Fig. 1.

Vitamin D₃ supplementation increases serum 25-OH vitamin D and does not impact serum calcium or lung function. a) Vitamin D levels increased over the 24 weeks of supplementation but were only significantly higher between day 0 and the 24-week time point. b) Serum calcium levels did not change significantly over the 24-week trial period. c) Urine calcium:creatinine ratios increased slightly over 24-weeks and were significantly higher between day 0 and 24-weeks. Data is graphed as for each individual patient at each time point P