Lactoferrin
Lactoferrin
Lactoferrin is a multifunctional iron-binding glycoprotein naturally found in colostrum, breast milk, saliva, tears, and other secretions. It is widely used as a supplement for immune support, iron metabolism regulation, gut health, and its antimicrobial and anti-inflammatory properties. Research has also explored its roles in reducing iron-deficiency anemia, supporting gut microbiome balance, and potential antiviral and anticancer activities.
Mechanism of Action
Lactoferrin exerts its effects primarily by binding free iron in the gut and body fluids, sequestering it away from pathogens that require iron for growth, thereby exhibiting broad-spectrum antimicrobial activity. It also directly interacts with lipopolysaccharides on bacterial membranes and binds to specific lactoferrin receptors (LfR) on epithelial and immune cells, modulating NF-κB signaling to reduce pro-inflammatory cytokine production. Additionally, it promotes intestinal iron absorption by delivering iron to enterocytes via receptor-mediated endocytosis and supports gut barrier integrity by stimulating bifidogenic bacteria.
Evidence by Health Goal(14 goals)
Dosing Protocols
On empty stomach or 30 minutes before meals for optimal absorption
Most clinical trials used 100-300mg/day. For iron-deficiency anemia support, 100mg twice daily has been studied. Bovine lactoferrin (bLf) is the most common commercial form; enteric-coated formulations may improve bioavailability. Doses up to 1g/day have been used in some research protocols without significant adverse events.
Safety & Side Effects
Lactoferrin has an excellent overall safety profile and is generally recognized as safe (GRAS) by the FDA; it is well tolerated at doses up to 1-2g/day in adults and has been studied in infants and elderly populations. Individuals with cow's milk protein allergy should avoid bovine lactoferrin, and caution is warranted in individuals with hereditary hemochromatosis due to its iron-modulating properties.
Possible Side Effects
- !Gastrointestinal discomfort including bloating or mild cramping at higher doses
- !Loose stools or mild diarrhea, particularly at doses above 600mg/day
- !Nausea, especially when taken on a full stomach at high doses
- !Skin rash or urticaria in individuals with milk protein allergies
- !Fatigue reported in rare cases during high-dose supplementation
- !Potential transient changes in stool color due to altered iron binding in the gut
Interactions
- -May reduce absorption of orally administered iron supplements or iron-containing medications if taken simultaneously — separate dosing by 2 hours
- -May enhance the antimicrobial effects of antibiotics such as amoxicillin and cefepime through synergistic membrane disruption of bacteria
- -Can potentiate anticoagulant effects indirectly by altering gut microbiome composition — use caution with warfarin and monitor INR
- -May reduce absorption of zinc and other divalent minerals due to competitive iron-binding interactions in the gut
- -Concurrent use with immunosuppressants (e.g., cyclosporine) warrants caution given lactoferrin's immune-modulating activity
Cost & Where to Buy
Cost varies significantly by purity, source (bovine vs. human recombinant), and formulation (standard vs. enteric-coated). Generic bovine lactoferrin at 100-200mg/day is widely available at the low end; pharmaceutical-grade or liposomal formulations from premium brands run higher.
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