Lactoferrin Dosage Guide: 100–300 mg Evidence-Based Protocol

Expert Summary

Lactoferrin clinical trial doses span 100 mg/day (infant supplementation) to 6,000 mg/day (MRSA decolonization research), with the most common adult therapeutic range being 200–300 mg/day for immune and gut health indications and 500–1,000 mg/day for antiviral applications. No dose-response relationship has been formally characterized across the full range for aging-relevant outcomes.

Key Facts

• 100 mg/day: Used in some neonatal supplementation and general maintenance dosing. Provides baseline lactoferrin exposure; may be insufficient for therapeutic immune effects in adults.
• 200 mg/day (general recommendation): The most common dose in adult human studies for general immune function, gut health, and anti-inflammatory effects. This is the recommended starting dose for most adults.
• 300 mg/day: Used in iron deficiency anemia studies and some anti-aging protocols. More complete gut-associated lymphoid tissue (GALT) exposure; appropriate for individuals with specific immune or iron challenges.
• 500–1,000 mg/day: Used in COVID-19 clinical trials (Campione 2021: 1,000 mg/day in active infection). For prevention, 500 mg/day. For acute infection treatment, 1,000 mg/day in divided doses.
• Dose adjustment by body weight: Clinical trial dosing is typically fixed (not weight-adjusted). The standard adult therapeutic range (200–300 mg/day) applies regardless of body weight within the typical adult range.
• Timing: Fasted administration (30–60 min before meals) provides the most consistent delivery to gut mucosa with lactoferrin receptor access. With meals also shows bioactivity but with higher variability.

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Frequently Asked Questions

Should I take lactoferrin in one dose or split it?

Single daily dose (200 mg) is used in most trials. For doses of 300+ mg/day, splitting into 2 doses (morning + evening) may improve mucosal exposure continuity. No clear evidence favors splitting vs single dosing at 200 mg.

Can I take more than 300 mg/day?

Doses up to 600 mg/day are well-tolerated in clinical studies. For specific applications (active infection, aggressive immune support), 500–1,000 mg/day is clinically studied. Above 300 mg/day, GI side effects (mild bloating, loose stools) become more common.

Scientific References

• Campione E et al. Lactoferrin against SARS-CoV-2. Frontiers in Pharmacology. 2021. PMID: 34220505
• Paesano R et al. Lactoferrin in anemia treatment. International Journal of Immunopathology and Pharmacology. 2010. PMID: 20646353