Here is a diverging opinion, stating that the studies that "proved" this were conducted incorrectly, and the one that had sufficient validity found no differenc

Here is a diverging opinion, stating that the studies that "proved" this were conducted incorrectly, and the one that had sufficient validity found no difference between chelate, citrate and oxide: http://www.pharmazeutische-zeitung.de/index.php?id=29065 http://www.pharmazeutische-zeitung.de/index.php?id=29065 Its in german but Google translate should work well.