Condition
    Preliminary
    Effectiveness 2/5

    Vitamin D for Traumatic Brain Injury

    Low vitamin D is associated with worse outcomes after brain injury, but the association is confounded and supplementation has not been shown to improve recovery.

    Overview

    Low vitamin D is associated with worse outcomes after brain injury, but the association is confounded and supplementation has not been shown to improve recovery.

    Verdict

    Insufficient evidence

    Insufficient evidence for recovery; worth correcting a documented deficiency on general grounds.

    How It Works

    Vitamin D receptors are expressed throughout the central nervous system, and calcitriol influences neurotrophin expression, calcium handling in neurons, and glial inflammatory responses.

    Dosing & Protocol

    Typical dose

    Recommended dose
    800-2000 IU daily, guided by 25(OH)D testing
    Expected timeframe
    8-12 weeks to normalise 25(OH)D

    Protocol

    form
    Vitamin D3 (cholecalciferol) with a fat-containing meal if correcting deficiency
    duration
    Not established
    co factor
    Evidence is insufficient. Small studies have combined progesterone with vitamin D after traumatic brain injury and reported better outcome scores, and animal work shows neuroprotective effects, but the human trials are tiny, confounded and unreplicated - no adequately powered randomised trial supports vitamin D as a treatment. The defensible reason to supplement is that people recovering from significant brain injury are often immobile, indoors and deficient, with fracture and falls risk.
    titration
    Check 25-hydroxyvitamin D and target 75-125 nmol/L
    starting dose
    Not applicable as a treatment for brain injury

    Evidence

    What the studies say

    Observational studies report that patients with low 25-hydroxyvitamin D have worse outcomes after traumatic brain injury, and a small trial combining vitamin D with progesterone reported better outcomes than progesterone alone — but progesterone itself failed in the large ProTECT III and SyNAPSe trials, which weakens the foundation. The association between low vitamin D and poor outcome is heavily confounded: severe injury means hospitalisation, immobility and no sun exposure, all of which lower vitamin D independently of any causal role. There is no adequately powered randomised trial showing that supplementation improves neurological recovery. Where vitamin D remains worthwhile is the ordinary case: prolonged immobility after significant injury raises fracture and falls risk, and deficiency correction is standard supportive care. Test rather than assume.

    A review of the neuroprotective role of vitamin D in traumatic brain injury with implications for supplementation post-concussion

    Score: 4/10
    2016
    systematic_review
    n=5

    Lawrence DW

    VDH supplementation cannot be recommended at this time to improve outcomes following TBI.

    View source

    Safety

    Caveats

    Avoid large intermittent bolus doses, which increased falls in trials. Caution in hypercalcaemia, sarcoidosis and hyperparathyroidism.

    Less likely to help if

    People with replete vitamin D status will see no 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.