In September 2006, it recalled 32-ounce plastic bottles of Similac Alimentum Advance ready-to-eat liquid formula, two lots of Similac Advance with Iron ready-to-eat infant formula and one lot of Similac Advance Hospital Discharge Kits, because consumers complained the formula was unusually dark in color. The company said bottles in affected lots might not contain as much vitamin C as indicated on the label and that "the problem is due to an isolated bottle defect" that was corrected by the third-party bottle supplier. The affected bottles were missing a special plastic layer designed to protect the formula from exposure to oxygen, which can reduce vitamin C content. No serious medical complaints were reported.
In May 2007, it recalled three lots of 2-ounce bottles of Similac Special Care Ready-to-Feed Premature Infant Formula with Iron, because they didn't contain as much iron as indicated on their labels. The company and the FDA said preemies fed the formula for more than a month after discharge "could have an increased risk of developing anemia due to insufficient iron intake," but no serious medical complaints were reported.