Outcome
    Limited

    Magnesium for Sex Hormone Binding Globulin

    Magnesium may slightly reduce testosterone binding, but the practical effect is small.

    Overview

    Magnesium may slightly reduce testosterone binding, but the practical effect is small.

    Verdict

    Insufficient evidence

    How It Works

    May reduce the affinity of SHBG for testosterone, modestly raising the free fraction.

    Dosing & Protocol

    Typical dose

    Recommended dose
    200-400mg/day elemental
    Expected timeframe
    8-12 weeks

    Protocol

    form
    Not applicable
    duration
    Not applicable
    co factor
    Evidence is insufficient. The claim traces to a single small study in which magnesium supplementation at 10 mg/kg/day for four weeks was associated with increased free and total testosterone in sedentary men and taekwondo athletes, combined with in vitro work suggesting magnesium may reduce the binding affinity of sex hormone binding globulin for testosterone, thereby increasing the free fraction. That in vitro finding has not been confirmed as a clinically relevant effect in humans, and no trial has measured SHBG concentration as a primary outcome of magnesium supplementation. SHBG is principally regulated by insulin, thyroid hormone, oestrogen, liver function and body fat - insulin resistance lowers it and thyrotoxicosis raises it - none of which magnesium addresses directly.
    titration
    Not applicable
    starting dose
    Not applicable as an established treatment

    Evidence

    What the studies say

    A small study in athletes and sedentary men reported increased free and total testosterone with magnesium supplementation. Independent replication is limited.

    No studies are yet linked to both Magnesium and Sex Hormone Binding Globulin.

    Safety

    Caveats

    Loose stools with oxide forms. Effect size is modest at best.

    Less likely to help if

    Everyone: no trial has demonstrated an SHBG effect.

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    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.