• Cristiana Cipriani, Elisabetta Romagnoli, Alfredo Scillitani, Iacopo Chiodini, Rita Clerico, Vincenzo Carnevale, Maria Lucia Mascia, Claudia Battista, Raffaella Viti, Mauro Pileri, Cristina Eller-Vainicher, and Salvatore Minisola.
• Department of Clinical Sciences, University of Rome Sapienza, Rome, Italy. cristianac@alice.it
• J. Clin. Endocrinol. Metab. 2010 Oct 1; 95 (10): 4771-7.

ContextEffects of vitamin D repletion in young people with low vitamin D status have not been investigated so far.ObjectiveWe evaluated the effect of a single massive dose of cholecalciferol on calcium metabolism at 3, 15, and 30 d, compared to baseline.Design And SettingWe conducted a prospective intervention study in an ambulatory care setting.ParticipantsForty-eight young subjects with vitamin D deficiency participated in the study.InterventionA single oral dose of 600,000 IU of cholecalciferol was administered to each subject.Main Outcome MeasuresWe evaluated serum changes of 25-hydroxyvitamin D [25(OH)D], 1,25-dihydroxyvitamin D, calcium, and PTH induced by a single load of cholecalciferol.ResultsThe 25(OH)D level was 15.8 ± 6.5 ng/ml at baseline and became 77.2 ± 30.5 ng/ml at 3 d (P < 0.001) and 62.4 ± 26.1 ng/ml at 30 d (P < 0.001). PTH levels concomitantly decreased from 53.0 ± 20.1 to 38.6 ± 17.2 pg/ml at 3 d and to 43.4 ± 14.0 pg/ml at 30 d (P < 0.001 for both). The trends were maintained in a subgroup followed up to 90 d (P < 0.001). Mean serum Ca and P significantly increased compared to baseline, whereas serum Mg decreased at 3 d. 1,25-Dihydroxyvitamin D significantly increased from 46.8 ± 18.9 to 97.8 ± 38.3 pg/ml at 3 d (P < 0.001) and to 59.5 ± 27.3 pg/ml at 60 d (P < 0.05).ConclusionsA single oral dose of 600,000 IU of cholecalciferol rapidly enhances 25(OH)D and reduces PTH in young people with vitamin D deficiency.

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