A new study of more than 1.2 million people found no link between aluminum in childhood vaccines and long-term health problems, including autism and asthma.

Aluminum exposure from childhood vaccines doesn't lead to increased risk of autoimmune, allergic or neurodevelopmental disorders, Danish researchers wrote in a study published Monday. Why it matters: The findings in the Annals of Internal Medicine debunk a common claim by the Make America Healthy Again movement about the toxic effects of childhood vaccines.