Lactoferrin

Lactoferrin is a 7.0–7.5/10 fit for immune function, gut health, anti inflammatory, especially for readers who can match the protocol to iron status, dairy allergy, infection risk, and gut barrier context. The best evidence anchors are Christofi et al. 2024, which 19 randomized trials; favored lactoferrin for hemoglobin in low-Hb populations, with very high heterogeneity and risk-of-bias concerns, and Berthon et al. 2026, which Randomized trial in 103 older adults; 600 mg/day changed virus-stimulated IL-6 and T-cell subsets, without infection-outcome proof. Lactoferrin is an iron-binding milk protein with the best evidence in low-hemoglobin states, H. That makes the intervention most useful when the reader wants the studied outcome, accepts the evidence limits, and can track whether the response shows up.

✅ Best for: Iron-deficient adults who struggle with ferrous sulfate tolerability and want a clinician-monitored, iron-adjacent option; people using lactoferrin as an adjunct to standard H. pylori eradication therapy; mild-to-moderate inflammatory acne users willing to run the lactoferrin + zinc + vitamin E stack for 8-12 weeks; older adults testing immune-marker modulation; and high-exposure users who already have gut or iron-context clues. Lactoferrin is also relevant in NICU neonatal protocols, but only under clinical supervision and with the mixed ELFIN, LIFT, Pammi, and Ariff evidence in view.

❌ Avoid if: You have cow's milk IgE allergy or Alpha-Gal Syndrome; you are pregnant or lactating and considering therapeutic-dose supplementation without clinician oversight; you have hereditary hemochromatosis or unexplained high ferritin without labs and medical context; you are an iron-replete healthy adult expecting reliable standalone respiratory infection prevention; or you would skip proven first-line care for H. pylori, anemia, acne, neonatal sepsis prevention, or infection control. Also avoid low-quality products without content verification, because underdosing is a real practical failure mode.