! Jernmangel nedsætter konverteringen af T4 til T3.

! Jernmangel øger konverteringen af T4 til Reverse T3.

! Jernmangel blokerer for T3's termogene (stofskifte-øgende) egenskaber.

! Jernmangel forhindrer behandling med syntetisk T4 i at virke.

! Jernmangel defineres ved (for) lav grad af jernmætning og lav ferritin, uanset om de begge befinder sig indenfor normalområder.

! Jernmangel er krydsforbundet med selenmangel og jodmangel, derfor er genopretningen af rette jernniveau afhængig af tilsvarende genopretning af selen og jod.

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