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Moderate evidenceImmunity

Lactoferrin

Lactoferrin has real evidence in two specific settings — correcting iron-deficiency anaemia with fewer GI side effects than iron salts, and a modest reduction in late-onset sepsis in preterm infants — but the general "immune booster" positioning for healthy adults is unsupported.

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What the science says

  • Iron deficiency anaemia in pregnancy Moderate evidence

    A meta-analysis of randomized trials comparing oral bovine lactoferrin with ferrous salts in pregnant women found comparable or greater increases in haemoglobin and serum ferritin, with significantly fewer gastrointestinal side effects such as constipation, nausea and epigastric pain. Trials were mostly conducted in Egypt and Italy with modest sample sizes, so the effect size should be treated as provisional.

  • Preventing sepsis in preterm infants Moderate evidence

    The 2020 Cochrane review of enteral lactoferrin supplementation in preterm infants concluded that lactoferrin probably reduces late-onset sepsis (moderate-certainty evidence) but found little or no effect on necrotising enterocolitis, mortality or neurodevelopmental outcomes. The large ELFIN trial in over 2,200 UK infants found no significant reduction in late-onset infection on its own, which tempers the pooled result.

  • Immune support and antiviral effects in healthy adults Limited evidence

    Lactoferrin binds iron away from microbes and has broad in-vitro antibacterial and antiviral activity, and small trials have reported fewer cold symptoms with lactoferrin-containing dairy fractions. No adequately powered independent RCT establishes that lactoferrin supplements reduce infections in healthy adults, and COVID-era claims went far beyond the evidence.

Dosage & safety

Studied doseIron-deficiency anaemia in adults: 100-250 mg/day of bovine lactoferrin, usually 100 mg twice daily between meals, for 4-8 weeks. Preterm infant trials used 100-200 mg/day, given under medical supervision only. Immune-support products commonly supply 200-400 mg/day. Apolactoferrin (iron-free) is the form used in most anaemia trials; take away from food for best absorption.
SafetyWell tolerated overall — the anaemia trials were largely designed around lactoferrin causing fewer GI complaints than ferrous sulfate. Mild nausea, constipation, rash or loss of appetite occur occasionally. It is derived from cow's milk, so avoid in cow's-milk protein allergy; lactose content is usually negligible but varies by product. Do not use lactoferrin in place of prescribed iron or antibiotics for diagnosed conditions without medical advice, and do not self-treat anaemia without establishing the cause. Use in preterm infants should be directed by a neonatal team, not by parents. Data in pregnancy come from anaemia trials and are reassuring at 100-200 mg/day; safety at higher doses is unknown.

How to take it

TimingSplit it into two doses, morning and afternoon.
With food?Take it between meals on an empty stomach - it is a protein and food-triggered gastric acid degrades more of it.
Worth knowingApolactoferrin, the iron-free form, is what the anaemia trials used; many immune-branded products do not say which form they contain.

Interactions

With other supplements

  • iron supplements

    Lactoferrin is an alternative route to correcting iron status, not an addition to ferrous sulfate, and taking both together adds GI side effects without clear benefit. pick one, and do not self-treat anaemia without establishing the cause

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does lactoferrin help iron deficiency anaemia?

Lactoferrin has moderate evidence in pregnancy: trials found it raised haemoglobin and ferritin at least as well as ferrous salts, with fewer side effects such as constipation and nausea. The trials were modest in size, so treat the effect size as provisional.

Does lactoferrin boost immunity in healthy adults?

The evidence is limited: lactoferrin has antibacterial and antiviral activity in vitro, but no adequately powered independent trial shows lactoferrin supplements reduce infections in healthy adults.

How should I take lactoferrin for iron deficiency?

For iron-deficiency anaemia in adults, lactoferrin is typically taken at 100-250 mg/day, usually 100 mg twice daily between meals, for 4-8 weeks. Do not self-treat anaemia without establishing its cause, and do not stack lactoferrin with iron supplements.

Scientific references

Where to buy

Double Wood Supplements, Lactoferrin, 60 Capsules (125 mg per Capsule)

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