Toxic Element Contamination of Natural Health Products and Pharmaceutical Preparations Genuis, Stephen J. ; Schwalfenberg, Gerry ; Siy, Anna-Kristen J. ; Rodushkin, Ilya Abstract Publication: PLoS ONE Pub Date: November 2012 DOI: 10.1371/journal.pone.0049676 Bibcode: 2012PLoSO...749676G