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An inadequate vitamin D nutritional status is associated with autoimmune diseases, heart disease, deadly types of cancer, neurological disorders and undesirable consequences in pregnancy, amongother things. In a nationally representative sample of adults in Australia on vitamin D (VitD) congestion in the general population, 20% of participants were verified to be Vit D deficient and 43% to have insufficient VitD levels . It is therefore to be welcomed that in 2020 a guideline on VitD supplementation for medical use was created, taking into consideration the opinions of various global institutions . For more than 15 years there have been reports that vitamin D (VitD) has an immunomodulatory function in multiple sclerosis (MS)  and that there is an association between low circulating serum levels of 25-hydroxyvitamin D [s25(OH)D] and an increase in inflammatory activity and impact on quality of life in persons with multiple sclerosis (PwMS)  . Nevertheless, up to the present the "neurological community" has not been able to agree to start a daily add-on therapy using an easy to carry out, inexpensive and low-side effect vitamin D supplementation (VitD suppl. from the beginning of the diagnosed MS disease or the chronically isolated syndrome (CIS). In the last decade, there has been an accumulation of evidence of immunological and pathophysiological mechanisms that VitD positively influences the course of the disease and should become an eminent factor in therapy (. For 13 years, neurologists in Sweden have been informing PwMS about the benefits of VitD-suppl. and given a recommendation for add-on therapy .
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