As a measles outbreak spreads across the United States, doctors are now seeing a new and unexpected danger: children getting sick from taking too much vitamin A. At Covenant Children's Hospital in Lubbock, Texas, several unvaccinated children showed signs of liver problems after taking large amounts of vitamin A, according to Dr. Lara Johnson , the hospital's chief medical officer. Advertisement U.S. Department of Health and Human Services Secretary Robert F. Kennedy Jr . has promoted vitamin A