Tablets and oil were compared for the effect on S-25-OHD concentrations after 3–5 months and antibiotic use. Methods: We compared the effectiveness of tablets versus oil in raising S-25-hydroxyvitamin D (S-25-OHD) in plasma by re-analyzing data from a previously performed observational study in which immunodeficient patients with S-25-OHD concentrations <75 nmol/L were randomly prescribed vitamin D 3 tablets (1600 IU/day) or vitamin D 3 oil-drops (1500 IU/day) for twelve months. Background: Vitamin D 3 supplements are available as tablets or oil drops, but there is no consensus as to whether either of these preparations is more effective than the other.
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