What is iron glycerylphosphate used for?

Iron glycerylphosphate is used as a source of elemental iron in pharmaceutical formulations, intended to support iron replenishment for processes such as hemoglobin synthesis and oxygen transport in red blood cells. However, no published clinical trials confirm its therapeutic effectiveness or compare its performance to other iron supplements like ferrous sulfate or ferrous bisglycinate.

Is iron glycerylphosphate better absorbed than ferrous sulfate?

There is currently no human pharmacokinetic data comparing the bioavailability of iron glycerylphosphate to ferrous sulfate or any other iron form. While the organic glycerophosphate ester bond may theoretically improve tolerability by reducing free ionic iron in the gut, this hypothesis has not been tested in controlled human studies.

What are the side effects of iron glycerylphosphate?

No compound-specific side effect data exists for iron glycerylphosphate from human trials. Based on the known pharmacology of iron supplementation broadly, expected side effects may include constipation, nausea, abdominal cramping, and dark-colored stools, which are dose-dependent effects common to most oral iron compounds delivering significant elemental iron loads.

Does iron glycerylphosphate interact with any medications?

As an iron-containing compound, iron glycerylphosphate is expected to share the drug interaction profile of other oral iron supplements, including reduced absorption of tetracyclines, fluoroquinolone antibiotics, levothyroxine, and bisphosphonates when taken concurrently. It is generally recommended to separate iron supplementation from these medications by at least two hours to minimize interaction risk.

Is iron glycerylphosphate safe during pregnancy?

No pregnancy-specific safety studies have been conducted on iron glycerylphosphate. Iron supplementation during pregnancy is common practice to prevent iron-deficiency anemia, but the specific compound used should be guided by a physician, as excessive iron intake carries risks including oxidative stress and potential fetal toxicity at very high doses. Only well-studied forms with established safety profiles are typically recommended for pregnant individuals.

How much iron glycerylphosphate should I take daily?

Typical iron supplementation recommendations range from 8-27 mg of elemental iron daily depending on age, sex, and health status, but specific dosing for iron glycerylphosphate formulations should follow the product label or healthcare provider guidance. The elemental iron content in iron glycerylphosphate preparations varies by formulation, so it is important to verify how much actual iron the supplement contains rather than relying on the total compound weight. Exceeding recommended daily iron intake can lead to toxicity, particularly in children and individuals with iron overload conditions.

What is the difference between iron glycerylphosphate and other iron supplements like ferrous fumarate?

Iron glycerylphosphate is a chelated iron form designed to potentially improve tolerability compared to traditional iron salts, though direct comparative clinical evidence is limited. Ferrous fumarate is a well-established iron salt form with extensive research documenting its absorption and efficacy, whereas iron glycerylphosphate lacks published human trials demonstrating superiority or equivalent bioavailability. The choice between these forms often depends on individual tolerability and product availability rather than proven performance differences.

Who should avoid taking iron glycerylphosphate supplements?

Individuals with iron overload conditions such as hemochromatosis or hemosiderosis should avoid iron glycerylphosphate unless explicitly prescribed by a physician, as supplemental iron can exacerbate these disorders. People with certain gastrointestinal conditions, active peptic ulcers, or inflammatory bowel disease may experience adverse effects and should consult a healthcare provider before use. Additionally, those taking certain medications that interact with iron or individuals with a history of iron supplement adverse reactions should seek medical guidance before using this ingredient.

Iron Glycerylphosphate

Iron glycerylphosphate is an organically bound iron compound combining ferrous or ferric iron with glycerophosphoric acid, used as an iron source in pharmaceutical formulations. It is intended to deliver elemental iron for hemoglobin synthesis and cellular oxygen transport, though clinical evidence supporting its efficacy over standard iron salts remains absent.

Category: Mineral Evidence: 2/10 Tier: Emerging

Iron Glycerylphosphate — Hermetica Encyclopedia

Origin & History

Iron glycerylphosphate (ferric glycerophosphate) is a synthetic organophosphate compound with molecular formula C₈H₁₈Fe₂O₁₂P₂, consisting of iron(III) ions complexed with glycerophosphoric acid derived from glycerol. This mineral salt in the ferric phosphate class is produced chemically rather than extracted from natural sources, appearing as a pale yellow to green solid that is sparingly soluble in water.

Historical & Cultural Context

No historical or traditional medicinal uses in any medical systems are documented in the available sources. Iron glycerylphosphate appears to be a modern synthetic compound without traditional usage history.

Health Benefits

• No clinical benefits documented - research dossier contains no human trials or clinical evidence
• Potential iron supplementation - noted as a source of iron in pharmaceutical formulations, though no efficacy data provided
• No cardiovascular benefits established - no studies referenced
• No energy or fatigue benefits proven - no clinical trials identified
• No immune support benefits verified - no research evidence available

How It Works

Iron glycerylphosphate is absorbed in the small intestine, where the glycerophosphate ester bond is cleaved to release elemental iron, which then enters the mucosal cells via divalent metal transporter 1 (DMT1). Once absorbed, ferrous iron (Fe2+) is oxidized to ferric iron (Fe3+) by hephaestin and bound to transferrin for systemic transport to bone marrow, where it is incorporated into the protoporphyrin ring to form hemoglobin. The glycerophosphate moiety may theoretically reduce gastrointestinal irritation compared to inorganic iron salts such as ferrous sulfate, though this has not been confirmed in controlled human trials.

Scientific Research

The research dossier explicitly states that no human clinical trials, RCTs, or meta-analyses for iron glycerylphosphate were found. No PubMed PMIDs, study designs, sample sizes, or clinical outcomes are available in the provided sources.

Clinical Summary

As of the current research dossier, no published human clinical trials have evaluated the efficacy, bioavailability, or safety of iron glycerylphosphate specifically in human subjects. There are no randomized controlled trials, observational studies, or pharmacokinetic studies comparing its iron bioavailability to established forms such as ferrous sulfate, ferrous bisglycinate, or ferric pyrophosphate. Its use appears limited to pharmaceutical excipient and formulation contexts, where it functions as an iron-providing ingredient without documented clinical outcome data. The overall evidence base is insufficient to make any efficacy claims, and its therapeutic role remains unestablished.

Nutritional Profile

Iron Glycerylphosphate (also known as ferric glycerophosphate, chemical formula C₃H₇FeO₆P) is an organometallic iron-phosphorus compound used historically as a pharmaceutical mineral supplement. Key constituents: • Elemental iron (Fe³⁺): approximately 15–18% by weight, providing ferric iron in a chelated organic form intended to reduce gastrointestinal irritation compared to inorganic iron salts • Phosphorus: approximately 10–12% by weight, delivered as the glycerophosphate moiety, contributing to phosphorus intake • Glycerol backbone: serves as the organic carrier, no significant caloric or macronutrient contribution at typical supplement doses • No meaningful protein, fat, carbohydrate, or fiber content as it is administered as a purified chemical compound, not a whole food • Bioavailability notes: Ferric (Fe³⁺) iron forms generally have lower bioavailability than ferrous (Fe²⁺) forms; absorption estimated at 5–15% depending on individual iron status, gastric pH, and co-ingested dietary factors (vitamin C enhances absorption, tannins/phytates inhibit it). The glycerophosphate chelation was historically believed to improve tolerability and potentially enhance absorption over simple inorganic iron salts (e.g., ferric oxide), though robust comparative bioavailability data from modern clinical trials are lacking • No vitamins, fiber, or additional bioactive compounds present • Typical historical dosage forms provided 50–300 mg of the compound per dose, equating to roughly 8–54 mg elemental iron per dose • The phosphorus component may contribute modestly to daily phosphorus requirements (RDA ~700 mg for adults), but at standard iron-supplement doses this contribution is minor (~5–36 mg phosphorus per dose) • Solubility is moderate in acidic conditions, which may facilitate gastric dissolution but remains inferior to highly soluble ferrous salts like ferrous sulfate or ferrous gluconate

Preparation & Dosage

No clinically studied dosage ranges have been established for iron glycerylphosphate. Forms, standardization details, and therapeutic doses remain unspecified in available research. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Insufficient research to determine synergistic ingredients

Safety & Interactions

Because no dedicated human safety studies exist for iron glycerylphosphate, its side effect profile is inferred from general iron supplementation data, which commonly includes constipation, nausea, dark stools, and gastrointestinal discomfort at therapeutic doses. Iron compounds broadly interact with tetracycline antibiotics, fluoroquinolones, levothyroxine, and proton pump inhibitors, which can reduce iron absorption or alter drug bioavailability when co-administered. Iron supplementation is contraindicated in hereditary hemochromatosis, hemosiderosis, and certain hemolytic anemias, and should only be used under medical supervision during pregnancy to avoid iron overload risk to the fetus. Without specific toxicology or interaction data for iron glycerylphosphate, caution and physician guidance are advised before use.