Outcome
    Moderate Evidence
    Effectiveness 3/5

    Vitamin D for Fertility Support Female

    Vitamin D deficiency is linked to worse fertility and IVF outcomes; correcting deficiency is sensible, but supplementation beyond sufficiency has not improved pregnancy rates in trials.

    Overview

    Vitamin D deficiency is linked to worse fertility and IVF outcomes; correcting deficiency is sensible, but supplementation beyond sufficiency has not improved pregnancy rates in trials.

    Verdict

    Mixed evidence

    Test and correct deficiency; more is not better.

    How It Works

    Vitamin D receptors are expressed in ovaries, endometrium, and placenta; deficiency is associated with PCOS severity, poorer endometrial receptivity, and lower IVF success in cohorts.

    Dosing & Protocol

    Typical dose

    Recommended dose
    1,000–2,000 IU/day D3 to sufficiency
    Expected timeframe
    8–12 weeks to replete; fertility benefit tied to correcting deficiency.

    Protocol

    dose
    1,000–2,000 IU D3
    notes
    Test 25(OH)D; target 30–50 ng/mL.
    timing
    with a meal
    duration
    preconception onward

    Evidence

    What the studies say

    Cohort meta-analyses show sufficient women have higher IVF live-birth rates; however, RCTs of supplementation in replete women show no pregnancy benefit — the signal is deficiency correction.

    Antioxidants for female subfertility

    Score: 9/10
    2020
    systematic_review

    Showell MG, Mackenzie-Proctor R, Jordan V +1 more

    Investigators compared oral antioxidants, including: combinations of antioxidants, N-acetylcysteine, melatonin, L-arginine, myo-inositol, carnitine, selenium, vitamin E, vitamin B complex, vitamin C, vitamin D+calcium, CoQ10, and omega-3-polyunsaturated fatty acids versus placebo

    View source

    Safety

    Caveats

    Fat-soluble; avoid chronic >4,000 IU/day without monitoring. Often bundled in prenatals at low doses — check adequacy.

    Less likely to help if

    Women already at sufficiency.

    Medical Disclaimer

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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.