Outcome
    Moderate Evidence

    Vitamin D for Hormonal Balance

    Despite vitamin D receptors appearing throughout endocrine tissue, supplementation has not been shown to normalise sex or thyroid hormones in humans.

    Overview

    Despite vitamin D receptors appearing throughout endocrine tissue, supplementation has not been shown to normalise sex or thyroid hormones in humans.

    Verdict

    Insufficient evidence

    How It Works

    Vitamin D receptors are expressed in the pituitary, ovaries, testes and thyroid, and calcitriol influences steroidogenic gene expression in vitro.

    Dosing & Protocol

    Typical dose

    Recommended dose
    Studied at 2,000-4,000 IU/day for testosterone and reproductive hormones; effects have not replicated
    Expected timeframe
    Not established

    Protocol

    form
    Vitamin D3 (cholecalciferol) with a fat-containing meal
    duration
    Trials ran 3-12 months
    co factor
    Evidence is insufficient. Vitamin D receptors are present in the testis, ovary, pituitary and placenta, and observational studies associate higher 25(OH)D with higher testosterone in men and better ovulatory function in women, which generated substantial interest. The intervention evidence has not followed: Pilz and colleagues reported a testosterone increase with 3,332 IU/day in a small trial, but larger and better-controlled trials including work by Lerchbaum found no effect on testosterone in men with normal or low levels. Results in PCOS and thyroid parameters are similarly inconsistent.
    titration
    Not applicable for this outcome; 4,000 IU/day is the tolerable upper intake level
    starting dose
    Not established for hormonal outcomes. Trials used 2,000-4,000 IU/day of vitamin D3

    Evidence

    What the studies say

    Observational studies link low vitamin D to lower testosterone and PCOS features, but randomised trials of supplementation show little to no hormonal change. Correcting deficiency is defensible; hormonal rebalancing is not an evidenced claim.

    No studies are yet linked to both Vitamin D and Hormonal Balance.

    Safety

    Caveats

    Hormonal balance is a marketing phrase rather than a clinical concept - hormones are measured individually, in specific conditions, at appropriate times of day or menstrual cycle, and interpreted against symptoms. Genuine endocrine problems have specific diagnoses and specific treatments: hypogonadism, PCOS, thyroid disease, hyperprolactinaemia and menopause each require proper assessment, and symptoms such as absent periods, unexplained galactorrhoea, marked libido loss, erectile dysfunction, hot flushes or unexplained weight change warrant testing rather than supplements. Correcting documented vitamin D deficiency is worthwhile independently but should not be expected to shift hormone levels. Safety of vitamin D: the tolerable upper intake level is 4,000 IU/day for adults, and sustained higher doses cause hypercalcaemia with nausea, vomiting, thirst, confusion, kidney stones and kidney injury. Thiazide diuretics raise hypercalcaemia risk; corticosteroids, orlistat, cholestyramine and some anticonvulsants lower vitamin D levels. Supplementation is hazardous in sarcoidosis, tuberculosis, lymphoma and primary hyperparathyroidism. In pregnancy 400-1,000 IU/day is standard and high doses are not advised.

    Less likely to help if

    Everyone - the larger trials found no hormonal effect.

    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.