Condition
    Moderate Evidence
    Effectiveness 3/5

    Magnesium for Premenstrual Bloating

    Magnesium has specific randomised trial evidence for reducing premenstrual fluid retention — one of the better supplement options for cyclical bloating, alongside salt reduction in the premenstrual week.

    Overview

    Magnesium has specific randomised trial evidence for reducing premenstrual fluid retention — one of the better supplement options for cyclical bloating, alongside salt reduction in the premenstrual week.

    Verdict

    Mixed evidence

    How It Works

    Magnesium influences sodium-potassium balance and aldosterone activity, moderating the hormonal fluid retention of the luteal phase. It also smooths the mood and cramp symptoms that travel with premenstrual bloating.

    Dosing & Protocol

    Typical dose

    Recommended dose
    200-360 mg elemental magnesium daily (glycinate or citrate), continuously or from mid-cycle
    Expected timeframe
    2-3 cycles for a fair assessment

    Protocol

    form
    Magnesium glycinate or citrate
    duration
    Assess over three cycles
    co factor
    Trials that showed benefit for premenstrual fluid symptoms used 200-360 mg daily, often with 40-50 mg vitamin B6, dosed from ovulation to menses.
    titration
    Increase to 300-360 mg through the luteal phase if tolerated
    starting dose
    200 mg elemental magnesium daily with food, starting mid-cycle

    Evidence

    What the studies say

    Randomised trials of magnesium (200-360 mg daily) show reduced premenstrual fluid retention and bloating versus placebo, and it features in combination PMS trials with positive results. Calcium (1,200 mg) reduced bloating in a large RCT, and dietary salt reduction has direct trial support. The evidence is modest in size but consistent in direction.

    Magnesium supplementation and subjective anxiety: a systematic review

    Score: 6/10
    2017
    systematic_review

    Boyle NB, Lawton C, Dye L

    Existing evidence is suggestive of a beneficial effect of Mg on subjective anxiety in anxiety vulnerable samples. However, the quality of the existing evidence is poor.

    View source

    Herbs, vitamins and minerals in the treatment of premenstrual syndrome: a systematic review

    Score: 7/10
    2009
    systematic_review

    Whelan AM, Jurgens TM, Naylor H

    To identify herbs, vitamins and minerals advocated for the treatment of PMS and/or PMDD and to systematically review evidence from randomized controlled trials (RCTs) to determine their efficacy in reducing severity of PMS/PMDD symptoms.

    View source

    Safety

    Caveats

    Loose stools at higher doses — glycinate is gentlest. Safe for most; caution with kidney disease.

    Less likely to help if

    Women whose bloating is gastrointestinal in origin - IBS, coeliac disease or SIBO - rather than hormonal.

    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.