Publishers are caretakers of science. Part of that work is maintaining the integrity of scientific literature. Science builds directly upon past work, so we need to be sure that we are building upon a solid foundation and not faulty research. Publishers need to take an active role in monitoring and tracking faulty, retracted research and its influence. I'm asking publishers to (1) clearly mark retracted papers; (2) alert authors who have already cited a retracted paper; and (3) before publishing an article, check its bibliography for retracted papers. Retracted papers should be clearly marked everywhere they appear, but today that is not the case. Publishers can also use the CrossRef CrossMark service, which lets readers check for article updates (such as retraction) from a little red ribbon at the top of an article. Checking for citations to retracted articles, and limiting future citations, can help science self-correct by shoring up its foundations.