Outcome
    Preliminary
    Effectiveness 3/5

    Myo-Inositol for Mood Stabilization

    Mood benefit is plausible and low risk, but the doses used in the positive trials (12-18 g daily) are far above the PCOS dose.

    Overview

    Mood benefit is plausible and low risk, but the doses used in the positive trials (12-18 g daily) are far above the PCOS dose.

    Verdict

    Mixed evidence

    Intriguing older evidence for inositol in panic disorder and OCD at very high doses, but modern replication is thin.

    How It Works

    Inositol is the precursor of phosphatidylinositol, the membrane lipid whose cleavage produces the second messengers downstream of serotonin 5-HT2 and muscarinic receptors. Lithium, an established mood stabiliser, depletes inositol — the inositol-depletion hypothesis proposed that supplementation might modulate the same signalling.

    Dosing & Protocol

    Typical dose

    Recommended dose
    PCOS-related mood benefit at 4 g; the psychiatric trials used 12-18 g daily.
    Expected timeframe
    4-6 weeks.

    Protocol

    dose
    4 g daily for general use; psychiatric protocols used 12-18 g split across the day
    form
    Myo-inositol powder
    note
    High doses commonly cause loose stools — titrate up
    timing
    Split doses
    duration
    4-6 weeks to assess

    Evidence

    What the studies say

    Small randomised crossover trials from the 1990s reported meaningful improvement in panic disorder and obsessive-compulsive symptoms with 12-18 g daily inositol, in some cases comparable to fluvoxamine. Trials in depression were less convincing, and augmentation of SSRIs showed no benefit. Modern, adequately powered replication has not been done.

    Myo-inositol in the treatment of premenstrual dysphoric disorder

    Score: 6/10
    2011
    rct

    Gianfranco C, Vittorio U, Maurizio N +3 more

    Myo-inositol reduced symptoms in women with premenstrual dysphoric disorder.

    View source

    A meta-analysis of inositol for depression and anxiety disorders

    Score: 8/10
    2014
    meta_analysis

    Mukai T, Kishi T, Matsuda Y +1 more

    Inositol was not significantly superior to placebo for depression or anxiety symptom reduction, response or remission rates.

    View source

    Safety

    Caveats

    Do not use high-dose inositol as a substitute for treatment of panic disorder, OCD or bipolar disorder. Anyone with bipolar disorder should discuss it first — mania has been reported.

    Less likely to help if

    Depression without an anxiety component showed little benefit in the available trials.

    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.