Douglass Bibuld

Vitamin D2 is as effective as vitamin D3 in maintaining circulating concentrations of 25-hydroxyvitamin D

The Journal of Clinical Endocrinology & Metabolism · 2008 · 512 citations

Fortification of orange juice with vitamin D(2) or vitamin D(3) is as effective as an oral supplement in maintaining vitamin D status in adults

American Journal of Clinical Nutrition · 2010 · 125 citations