Aluminum salts emerge as likely target as health officials scrutinize childhood vaccines

Source: NBC News

Dec. 26, 2025, 5:00 AM EST


With further changes to the U.S.’ recommended vaccine schedule likely in the year ahead under Health Secretary Robert F. Kennedy Jr.’s leadership, his agency’s recent scrutiny of one vaccine additive in particular — aluminum salts — may offer a clue about what’s to come.

Earlier this month, members of the Centers for Disease Control and Prevention’s vaccine advisory committee — whom Kennedy selected after firing the previous group — suggested digging into concerns about aluminum salts, though large studies have found them to be safe. Andrew Nixon, a spokesperson for the Department of Health and Human Services, told NBC News that the committee is “reviewing the body of science related to aluminum and other possible contaminants in childhood vaccine[s].”

Similarly, a statement that appeared on the CDC website last month said that HHS is investigating whether aluminum in vaccines could be linked to autism.

Aluminum salts are not a “contaminant” in vaccines: The compound is added as an adjuvant, an ingredient that boosts the body’s immune response to a vaccine, allowing for a smaller dose to be used. Nearly a century of evidence has found it to be safe for this purpose. Aluminum salts are naturally present in soil and water, and the amount children are exposed to from vaccines is minuscule compared with cumulative daily exposures from food. (Exposure from infant formula or breastmilk is higher than exposure from vaccines in the first six months of life, as well.)

Read more: https://www.nbcnews.com/health/kids-health/aluminum-salts-vaccines-kennedy-rcna248055