In this seven-arm , randomized , double-blind , controlled parallel-group study , 35 healthy females aged 5070 years ( 5 per group ) received 20 g calcifediol or vitamin D ( 3 ) daily , 140 g calcifediol or vitamin D ( 3 ) weekly , for 15 weeks , or a single bolus of either 140 g calcifediol , or vitamin D ( 3 ) , or both .