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Vitamin D: 2000 vs 1000 IU/d (RCT) — 2000 IU is more effective in promoting D3 & HDL-C and in decreasing iPTH — iPTH: −4.18 (P=.002) in 1000 IU/d group vs −8.36 (P=.002) in 2000 IU/d — D3: 24.01 (P<.001) in 1000 IU/d vs 46.7 nmol/L (P<.001) in 20