A recent Danish study, published in July 2025, analyzed data from over 1.2 million children over two decades and found no evidence linking aluminum exposure in vaccines to increased risks of autoimmune, atopic, allergic, or neurodevelopmental disorders.

In response to the study's findings, Health Secretary Robert F. Kennedy Jr. requested a retraction from the Annals of Internal Medicine, a prominent U.S. medical journal, but his request was denied.

Dr. Christine Laine, the journal's editor in chief, stated there was no reason to retract the study and emphasized its solid methodology and findings.

Kennedy criticized the study as a 'deceitful propaganda stunt' designed to avoid finding harm, calling for its immediate retraction.

Lead author Anders Peter Hviid addressed Kennedy's critiques, noting that while some design choices are debatable, the study was not intended to conceal harm and highlighted the absence of a control group due to the small percentage of unvaccinated children in Denmark.

While some of Kennedy's concerns highlight limitations of the study, Laine concluded that these do not undermine the overall findings or suggest scientific misconduct.

Experts like Adam Finn, a pediatric vaccination expert, praised the study for its robust methodology and large dataset, calling it the best available evidence on aluminum safety in vaccines.

Despite criticisms from Kennedy and other vaccine skeptics, some scientists have defended the study's scale and transparency.

In a related development, Vinay Prasad is set to return to the U.S. Food and Drug Administration (FDA) to oversee vaccine regulation after being ousted amid political tensions.

Prasad's reinstatement goes against the wishes of Health Secretary Kennedy and FDA Commissioner Marty Makary.

Kennedy has long expressed skepticism about vaccine safety and is considering a review of aluminum-containing vaccines, which he believes are linked to autoimmune diseases and allergies.

The study's data is available for further research, but individual-level data cannot be released due to Danish law, according to Hviid.