An open-label, randomized, 10 weeks prospective study on the efficacy of vitamin D (daily low dose and weekly high dose) in vitamin D deficient patients

BACKGROUND: Vitamin D is an important vitamin required to maintain normal skeletal as well as nonskeletal functions. The daily supplementation of vitamin D not only have poor adherence to the regimen but also of doubtful efficacy in deficient patients. OBJECTIVES: The aim of this study was to compare the effect of oral high-dose vitamin D regimens (60,000 IU weekly) and daily low-dose vitamin D regimen of 1000 IU in mitigating symptoms and increase in serum levels of vitamin D in patients with hypovitaminosis D. MATERIALS AND METHODS: A total of 90 patients aged 18–60 years with vitamin D deficiency (serum levels < 30 ng/mL) were enrolled. A total of 38 subjects received 60,000 IU of vitamin D weekly with 500 mg/day calcium and 40 subjects received a dose of 1000 IU of vitamin D daily with 500 mg/day calcium for 10 weeks. Baseline and follow-up total serum vitamin D levels and improvement in symptoms were measured within and between groups. RESULTS: For high-dose vitamin D (60,000 IU weekly), the increase in mean serum vitamin D levels from baseline was 28.33 ng/mL over 10 weeks’ treatment period; whereas for the low-dose group (1000 IU daily) the mean increment in serum vitamin D was 6.79 ng/mL for the same period. The mean difference in increase in serum vitamin D between two groups was highly significant (P < 0.001). In both the groups, decrease in myalgia as evaluated on visual analog scale was observed after 10 weeks. CONCLUSIONS: High-dose vitamin D (60,000 IU weekly) regimen rapidly normalized 25(OH) D levels and ensure symptomatic relief earlier than daily dosing of 1000 IU vitamin D for same duration.