Condition
    Moderate Evidence
    Effectiveness 2/5

    Vitamin D for Stroke Recovery

    Low vitamin D is common after stroke because of reduced sun exposure and predicts worse outcomes, but supplementing has not been shown to improve recovery.

    Overview

    Low vitamin D is common after stroke because of reduced sun exposure and predicts worse outcomes, but supplementing has not been shown to improve recovery.

    Verdict

    Insufficient evidence

    Insufficient evidence for recovery; correct deficiency for bone and fall-risk reasons.

    How It Works

    Vitamin D supports muscle function and bone mineralisation, both of which matter during immobility, and low status is associated with proximal muscle weakness.

    Dosing & Protocol

    Typical dose

    Recommended dose
    800-2000 IU daily, or as directed to correct deficiency
    Expected timeframe
    8-12 weeks to normalise 25(OH)D

    Protocol

    form
    Vitamin D3 (cholecalciferol) with a fat-containing meal
    duration
    Long-term as supportive care
    co factor
    Evidence is insufficient for neurological recovery. Observational studies link low vitamin D at admission to worse functional outcomes, and small trials have given 300,000 IU or 2000 IU/day post-stroke, but no adequately powered randomised trial shows improved motor or functional recovery. The defensible reason to supplement is different: stroke survivors have high rates of deficiency, immobility-related bone loss and falls, and vitamin D with calcium reduces fracture risk in that setting.
    titration
    Check 25-hydroxyvitamin D and target 75-125 nmol/L
    starting dose
    Not applicable as a recovery treatment; 800-2000 IU (20-50 mcg) daily is reasonable for bone and falls protection after stroke

    Evidence

    What the studies say

    Observational studies consistently find that stroke survivors with low 25-hydroxyvitamin D have worse functional outcomes, but this largely reflects reverse causation: people with severe stroke are indoors, immobile, and eating poorly. Randomised trials of supplementation have not demonstrated improved motor recovery or reduced disability. Where vitamin D does earn its place is fracture prevention: stroke survivors have accelerated bone loss on the hemiparetic side and a substantially elevated falls rate, and deficiency correction combined with adequate calcium and resistance work is standard supportive care. Test rather than guess, and avoid large intermittent bolus doses, which increased falls in trial settings.

    New Insight into the Role of Vitamin D in the Stroke Risk: A Meta-Analysis of Stratified Data by 25(OH)D Levels

    Score: 5/10
    2025
    meta_analysis

    Fusaro M, De Caterina R, Tripepi G

    an original meta-analysis stratified by population mean levels of 25(OH)D

    View source

    Safety

    Caveats

    Avoid high-dose annual or monthly boluses, which have increased falls. Caution in sarcoidosis, hyperparathyroidism, and hypercalcaemia.

    Less likely to help if

    People with already-replete vitamin D status will see no functional recovery benefit.

    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.