Cholecalciferol / Calcitriol / Sunshine Vitamin
Synthesised in skin from sunlight, Vitamin D is critical for skin barrier function, keratinocyte differentiation, immune regulation and antimicrobial defence. Deficiency is associated with eczema, psoriasis and inflammatory skin conditions. Oral supplementation supports overall skin health, immune function, mood and bone density — especially important in low-sunlight months.
Oral 1000–4000 IU/day (verify with blood test for ideal dose). Topical calcitriol is prescription only.
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