If you have psoriasis, it is imperative that you have your vitamin D levels tested and maintain levels in the therapeutic range of 50-70 ng/ml year-round. Vitamin D is a potent immune modulator, making it very important for the prevention of autoimmune diseases. According to one study, “vitamin D could have important immunomodulatory effects in psoriasis,” but unfortunately 80 percent of patients in winter, and 50 percent in the summer, were vitamin-D deficient. 4 Vitamin D is thought to effect psoriasis on multiple levels, including helping to regulate keratinocyte (skin cell) growth and differentiation as well as influence the immune functions of T lymphocytes and other cells. Vitamin D also inhibits cytotoxic T cells and natural killer cell activity, potentially helping to regulate skin cell growth. 5
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