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We set out a rationale for testing serum 25-hydroxyvitamin D concentrations and discuss our personal practice in terms of supplementation, with evidence where available.<\/jats:p>","DOI":"10.1136\/practneurol-2017-001720","type":"journal-article","created":{"date-parts":[[2017,9,25]],"date-time":"2017-09-25T20:40:20Z","timestamp":1506372020000},"page":"35-42","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":46,"title":["Vitamin D supplementation"],"prefix":"10.1136","volume":"18","author":[{"given":"Ruth","family":"Dobson","sequence":"first","affiliation":[{"name":"Department of Neurology, St George\u2019s Hospital NHS Trust, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hannah R","family":"Cock","sequence":"additional","affiliation":[{"name":"Department of Neurology, St George\u2019s Hospital NHS Trust, London, UK"},{"name":"Centre for Clinical Neurosciences, St George\u2019s University, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter","family":"Brex","sequence":"additional","affiliation":[{"name":"Department of Neurology, King\u2019s College Hospital NHS Trust, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9995-1700","authenticated-orcid":false,"given":"Gavin","family":"Giovannoni","sequence":"additional","affiliation":[{"name":"Department of Neurology, Royal London Hospital, Barts Health NHS Trust, London, UK"},{"name":"Blizard Institute, Queen Mary University, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2017,9,25]]},"reference":[{"key":"2025090410222553000_18.1.35.1","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1007\/s11154-017-9424-1","article-title":"The vitamin D deficiency pandemic: approaches for diagnosis, treatment and prevention","volume":"18","author":"Holick","year":"2017","journal-title":"Rev Endocr Metab Disord"},{"key":"2025090410222553000_18.1.35.2","first-page":"2813","article-title":"Scientific opinion on the tolerable upper intake level of vitamin D","volume":"10","year":"2012","journal-title":"EFSA Journal"},{"key":"2025090410222553000_18.1.35.3","first-page":"4634","article-title":"Scientific opinion on dietary reference values for vitamin D","volume":"14","year":"2016","journal-title":"EFSA Journal"},{"key":"2025090410222553000_18.1.35.4","unstructured":"Vitamin D and Health: Scientific Advisory Committee on Nutrition. 2016. https:\/\/www.gov.uk\/government\/uploads\/system\/uploads\/attachment_data\/file\/537616\/SACN_Vitamin_D_and_Health_report.pdf"},{"key":"2025090410222553000_18.1.35.5","doi-asserted-by":"publisher","DOI":"10.1001\/jama.1917.02590460009002"},{"key":"2025090410222553000_18.1.35.6","doi-asserted-by":"crossref","first-page":"1817","DOI":"10.1056\/NEJMp1608005","article-title":"Vitamin D Deficiency - Is There Really a Pandemic?","volume":"375","author":"Manson","year":"2016","journal-title":"N Engl J Med"},{"key":"2025090410222553000_18.1.35.7","doi-asserted-by":"publisher","DOI":"10.1001\/jama.1940.72810310011009a"},{"key":"2025090410222553000_18.1.35.8","unstructured":"National Osteoporosis Society Practical Guides. 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