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In an open-label study by Dutta et al. in subjects with IGT or IFG, vitamin D supplementation of 60,000 IU (1500 μg) once per week for 8 weeks and then monthly along with 1250 mg of calcium carbonate/d resulted in lower fasting blood glucose and improvement in insulin resistance during an average follow-up of 28 months, when compared with subjects taking only calcium carbonate [6].
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