Consensus statement on vitamin D status assessment and supplementation: Whys, whens, and hows
Open accessAbstract
The 6th International Conference, “Controversies in Vitamin D,” was convened to discuss controversial topics, such as vitamin D metabolism, assessment, actions, and supplementation. Novel insights into vitamin D mechanisms of action suggest links with conditions that do not depend only on reduced solar exposure or diet intake and that can be detected with distinctive noncanonical vitamin D metabolites. Optimal 25-hydroxyvitamin D (25(OH)D) levels remain debated. Varying recommendations from different societies arise from evaluating different clinical or public health approaches. The lack of assay standardization also poses challenges in interpreting data from available studies, hindering rational data pooling and meta-analyses. Beyond the well-known skeletal features, interest in vitamin D's extraskeletal effects has led to clinical trials on cancer, cardiovascular risk, respiratory effects, autoimmune diseases, diabetes, and mortality. The initial negative results are likely due to enrollment of vitamin D-replete individuals. Subsequent post hoc analyses have suggested, nevertheless, potential benefits in reducing cancer incidence, autoimmune diseases, cardiovascular events, and diabetes. Oral administration of vitamin D is the preferred route. Parenteral administration is reserved for specific clinical situations. Cholecalciferol is favored due to safety and minimal monitoring requirements. Calcifediol may be used in certain conditions, while calcitriol should be limited to specific disorders in which the active metabolite is not readily produced in vivo. Further studies are needed to investigate vitamin D effects in relation to the different recommended 25(OH)D levels and the efficacy of the different supplementary formulations in achieving biochemical and clinical outcomes within the multifaced skeletal and extraskeletal potential effects of vitamin D.
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25(OH)D and testosterone assays varied across trials.
“These issues are particularly relevant because several androgen outcomes were secondary biomarkers, and because 25(OH)D and testosterone assays varied across trials [3,10,35,36].”
From Vitamin D Supplementation, Total Testosterone, and Androgen Bioavailability Markers in Adult Men: A Systematic Review and Meta-Analysis of Randomized Controlled Trials (2026) · cites this paper as [3]
The ‘Methods: Assays, Thresholds, and Standardization’ section (page unavailable) says that differences in 25(OH)D assays complicate comparisons across studies. It does not establish that testosterone assays varied across the trials in question; the passages found on steroid hormones do not address testosterone assay variation. (LLM, conf=0.85)
Experimental — accuracy not yet measuredSupplementation effects depend strongly on baseline vitamin D status, assay standardization, dose, formulation, adherence, and population context.
“supplementation effects depend strongly on baseline status, assay standardization, dose, formulation, adherence, and population context [1,2,3,4,5,6].”
The present results are consistent with the broader vitamin D trial literature, where extra-skeletal effects often appear weaker in randomized evidence than in observational studies.
“The present results are consistent with the broader vitamin D trial literature, where extra-skeletal effects often appear weaker in randomized evidence than in observational studies [3,4,5,6].”
Vitamin D supplementation effects depend on baseline 25(OH)D status, dose, formulation, adherence, duration, body composition, and whether participants are deficient or already replete at baseline.
“Vitamin D supplementation effects depend on baseline 25(OH)D status, dose, formulation, adherence, duration, body composition, and whether participants are deficient or already replete at baseline [3,4,5,6].”
Several androgen outcomes were secondary biomarkers.
“These issues are particularly relevant because several androgen outcomes were secondary biomarkers, and because 25(OH)D and testosterone assays varied across trials [3,10,35,36].”
From Vitamin D Supplementation, Total Testosterone, and Androgen Bioavailability Markers in Adult Men: A Systematic Review and Meta-Analysis of Randomized Controlled Trials (2026) · cites this paper as [3]
The ‘Assessment of Other Metabolites’ section discusses vitamin D metabolites measured in trials, not androgen outcomes designated as secondary biomarkers. Searches for ‘androgen,’ ‘testosterone,’ and ‘secondary outcomes’ found no passage in our copy establishing the claimed status of the androgen outcomes. (LLM, conf=0.76)
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Cites
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Self-citation(2015) · The Lancet Diabetes & Endocrinology · doi:10.1016/s2213-8587(15)00291-0 · Cited by 1,029 · see citing works
Vitamin D bioavailability: state of the art
Borel, P., Caillaud, D., & Cano, N. J. (2015) · Critical Reviews in Food Science and Nutrition · doi:10.1080/10408398.2012.688897 · Cited by 378 · see citing works
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“In addition, several independent trials have suggested, in post hoc analysis, the potential benefits of vitamin D supplementation on cancer mortality, especially when the follow-up is longer than 4 years (139).”
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Paez-Allendes, L., Valenzuela-Fuenzalida, J. J., Moya, M. P., Oyanedel, G., Cifuentes-Suazo, G., Figueroa-Puig, J., Orellana-Donoso, M., Mateluna-Valls, E., Cabezas-Salgado, J. J., Sanchis-Gimeno, J., et al. (2026) · Nutrients · doi:10.3390/nu18132090
- Authors
- Giustina, A., Bilezikian, J. P., Adler, R. A., Banfi, G., Bikle, D. D., Binkley, N. C., Bollerslev, J., Bouillon, R., Brandi, M. L., Casanueva, F. F., di Filippo, L., Donini, L. M., Ebeling, P. R., Fuleihan, G. E.-H., Fassio, A., Frara, S., Jones, G., Marcocci, C., Martineau, A. R., Minisola, S., Napoli, N., Procopio, M., Rizzoli, R., Schafer, A. L., Sempos, C. T., Ulivieri, F. M., & Virtanen, J. K.
- Affiliations
- Vita-Salute San Raffaele University (IT)
- Department of Medicine, Vagelos College of Physicians and Surgeons , New York, NY 10032 , USA
- Virginia Commonwealth University (US)
- San Francisco VA Medical Center (US)
- University of Wisconsin–Madison (US)
- University of Oslo (NO)
- KU Leuven (BE)
- Italian Foundation for the Research on Bone Diseases (F.I.R.M.O.) , Florence 50129 , Italy
- Universidade de Santiago de Compostela (ES)
- Institute of Endocrine and Metabolic Sciences, San Raffaele Vita-Salute University and IRCCS Hospital , Milan 20132 , Italy
- Sapienza University of Rome (IT)
- Monash University (AU)
- American University of Beirut (LB)
- University of Verona (IT)
- Queen's University (CA)
- University of Pisa (IT)
- Queen Mary University of London (GB)
- Università Campus Bio-Medico (IT)
- Division of Endocrinology, Diabetology and Metabolic Diseases, “Molinette” Hospital, University of Turin , Turin 10126 , Italy
- University Hospital of Geneva (CH)
- Vitamin D Standardization Program (VDSP) , Havre de Grace, MD 21078 , USA
- University of Eastern Finland (FI)
- Corresponding author
- Bilezikian, John P
- ORCID
- Giustina, Andrea
- Bilezikian, John P
- Adler, Robert A
- Banfi, Giuseppe
- Bikle, Daniel D
- Binkley, Neil C
- Bollerslev, Jens
- Bouillon, Roger
- Brandi, Maria Luisa
- Casanueva, Felipe F
- Donini, Lorenzo M
- Ebeling, Peter R
- Fuleihan, Ghada El-Hajj
- Fassio, Angelo
- Frara, Stefano
- Jones, Glenville
- Marcocci, Claudio
- Martineau, Adrian R
- Minisola, Salvatore
- Napoli, Nicola
- Rizzoli, René
- Schafer, Anne L
- Sempos, Christopher T
- Ulivieri, Fabio Massimo
- Virtanen, Jyrki K
- Venue
- Endocrine Reviews
- Publisher
- The Endocrine Society
- Published
- 2024-04-27
- Volume
- 45
- Issue
- 5
- Pages
- 625-654
- ISSN
- 0163-769X (ISSN-L)
- 1945-7189
- PMC
- PMC11405507
- OpenAlex
- W4395699495
- Cited by
- 392
- References
- 6
- Citations by year
- 2026: 178 · 2025: 169 · 2024: 45
- FWCI
- 110.92
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Endocrine Reviews (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Archivio Istituzionale della Ricerca - Università Vita-Salute San Raffaele (submittedVersion, cc-by)
- Lirias (KU Leuven) (submittedVersion, cc-by)
- IRIS Research product catalog (Sapienza University of Rome) (submittedVersion)
- NORA - Norwegian Open Research Archives (submittedVersion, cc-by)
- Funders
- Abiogen Pharma
- Topics
- Health Sciences › Medicine › Pathology and Forensic Medicine › Vitamin D Research Studies
- Health Sciences › Medicine › Nephrology › Parathyroid Disorders and Treatments
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
- Keywords
- vitamin D status assessment, vitamin D supplementation, 25-hydroxyvitamin D, vitamin D metabolites, vitamin D3, 1,25-dihydroxyvitamin D3, cancer, cardiovascular risk, autoimmune disease, diabetes mellitus, mortality
- MeSH terms
- Humans, Review Literature as Topic, Vitamin D, Vitamin D Deficiency, Dietary Supplements
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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