Vitamin D Oral Replacement in Children With Obesity Related Asthma: VDORA1 Randomized Clinical Trial

Brian O'Sullivan, Song Ounpraseuth, Laura James, Marc Majure, Jason Lang, Zhuopei Hu, Alan Simon, Scott Bickel, Brian Ely, L. E. Faricy, Maryam Garza, Melody Greer, Daniel Hsia, Akilah Jefferson, Lisa Knight, Jeannette Lee, Deborah Liptzin, Mehtap Haktanir Abul, Tamara T. Perry, Fred PriorChristine SanGiovanni, Jade Tam-Williams, Brian Wu, Jessica Snowden

Research output: Contribution to journalArticlepeer-review


Children with asthma and obesity are more likely to have lower vitamin D levels, but the optimal replacement dose is unknown in this population. The objective of this study is identifying a vitamin D dose in children with obesity-related asthma that safely achieves serum vitamin D levels of ≥ 40 ng/mL. This prospective multisite randomized controlled trial recruited children/adolescents with asthma and body mass index ≥ 85% for age/sex. Part 1 (dose finding), evaluated 4 oral vitamin D regimens for 16 weeks to identify a replacement dose that achieved serum vitamin D levels ≥ 40 ng/mL. Part 2 compared the replacement dose calculated from part 1 (50,000 IU loading dose with 8,000 IU daily) to standard of care (SOC) for 16 weeks to identify the proportion of children achieving target serum 25(OH)D level. Part 1 included 48 randomized participants. Part 2 included 64 participants. In Part 1, no SOC participants achieved target serum level, but 50–72.7% of participants in cohorts A-C achieved the target serum level. In part 2, 78.6% of replacement dose participants achieved target serum level compared with none in the SOC arm. No related serious adverse events were reported. This trial confirmed a 50,000 IU loading dose plus 8,000 IU daily oral vitamin D as safe and effective in increasing serum 25(OH)D levels in children/adolescents with overweight/obesity to levels ≥ 40 ng/mL. Given the critical role of vitamin D in many conditions complicating childhood obesity, these data close a critical gap in our understanding of vitamin D dosing in children.

Original languageEnglish
Pages (from-to)231-238
Number of pages8
JournalClinical Pharmacology and Therapeutics
Issue number2
StatePublished - Feb 2024


  • Adolescent
  • Child
  • Humans
  • Vitamin D
  • Cholecalciferol/adverse effects
  • Prospective Studies
  • Vitamin D Deficiency/diagnosis
  • Pediatric Obesity/complications
  • Vitamins
  • Asthma/drug therapy
  • Dietary Supplements


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