Efficacy of various prescribed vitamin D supplementation regimens on 25-hydroxyvitamin D serum levels in long-term care

Ronna N. Robbins, Monica Serra, Nalini Ranjit, Deanna M. Hoelscher, Sara J. Sweitzer, Margaret E. Briley

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Objective: The aims of this study were to examine the efficacy among various vitamin D supplementation regimens on serum 25-hydroxyvitamin D (25(OH)D) concentrations and determine the minimal dose rate required to achieve sufficient serum concentrations (≥75 nmol/l) among older adults in long-term care (LTC). Design: A 1-year medical history was abstracted from medical records, and a one-time blood draw to measure serum 25(OH)D concentrations was obtained. Individuals were stratified into vitamin D-supplemented and non-supplemented groups. The supplemented group was further categorised into four treatment forms: single-ingredient vitamin D2or3, multivitamin, Ca with vitamin D or combination of the three, and by daily prescribed doses: 0-9·9, 10-19·9, 20-49·9, 50-99·9 and >100 μg/d. Setting: Five LTC communities in Austin, Texas. Participants: One hundred seventy-three older (≥65 years) adults. Results: Of the participants, 62% received a vitamin D supplement and 55% had insufficient (≤75 nmol/l) 25(OH)D serum concentrations. Individuals receiving single-ingredient vitamin D2or3 supplementation received the highest daily vitamin D mean dose (72·5 μg/d), while combination of forms was the most frequent treatment (44%) with the highest mean serum concentration (108 nmol/l). All supplementation doses were successful at reaching sufficient serum concentrations, except those<20 μg/d. Using a prediction model, it was observed that 0·025 μg/d of vitamin D supplementation resulted in a 0·008 nmol/l increase in serum 25(OH)D concentrations. Conclusions: Based on the predictive equation, results suggest that supplementation of 37·5 μg/d of vitamin D2or3 or combination of vitamin D is most likely to achieve sufficient serum 25(OH)D concentrations in older adults in LTC.

Original languageEnglish (US)
Pages (from-to)82-89
Number of pages8
JournalPublic Health Nutrition
Issue number1
StatePublished - Jan 13 2022


  • 25-Hydroxyvitamin D
  • Long-term care
  • Older adults
  • Skilled nursing
  • Supplementation
  • Vitamin D

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Nutrition and Dietetics
  • Medicine (miscellaneous)


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