Effectiveness of a fortified drink in improving B vitamin biomarkers in older adults: a controlled intervention trial oleh Maria Heffernan, Leanne C. Doherty, Roberta Hack Mendes, Michelle Clarke, Stephanie Hodge, Michelle Clements, Liadhan McAnena, Mari Rivelsrud, Mary Ward, J. J. Strain, Helene McNulty, Lorraine Brennan