Fig. 5

Correlation between changes in day-28 25(OH)D2 and 25(OH)D3 levels and baseline total 25(OH)D level. a and b, study-1: participants were randomized to a single oral dose of 50,000 IU D2 or placebo. c and d, study-2: participants were randomized to a single oral dose of 50,000 IU D3 or placebo four days after receiving a single oral dose of 50,000 IU D2. 25(OH)D2, 25-hydroxyvitamin D2. 25(OH)D3, 25-hydroxyvitamin D3. 25(OH)D, total 25-hydroxyvitamin D. a, rho = − 0.79 (CI, − 0.66 to − 0.88), p < 0.001. b, rho = − 0.17 (CI, 0.12 to − 0.43), p = 0.31. c, rho = − 0.36 (CI, − 0.09 to − 0.58), p = 0.01. d, rho = − 0.42 (CI, − 0.15 to − 0.63), p = 0.003