# Ovotransferrin (Gallus gallus domesticus)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/ovotransferrin
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-04
**Evidence Score:** 2 / 10
**Category:** Protein
**Also Known As:** Conalbumin, Egg white transferrin, Chicken ovotransferrin, OTf, Iron-binding protein, Egg albumin transferrin

## Overview

Ovotransferrin is an iron-binding glycoprotein found in egg white that exerts [antimicrobial](/ingredients/condition/immune-support) and [antioxidant](/ingredients/condition/antioxidant) effects primarily through iron sequestration and superoxide dismutase-like activity. Its ability to chelate ferric ions (Fe³⁺) deprives bacteria, fungi, and viruses of essential iron required for growth and replication.

## Health Benefits

• Antimicrobial properties through iron sequestration - preliminary in vitro evidence only
• [Antioxidant activity](/ingredients/condition/antioxidant) via superoxide dismutase function - preliminary in vitro evidence only
• Potential antifungal effects by depriving microbes of essential iron - preliminary in vitro evidence only
• Possible antiviral activity through iron-binding mechanism - preliminary in vitro evidence only
• [Immunomodulatory](/ingredients/condition/immune-support) effects suggested - preliminary in vitro evidence only

## Mechanism of Action

Ovotransferrin binds two ferric iron (Fe³⁺) ions per molecule with high affinity, utilizing synergistic anion bicarbonate to stabilize the metal complex and deprive pathogens of bioavailable iron essential for metabolic function. It also exhibits superoxide dismutase-like activity, catalyzing the dismutation of superoxide radicals (O₂⁻) into hydrogen peroxide and molecular oxygen, reducing [oxidative stress](/ingredients/condition/antioxidant) at the cellular level. Additionally, ovotransferrin-derived peptides such as OTAP-92 disrupt microbial membrane integrity through direct electrostatic interaction with negatively charged phospholipid bilayers.

## Clinical Summary

The majority of evidence supporting ovotransferrin's bioactive properties comes from in vitro cell culture studies and animal models, with very limited randomized controlled trials in humans. In vitro studies have demonstrated inhibition of E. coli, Staphylococcus aureus, and Candida albicans growth at concentrations ranging from 0.5 to 2.0 mg/mL under iron-deficient conditions. One small human pilot study examined ovotransferrin supplementation for [immune modulation](/ingredients/condition/immune-support) but involved fewer than 50 participants and lacked sufficient statistical power to draw definitive conclusions. Overall, the clinical evidence is preliminary and insufficient to support therapeutic claims; larger, well-controlled human trials are needed.

## Nutritional Profile

Ovotransferrin is a pure glycoprotein constituent, comprising approximately 12-13% of total egg white protein by weight. Molecular weight: ~77-80 kDa. Protein content: ~95-98% by dry weight, with a complete amino acid profile including all essential amino acids - notably high in lysine (~7.2g/100g protein), leucine (~8.1g/100g protein), and arginine (~6.5g/100g protein). Carbohydrate (glycan) component: ~2-4% by weight, consisting of N-linked oligosaccharide chains (primarily high-mannose and complex-type glycans). Iron-binding capacity: each molecule binds 2 ferric iron (Fe³⁺) ions with high affinity (Ka ~10²⁰ M⁻¹ at physiological pH), meaning a single molecule can sequester up to ~1.4 µg iron per mg of protein. Contains no lipids, fiber, or significant carbohydrates beyond glycan moieties. Bioavailability: largely dependent on digestive proteolysis - gastric and pancreatic proteases cleave ovotransferrin into bioactive peptide fragments (e.g., OTAP-92, a 92-residue [antimicrobial](/ingredients/condition/immune-support) peptide); thermal processing (>60°C) denatures the protein and reduces iron-binding capacity by ~50-70% but may generate novel bioactive peptides. Caloric contribution: approximately 4 kcal/g as with standard proteins. No significant vitamin or mineral content intrinsic to the molecule itself beyond its bound iron capacity.

## Dosage & Preparation

No clinically studied dosage ranges, standardized forms, or human trial data are available for ovotransferrin supplementation. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Ovotransferrin is derived from egg white and is contraindicated in individuals with egg allergies, as it can trigger IgE-mediated hypersensitivity reactions ranging from mild urticaria to anaphylaxis. Because ovotransferrin binds iron with high affinity, concurrent use with oral iron supplements or iron-dependent medications may reduce their bioavailability, warranting a separation of at least two hours between doses. Pregnant and breastfeeding women should avoid supplemental ovotransferrin due to an absence of safety data in these populations, though dietary egg white consumption is generally considered safe. No significant drug-drug interactions have been formally documented beyond theoretical iron-chelation interference.

## Scientific Research

No human clinical trials, randomized controlled trials (RCTs), or meta-analyses were identified for ovotransferrin supplementation. Current research is limited to in vitro structural, [antimicrobial](/ingredients/condition/immune-support), and [antioxidant](/ingredients/condition/antioxidant) property studies with no PubMed PMIDs for human trials provided.

## Historical & Cultural Context

No evidence of historical or traditional medicinal use in any systems including Ayurveda or Traditional Chinese Medicine was identified. Ovotransferrin has been primarily studied for its biochemical roles in egg white rather than ethnomedicinal applications.

## Synergistic Combinations

Iron, Vitamin C, Lactoferrin, Lysozyme, Zinc

## Frequently Asked Questions

### What is ovotransferrin and how does it differ from lactoferrin?

Ovotransferrin is an iron-binding glycoprotein (approximately 77–80 kDa) derived from chicken egg white, while lactoferrin is a structurally homologous protein found in mammalian milk. Both belong to the transferrin superfamily and share roughly 50% amino acid sequence homology, but ovotransferrin has a higher isoelectric point and slightly different iron-binding kinetics, with some studies suggesting comparable or marginally superior antimicrobial peptide activity against gram-negative bacteria.

### Can ovotransferrin supplements help fight bacterial infections?

In vitro studies show ovotransferrin inhibits growth of gram-negative bacteria like E. coli and gram-positive bacteria like S. aureus primarily by sequestering the ferric iron (Fe³⁺) these organisms require for DNA synthesis and respiration. However, no adequately powered human clinical trials have confirmed these effects translate to meaningful antibacterial protection in vivo, meaning it cannot be recommended as a treatment or preventative for bacterial infections at this time.

### What is the typical dosage of ovotransferrin in supplements?

There is no clinically established or regulatory-approved dosage for ovotransferrin supplementation due to the lack of robust human trials. Commercial supplements typically provide 100–500 mg per serving, often standardized to egg white protein content, but these amounts are based on manufacturer discretion rather than evidence-based dosing studies. Until controlled trials establish safe and effective dose ranges, any supplementation should be approached cautiously and discussed with a healthcare provider.

### Is ovotransferrin safe for people with egg allergies?

No — ovotransferrin is a major egg white protein and a recognized allergen capable of triggering IgE-mediated allergic reactions in egg-sensitive individuals, including anaphylaxis in severe cases. People with diagnosed egg allergies should strictly avoid ovotransferrin-containing supplements. Even those with mild egg sensitivities should consult an allergist before considering any egg-derived supplement.

### Does ovotransferrin have antioxidant properties?

Yes, ovotransferrin demonstrates antioxidant activity in vitro through two mechanisms: its iron-chelating capacity prevents Fe²⁺/Fe³⁺-catalyzed Fenton reactions that generate highly reactive hydroxyl radicals, and specific regions of the protein exhibit superoxide dismutase-like activity that neutralizes superoxide anions (O₂⁻). These effects have been measured in cell-free assays and cell culture models, but whether oral supplementation delivers meaningful antioxidant activity systemically in humans remains undemonstrated.

### What does current clinical research show about ovotransferrin's effectiveness in humans?

Most evidence for ovotransferrin's antimicrobial, antifungal, and antiviral properties comes from in vitro (laboratory) studies, with limited human clinical trials published to date. While these preliminary findings are promising, they have not yet been replicated in large-scale human studies needed to confirm efficacy for specific health claims. More rigorous clinical research is necessary before ovotransferrin can be recommended as a proven therapeutic for infection prevention or immune support in humans.

### Is ovotransferrin safe to take with iron supplements or iron-rich medications?

Caution is advised when combining ovotransferrin with iron supplements or medications, as ovotransferrin binds iron molecules as part of its biological mechanism, potentially reducing iron bioavailability. Individuals taking iron supplements for anemia or those prescribed iron-based medications should consult a healthcare provider before adding ovotransferrin supplements. Spacing doses several hours apart may help minimize interaction risk, but professional medical guidance is recommended.

### Who would benefit most from ovotransferrin supplementation based on current evidence?

Individuals seeking general immune support or those interested in antimicrobial compounds from natural sources may consider ovotransferrin, though evidence in human populations remains limited. People with compromised immune systems, chronic infections, or those looking for alternatives to synthetic antimicrobials are the most likely target users, despite the preliminary nature of available research. However, definitive recommendations about who benefits most await larger-scale clinical trials.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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