Outcome
    Moderate Evidence
    Effectiveness 3/5

    Iron for Immune Function

    Iron is essential for immune cell function, but both deficiency AND excess impair immunity. Supplementation helps only when you are actually deficient.

    Overview

    Iron is essential for immune cell function, but both deficiency AND excess impair immunity. Supplementation helps only when you are actually deficient.

    Verdict

    Mixed evidence

    Correct deficiency for immune support; do not supplement speculatively — excess iron can feed pathogens.

    How It Works

    Lymphocyte proliferation, neutrophil bacterial killing and NK cell activity all require iron. But pathogens also need iron, which is why the body sequesters it during infection.

    Dosing & Protocol

    Typical dose

    Recommended dose
    40-100 mg elemental iron on alternate days where deficiency is confirmed; iron should not be taken for immunity in replete people, and supplementation during acute infection is discouraged
    Expected timeframe
    8-12 weeks for repletion

    Protocol

    dose
    Per deficiency protocol: 25-65 mg every other day
    timing
    Away from active infections when possible
    duration
    Until ferritin replete

    Evidence

    What the studies say

    Deficiency clearly impairs immune responses and increases infection susceptibility. However, trials of iron supplementation during active infections show mixed or harmful results — context and timing matter.

    Daily iron supplementation for improving anaemia, iron status and health in menstruating women

    Score: 9/10
    2016
    meta_analysis

    Low MSY, Speedy J, Styles CE +2 more

    Daily iron supplementation raised haemoglobin and ferritin and roughly halved the risk of anaemia and iron deficiency.

    View source

    Safety

    Caveats

    Do not take high-dose iron during an active acute infection. Test ferritin before and during supplementation.

    Less likely to help if

    Iron-replete people, and anyone currently fighting an acute infection.

    Medical Disclaimer

    The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.

    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.