The Annals of Internal Medicine said it will not retract a large Danish study after U.S. Health and Human Services Secretary Robert F. Kennedy Jr. demanded the journal withdraw the paper, which examined the safety of aluminum adjuvants in childhood vaccines. Kennedy, a longtime critic of vaccination policy, described the research as "deceitful" and alleged methodological flaws. Published in July and funded by the Danish government, the study analyzed health-registry data for more than 1.2 million children over two decades. It found no evidence that cumulative exposure to aluminum-containing vaccines increased the risk of autoimmune, allergic or neurodevelopmental disorders, including autism and asthma. Editor-in-chief Dr. Christine Laine told Reuters, "I see no reason for retraction," adding that the journal will address external comments on its website. Lead author Anders Peter Hviid of the Statens Serum Institut defended the work, noting that Denmark’s 2 percent unvaccinated population was too small for meaningful comparison and that individual-level data cannot be released under Danish law. Independent specialists praised the scale and design of the research. Adam Finn called the dataset "massive" and of "high-quality," while Johns Hopkins physician Amesh Adalja said the study’s limitations do not undermine its conclusions. The dispute underscores Kennedy’s broader effort to reassess federal immunization guidance, a stance that continues to draw pushback from mainstream scientific circles.