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Br J Nutr. 2019 Mar;121(5):538-548. doi: 10.1017/S0007114518003690.

Impact of three different daily doses of vitamin D3 supplementation in healthy schoolchildren and adolescents from North India: a single-blind prospective randomised clinical trial.

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1Department of Endocrinology and Thyroid Research Centre,Institute of Nuclear Medicine and Allied Sciences,DRDO,Timarpur,New Delhi 110054,India.
2Department of Medicine,All India Institute of Medical Sciences,Jodhpur 432005,India.
3Department of Dermatology,All India Institute of Medical Sciences,New Delhi 110029,India.
4Department of Endocrinology and Metabolism,All India Institute of Medical Sciences,New Delhi 110029,India.
5Department of Endocrinology,Medanta Hospital,Gurgram 122006,India.
6Dang Laboratories,New Delhi 110016,India.
7Department of Biostatistics,All India Institute of Medical Sciences,New Delhi 110029,India.
8Dr B R Sur Homeopathic Medical College,New Delhi 110021,India.
9Central Council of Homeopathic Research,Ministry of Ayush,New Delhi 110023,India.


In India, there is a lack of information about the adequate daily dose of vitamin D3 supplementation in school children. Hence, we undertook this study to evaluate the adequacy and efficacy of different doses of vitamin D3 in schoolchildren. A total of 1008 vitamin D-deficient (VDD) children, aged 6-16 years with serum 25-hydroxyvitamin D (25(OH)D) levels <50nmol/l, were cluster randomised into three groups (A-344, B-341 and C-232) for supplementation (600, 1000 and 2000 IU daily) of vitamin D3 under supervision for 6 months. Of the 1008 subjects who completed the study, 938 (93 %) were compliant. Baseline and post-supplementation fasting blood and urine samples were evaluated for Ca, phosphates, alkaline phosphatase, 25(OH)D and parathormone and urine Ca:creatinine ratio. The mean age of the subjects was 11·7 (sd 2·4) years, and the overall mean baseline serum 25(OH)D level was 24·3 (SD 9·5)nmol/l. Post-supplementation rise in serum 25(OH)D in compliant group was maximum with 2000 IU (70·0 (SD 30·0)nmol/l), followed by 1000 IU (46·8 (SD 22·5)nmol/l) and 600 IU (36·5 (SD 18·5)nmol/l), and serum 25(OH)D levels of ≥50nmol/l were achieved in 71·5, 81·8 and 92·9 % by groups A, B and C, respectively. Secondary hyperparathyroidism decreased from 31·7 to 8·4 % post-supplementation. Two participants developed hypercalciuria, but none developed hypercalcaemia. Children with VDD benefit maximum with the daily supplementation of 2000 IU of vitamin D3. Whether recommendations of 400 IU/d by Indian Council of Medical Research or 600 IU by Indian Academy of Pediatrics or Institute of Medicine would suffice to achieve vitamin D sufficiency in children with VDD remains debatable.


25(OH)D 25-hydroxyvitamin D; ALP alkaline phosphatase; IAP Indian Academy of Pediatrics; ICMR Indian Council of Medical Research; IOM Institute of Medicine; PTH parathyroid hormone; UCaCrR urinary calcium:creatinine ratio; VDD vitamin D deficiency; Children and adolescents; Secondary hyperparathyroidism; Vitamin D deficiency; Vitamin D3 supplementation


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