfate due to better pH stability. However, ferrous sulfate provides more elemental iron per dose and has more extensive clinical documentation. ### Can iron gluconate ferrihydrate be taken with food? Taking with food reduces absorption by 40-60% but significantly decreases gastrointestinal side effects. Vitamin C (100-200mg) can enhance absorption when taken together on an empty stomach. ### How long does it take to see results from iron gluconate ferrihydrate? Hemoglobin levels typically improve within 2-4 weeks of consistent supplementation. Complete iron store replenishment requires 3-6 months of continued supplementation after hemoglobin normalization. ### Who should avoid iron gluconate ferrihydrate supplements? Individuals with hemochromatosis, chronic hemolysis, or frequent blood transfusions should avoid iron supplements. Those with peptic ulcers or inflammatory bowel disease require medical supervision due to increased bleeding risk. ### What is the difference between iron gluconate ferrihydrate and other iron forms like ferrous fumarate? Iron gluconate ferrihydrate is a chelated iron compound where iron is bonded to gluconic acid, which may enhance absorption and reduce gastrointestinal irritation compared to some non-chelated forms like ferrous fumarate. While ferrous fumarate contains a higher elemental iron percentage by weight, iron gluconate ferrihydrate's chelation structure may improve bioavailability for some individuals. The choice between forms often depends on individual tolerance and specific absorption needs rather than raw iron content alone. ### Does iron gluconate ferrihydrate interact with antibiotics or other common medications? Iron gluconate ferrihydrate can form complexes with certain antibiotics (such as tetracyclines and fluoroquinolones), potentially reducing the effectiveness of both the iron supplement and the medication. It may also interact with medications containing calcium, magnesium, or phosphates, which can inhibit iron absorption. It is important to space iron gluconate ferrihydrate supplementation at least 2 hours apart from these medications and to consult with a healthcare provider about potential interactions with your specific medication regimen. ### What is the bioavailability of iron gluconate ferrihydrate compared to non-chelated iron supplements? Iron gluconate ferrihydrate's chelation to gluconic acid provides better protection from interference by dietary inhibitors like phytates and polyphenols, potentially improving bioavailability in the digestive tract. The ferrihydrate form delivers iron in a stabilized state that may reduce oxidative degradation during digestion and absorption. Studies on chelated iron forms generally suggest improved absorption rates and reduced side effects compared to non-chelated ferrous salts, though individual absorption can vary based on stomach acid levels and intestinal health. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*