Aluminum salts are ingredients added to some vaccines to help the immune system respond more strongly. They are not aluminum metal — they are tiny compounds that boost immunity so fewer doses are needed.
These ingredients have been used safely in vaccines for many decades and had been studied carefully before approval.
Some critics, including Health Secretary Robert F. Kennedy Jr., have said these salts could be linked to allergies or other conditions. But large scientific studies — including one of more than a million children — found no link between aluminum in vaccines and autism, asthma, or other chronic diseases.
Experts say the amount of aluminum in vaccines is very small and that people get more from food and the environment every day. The scientific consensus remains that vaccines with aluminum salts are safe and effective.
