Condition
    Limited
    Effectiveness 2/5

    Vitamin D for Psoriasis

    Vitamin D analogues applied to the skin are established psoriasis therapy. Oral supplementation has only limited trial support and is best framed as correcting deficiency.

    Overview

    Vitamin D analogues applied to the skin are established psoriasis therapy. Oral supplementation has only limited trial support and is best framed as correcting deficiency.

    Verdict

    Mixed evidence

    Topical vitamin D analogues are a mainstay of psoriasis treatment; oral vitamin D is a different question and the evidence for it is much weaker. Worth correcting a deficiency, but do not substitute a capsule for a prescribed topical.

    How It Works

    Calcitriol regulates keratinocyte proliferation and differentiation through the vitamin D receptor, slowing the hyperproliferation that produces psoriatic plaques, and it modulates T-helper 17 activity, the immune axis central to psoriasis pathogenesis. Topical analogues such as calcipotriol deliver high local concentrations to the plaque without raising systemic calcium — an advantage oral dosing cannot replicate, because reaching similar tissue levels systemically would cause hypercalcaemia.

    Dosing & Protocol

    Typical dose

    Recommended dose
    1000-2000 IU daily orally; topical calcipotriol as prescribed
    Expected timeframe
    Topical analogues act over 4-8 weeks. Any contribution from oral supplementation is slower and more subtle.

    Protocol

    form
    Oral vitamin D3 alongside prescribed topical therapy
    duration
    Ongoing, with 25(OH)D rechecked at three months
    co factor
    Continue topical calcipotriol or corticosteroid as directed; the oral dose does not replace it
    titration
    Higher repletion dosing only if 25(OH)D is measured below 30 nmol/L
    starting dose
    1000-2000 IU daily with a fat-containing meal

    Evidence

    What the studies say

    Topical calcipotriol and calcitriol have strong randomised evidence and appear in every major psoriasis guideline, particularly combined with a topical corticosteroid. Oral vitamin D is a weaker story: psoriasis patients have lower 25(OH)D on average than controls, and small trials of oral supplementation report modest PASI score improvements, but the studies are small, heterogeneous and often uncontrolled. A secondary analysis of the VITAL trial found no reduction in autoimmune skin disease incidence attributable to vitamin D. The reasonable position is that oral vitamin D is supportive where deficiency exists and is not a treatment in itself.

    Effectiveness of oral vitamin D supplementation in lessening disease severity among patients with psoriasis: A systematic review and meta-analysis of randomized controlled trials

    Score: 8/10
    2021
    meta_analysis

    Theodoridis X, Grammatikopoulou MG, Stamouli EM +5 more

    Vitamin D supplementation was effective in ameliorating the PASI score after 6 mo of intervention (mean difference [MD] = -0.92, 95% CI = -1.72 to -0.11). However, after the Hartung-Knapp adjustment, the results became non-significant.

    View source

    Effect of Vitamin D Supplementation on Psoriasis Severity in Patients With Lower-Range Serum 25-Hydroxyvitamin D Levels: A Randomized Clinical Trial

    Score: 9/10
    2023
    rct
    n=122

    Jenssen M, Furberg AS, Jorde R +2 more

    This randomized, double-blind placebo-controlled clinical trial ... Adults from the general population in Tromsø with active plaque psoriasis and 25-hydroxyvitamin D (25[OH]D) levels of less than 24 ng/mL were included.

    View source

    Oral vitamin D3 supplementation for chronic plaque psoriasis: a randomized, double-blind, placebo-controlled trial

    Score: 7/10
    2018
    rct
    n=101

    Ingram MA, Jones MB, Stonehouse W +4 more

    A direct benefit of vitamin D3 supplementation for psoriasis could not be determined.

    View source

    Safety

    Caveats

    Oral vitamin D cannot substitute for topical therapy — the concentrations needed at the plaque are unattainable systemically without causing hypercalcaemia. Do not escalate oral dosing to chase a skin effect. Psoriasis is also a systemic inflammatory disease associated with cardiometabolic and joint involvement, so it warrants proper medical management.

    Less likely to help if

    People with adequate baseline vitamin D. Moderate to severe plaque psoriasis needs phototherapy, systemic therapy or biologics, none of which a supplement replaces.

    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.