Daily supplementation with 15 μg vitamin D2 compared with vitamin D3 to increase wintertime 25-hydroxyvitamin D status in healthy South Asian and white European women: a 12-wk randomized, placebo-controlled food-fortification trial

L. Tripkovic, L. Wilson, K. Hart, Sig Johnsen, Simon de Lusignan, Colin Smith, Giselda Bucca, S. Penson, G. Chope, R. Elliott