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Higher 25(OH)D2 is associated with lower 25(OH)D3 and 1,25(OH)2D3.
Swanson CM, Nielson CM, Shrestha S, Lee CG, Barrett-Connor E, Jans I, Cauley JA, Boonen S, Bouillon R, Vanderschueren D, Orwoll ES; Osteoporotic Fractures in Men (MrOS) Study Research Group. Swanson CM, et al. J Clin Endocrinol Metab. 2014 Aug;99(8):2736-44. doi: 10.1210/jc.2014-1069. Epub 2014 May 14. J Clin Endocrinol Metab. 2014. PMID: 24828488 Free PMC article.
Associations of 25-Hydroxyvitamin D and 1,25-Dihydroxyvitamin D With Bone Mineral Density, Bone Mineral Density Change, and Incident Nonvertebral Fracture.
Swanson CM, Srikanth P, Lee CG, Cummings SR, Jans I, Cauley JA, Bouillon R, Vanderschueren D, Orwoll ES, Nielson CM; Osteoporotic Fractures in Men MrOS Study Research Group. Swanson CM, et al. J Bone Miner Res. 2015 Aug;30(8):1403-13. doi: 10.1002/jbmr.2487. Epub 2015 May 22. J Bone Miner Res. 2015. PMID: 25707402 Free PMC article. Clinical Trial.