The D2-D3 Study: a randomised, double-blind, placebo-controlled food-fortification trial in women, comparing the efficacy of 15ug/d vitamin D2 vs vitamin D3 in raising serum 25OHD levels

L. Tripkovic, L. Wilson, K. Hart, R. Elliott, Colin Smith, Giselda Bucca, S. Penson, G. Chope, E. Hypponen, J. Berry, S. Lanham-New