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    #UK health

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    Scientific illustration for Vitamin D: The Immune Regulator Britain Is Chronically Deficient In
    Immune System
    14 MIN READ

    Vitamin D: The Immune Regulator Britain Is Chronically Deficient In

    Vitamin D3 — technically a secosteroid hormone rather than a vitamin — is synthesised in the skin from 7-dehydrocholesterol upon UVB radiation exposure, converted to 25-hydroxyvitamin D in the liver, and then to the active 1,25-dihydroxyvitamin D (calcitriol) in the kidney and immune tissues, where it regulates the expression of over 2,000 genes involved in immune modulation, antimicrobial peptide production, calcium homeostasis, cancer suppression, and cardiovascular protection. An estimated 1 in 5 UK adults are deficient in vitamin D — a figure that rises dramatically in winter months and among darker-skinned individuals due to the UK's northern latitude and insufficient sunlight — creating widespread immune dysregulation, increased susceptibility to infection, elevated cancer risk, and the autoimmune conditions that optimal vitamin D status is documented to prevent. The UK government's recommendation of 400 IU daily is orders of magnitude below the therapeutic levels demonstrated in clinical research.

    #vitamin D#immune function