Lactoferrin, an iron-binding milk protein usually taken as a purified cow's-milk dietary supplement, is used to help resist infection, support iron status and calm inflammation. Its most consistent human support is helping antibiotics clear an ulcer-causing stomach infection; it is not a reliable replacement for iron in anemia. Overall, it is a low-risk supplement with narrow, condition-specific support rather than proven broad longevity effects. (Full Review)

Protocol

General immune support

200 mg/day

600 mg/day in higher-dose trial arms; once-daily dosing

Stomach-infection add-on

200 mg twice daily

For 7 days alongside a standard antibiotic regimen

Iron status, three approaches

100 mg twice daily

Alone, added to oral iron, or iron alone; baseline hemoglobin, ferritin and transferrin saturation guide the choice

Time to effect

Acne

2–12 weeks

Lesion counts measured across this window

Visceral fat

8 weeks

Enteric-coated lactoferrin, 300 mg/day

Infections

12 weeks

Infection outcomes measured over this period

Benefits

High: Higher Helicobacter pylori cure rates when added to antibiotics

Medium: Better tear film after cataract surgery; fewer acne lesions; less visceral fat; better cognitive scores in Alzheimer's disease; fewer gastrointestinal infections

Low: Fewer late-onset infections in premature infants; correction of iron-deficiency anemia; fewer or shorter respiratory and common infections; slower growth of precancerous colon polyps; fewer preterm births in women at risk

Speculative: Lower systemic inflammation in older adults; protection of the gut barrier; support for bone formation; longer lifespan

Contraindications

Immunoglobulin E–mediated (immediate-type) cow's-milk allergy

Hemochromatosis or other iron-overload states (theoretical)

Hemolytic anemia (theoretical)

Key Interactions

Tetracycline and fluoroquinolone antibiotics (doxycycline, ciprofloxacin): Caution (theoretical); doses separated by 2–4 hours

Levothyroxine, bisphosphonates (alendronate) and levodopa: Caution (theoretical); doses separated by at least 4 hours

Iron supplements (ferrous sulfate): Monitor; additive

Colostrum and whey protein: Monitor; additive

Intravenous iron infusions (iron sucrose): Monitor (theoretical)

Risk & Side Effects

Medium: Under-treated iron-deficiency anemia when used in place of iron

Low: Mild digestive discomfort; possible excess mortality in critically ill adults

Speculative: Immune reactions to cow's-milk protein; iron loading in iron-overload disorders

Monitoring

Marker	Target	Why
Hemoglobin	Women 12.0–15.5 g/dL; men 13.5–17.5 g/dL	Tracks anemia response
Ferritin	Women about 15–150 ng/mL; men about 30–400 ng/mL	Iron stores; use stops if above range
Transferrin saturation	20–50%	Flags iron excess; use stops if above range
Stomach-infection test (urea breath or stool antigen)	No established target; track conversion from positive to negative after therapy	Confirms cure when used with antibiotics
Cow's-milk-specific IgE	No established target; track any detectable sensitization	Identifies milk allergy before use; only with a history of milk reactions

Cadence: Baseline; hemoglobin, ferritin and transferrin saturation at 8–12 weeks, then every 6–12 months during continued use; stomach-infection retest at least four weeks after antibiotic therapy ends

Qualitative Assessment

Number and duration of colds or other infections per season
Digestive comfort (bloating, nausea, stool changes)
Energy, exercise tolerance and breathlessness, as signs of anemia response
Acne lesion counts or skin oiliness
Eye comfort and dryness

Lactoferrin for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment