Obesity Surgery

, Volume 19, Issue 2, pp 173–179 | Cite as

Finding the Optimal Dose of Vitamin D Following Roux-en-Y Gastric Bypass: A Prospective, Randomized Pilot Clinical Trial

  • Whitney S. GoldnerEmail author
  • Julie A. Stoner
  • Elizabeth Lyden
  • Jon Thompson
  • Karen Taylor
  • Luann Larson
  • Judi Erickson
  • Corrigan McBride
Research Article



Vitamin D deficiency is common following bariatric surgery and is due to a combination of baseline deficiency and postoperative malabsorption. There are few prospective studies evaluating the appropriate dose of vitamin D to prevent and treat vitamin D deficiency following bariatric surgery.


We evaluated three doses of vitamin D3 (800, 2,000, and 5,000 IU/day) in a prospective, randomized pilot trial of 45 patients undergoing Roux-en-Y gastric bypass. Serum 25 hydroxy Vitamin D (25OHD), intact PTH (iPTH), calcium, and urine calcium/creatinine ratios were measured at 6, 12, and 24 months postoperatively. Due to a high dropout rate at 24 months, we focus on the 12-month data.


At 12 months, the 800-, 2,000-, and 5,000-IU groups had a mean ± SD increase in 25OHD of 27.5 ± 40.0, 60.2 ± 37.4, and 66.1 ± 42.2 nmol/L, respectively (p = 0.09) with a maximum increase in each group of 87.4, 114.8, and 129.8 nmol/L. Forty-four percent, 78%, and 70% achieved 25OHD levels ≥75 nmol/L (p = 0.38). Results for the 6- and 24-month time points were similar to the 12-month results. Mean weight loss at 24 months of the study was not different among groups (p = 0.52). Serum calcium did not change significantly, and there were no cases of hypercalcemia or sustained hypercalciuria.


Higher doses of vitamin D supplementation trend towards higher levels of 25OHD. Vitamin D replacement as high as 5,000 IU /day is safe and necessary in many patients to treat vitamin D deficiency following Roux-en-Y gastric bypass yet is still suboptimal in others.


Vitamin D deficiency Bariatric surgery Obesity Vitamin D supplementation Treatment 



This work was funded by a grant of the Clinical Research Center at the University of Nebraska Medical Center.




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Copyright information

© Springer Science + Business Media, LLC 2008

Authors and Affiliations

  • Whitney S. Goldner
    • 1
    Email author
  • Julie A. Stoner
    • 2
  • Elizabeth Lyden
    • 3
  • Jon Thompson
    • 4
  • Karen Taylor
    • 4
  • Luann Larson
    • 5
  • Judi Erickson
    • 1
  • Corrigan McBride
    • 4
  1. 1.Section of Diabetes, Endocrinology, and Metabolism, Department of Internal MedicineUniversity of Nebraska Medical CenterOmahaUSA
  2. 2.Department of Biostatistics and Epidemiology, College of Public HealthUniversity of Oklahoma Health Sciences CenterOklahoma CityUSA
  3. 3.Department of Biostatistics, College of Public HealthUniversity of Nebraska Medical CenterOmahaUSA
  4. 4.Department of SurgeryUniversity of Nebraska Medical CenterOmahaUSA
  5. 5.Clinical Research Center, Department of Internal MedicineUniversity of Nebraska Medical CenterOmahaUSA

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