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The Role of Vitamin D in Health and Disease: A Narrative Review on the Mechanisms Linking Vitamin D with Disease and the Effects of Supplementation

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Abstract

Vitamin D insufficiency or deficiency (VDD) is a very prevalent condition in the general population. Vitamin D is necessary for optimal bone mineralization, but apart from the bone effects, preclinical and observational studies have suggested that vitamin D may have pleiotropic actions, whereas VDD has been linked to several diseases and higher all-cause mortality. Thus, supplementing vitamin D has been considered a safe and inexpensive approach to generate better health outcomes—and especially so in frail populations. Whereas it is generally accepted that prescribing of vitamin D in VDD subjects has demonstrable health benefits, most randomized clinical trials, although with design constraints, assessing the effects of vitamin D supplementation on a variety of diseases have failed to demonstrate any positive effects of vitamin D supplementation. In this narrative review, we first describe mechanisms through which vitamin D may exert an important role in the pathophysiology of the discussed disorder, and then provide studies that have addressed the impact of VDD and of vitamin D supplementation on each disorder, focusing especially on randomized clinical trials and meta-analyses. Despite there already being vast literature on the pleiotropic actions of vitamin D, future research approaches that consider and circumvent the inherent difficulties in studying the effects of vitamin D supplementation on health outcomes are needed to assess the potential beneficial effects of vitamin D. The evaluation of the whole vitamin D endocrine system, rather than only of 25-hydroxyvitamin D levels before and after treatment, use of adequate and physiologic vitamin D dosing, grouping based on the achieved vitamin D levels rather than the amount of vitamin D supplementation subjects may receive, and sufficiently long follow-up are some of the aspects that need to be carefully considered in future studies.

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Authors and Affiliations

  1. Turku PET Centre, University of Turku, Turku, Finland

    Eleni Rebelos

  2. Institute of Clinical Physiology, National Research Council (CNR), Pisa, Italy

    Eleni Rebelos

  3. 1st Department of Propaedeutic and Internal Medicine, Medical School, National and Kapodistrian University of Athens, Laiko General Hospital, Athens, Greece

    Nikolaos Tentolouris

  4. Department of Medicine, Tameside and Glossop Integrated Care NHS Foundation Trust, Ashton-under-Lyne , England

    Edward Jude

  5. University of Manchester, Manchester, UK

    Edward Jude

  6. Manchester Metropolitan University, Manchester, UK

    Edward Jude

Authors
  1. Eleni Rebelos
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  2. Nikolaos Tentolouris
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  3. Edward Jude
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ER and EJ searched the literature and drafted the manuscript. NT revised critically the text. All authors approved the final version of the text.

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Correspondence to Edward Jude.

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Edward Jude, Eleni Rebelos and Nikolaos Tentolouris declare that they have no conflicts of interest.

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Rebelos, E., Tentolouris, N. & Jude, E. The Role of Vitamin D in Health and Disease: A Narrative Review on the Mechanisms Linking Vitamin D with Disease and the Effects of Supplementation. Drugs 83, 665–685 (2023). https://doi.org/10.1007/s40265-023-01875-8

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