AGEING: BIOLOGY AND NUTRITION: Edited by Jürgen M. Bauer and John E. MorleyVitamin D for the older patient from hype to hope?Cavalier, Etiennea; Bruyère, Olivierb,cAuthor Information aDepartment of Clinical Chemistry bDivision of Public Health, Epidemiology and Health Economics, University of Liège cWHO Collaborating Centre for Public Health Aspects of Musculoskeletal Health and Ageing, Liège, Belgium Correspondence to Professor Olivier Bruyère, PhD, Division of Public Health, Epidemiology and Health Economics, University of Liège, CHU Sart-Tilman, Bât B23, 4000 Liège, Belgium. Tel: +32 43 66 25 81; e-mail: firstname.lastname@example.org Current Opinion in Clinical Nutrition and Metabolic Care: January 2020 - Volume 23 - Issue 1 - p 4-7 doi: 10.1097/MCO.0000000000000616 Buy Metrics Abstract Purpose of review The review critically appraises the most recent and important meta-analyses that have assessed the effect of vitamin D supplementation on bone health in the older population. Recent findings Vitamin D status is generally lower in study participants with bone wasting. However, studies on the effects of vitamin D supplementation on bone health, summarized in different meta-analyses, have provided conflicting results, likely because of the heterogeneity between studies. Interventional studies performed using more physiological doses of vitamin D (i.e. avoiding very large, nonphysiological doses) or in study participants with low vitamin D status have provided more beneficial effects on bone health. Summary Meta-analyses assessing the impact of vitamin D in the treatment of osteoporosis are heterogeneous in their conception or their results and sometimes have included inappropriate studies to answer the useful research question for the clinician, making the interpretation and the clinical use of these conflicting meta-analyses quite difficult. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.