As the federal government prepares for the next meeting of the Advisory Committee on Immunization Practices, Health and Human Services Secretary Robert F. Kennedy Jr. has stepped up attacks on the aluminum vaccine ingredient used in many shots to boost the body’s immune response.
Kennedy was a longtime anti-vaccination activist before taking public office. Claimed to be aluminum supplements It is neurotoxic and can cause autism, asthma, autoimmune diseases and food allergy.
However, science and medicine offer different views. For example, parents were strongly encouraged to introduce peanut-containing foods to their infants early on. one drop Incidence of peanut allergy.
Since taking office, Kennedy has ordered a review of vaccine ingredients, citing aluminum as a top concern. Discussions on “Adjuvants and Contaminants” take place in the Vaccine Advisory Committee. draft agenda.
no way Centers for Disease Control and Prevention webpage After years of public assurances that vaccines do not cause autism, the statement was updated on November 19 to add new language stating that studies have not definitively ruled out a link between vaccines and autism.
He also targeted scientists who published studies showing that aluminum supplements were safe. In August, Kennedy criticized: Large Danish study As no link was found between aluminum contained in vaccines and childhood diseases,deceptive propaganda” And called for a retraction. The Annals of Internal Medicine rejected this claim and refused to retract the study.
And regarding the upcoming advisory committee meeting, HHS spokeswoman Emily Hilliard said ACIP is “independently reviewing the full body of evidence on adjuvants and other vaccine components to ensure the highest safety standards.”
Kennedy’s efforts to raise questions about aluminum are high-stakes because it’s not just about the ingredient itself. This is part of a broader strategy to create uncertainty about vaccine safety and lay the groundwork for vaccine safety challenges. National Vaccine Injury Compensation ProgramThis is something drug manufacturers say is essential to ensure a stable market for injections.
But researchers in the fields of infectious diseases, immunology, pediatrics and epidemiology say the data is clear. Aluminum supplements are safe.
“Aluminum is the third most common element on the surface of the Earth,” said Paul Offit, a pediatrician and director of the Vaccine Education Center at the Children’s Hospital of Philadelphia. “So we’re all exposed to aluminum all the time. The water we drink has aluminum in it. The food we eat also has aluminum in it.”
The vaccines add only small amounts of aluminum (about 8 mg total) to the body after the childhood vaccination schedule is completed. Offit said that during the first 18 years of life, people routinely consume about 400 milligrams of aluminum naturally.
“I don’t know why there’s so much concern,” said Rajesh Gupta, a former FDA vaccine scientist. “Aluminum is distributed throughout the body. It is eventually excreted through the kidneys and into the urine. So, aluminum does not stay in the body.”
How it works
The aluminum in the vaccine is not a foil or metal. These are compounds of aluminum salts, such as aluminum hydroxide or aluminum phosphate, which help make vaccines more effective.
This is a bit like zinc in cold tablets. Patients do not swallow chunks of metal, but instead ingest zinc salts that dissolve safely in the body.
In vaccines, these aluminum salts provide additional stimulation to the immune system so that it learns to recognize target germs more effectively.
When injected, the vaccine stays near the injection site and causes mild, short-term inflammation that summons immune cells. These cells pick up vaccine antigens, which are harmless pieces of viruses or bacteria, and transport them to nearby lymph nodes. From there, the supplement presents itself to those around it like a wanted poster, allowing the body to quickly identify and destroy germs.
Harm HogenEsch, a professor of immunopathology at Purdue University’s College of Veterinary Medicine, said aluminum adjuvants are only effective when injected into the same spot as the vaccine component they are intended to boost, helping nearby immune cells recognize the germ. If the two injections are placed in different places, “you won’t see the effect,” he said.
In response to Kennedy’s claims, scientists say that anything that acts as an adjuvant can, in principle, promote allergic reactions. But this doesn’t mean aluminum-boosted vaccines turn children into food allergy time bombs. The antigens in the vaccine, such as hepatitis B surface antigen or HPV protein, are not allergens, and no food proteins are added to the vaccine.
animal testing
Animal studies form the basis of Kennedy’s claim that aluminum adjuvants in vaccines may cause allergies. In these experiments, scientists intentionally sensitize rats or mice by injecting them with food proteins mixed with aluminum. Aluminum enhances the immune response but does not cause allergies on its own.
“This is the basis of many experimental mouse models, where we sensitize mice by injecting them with food allergens along with aluminum supplements,” HogenEsch said. “I don’t know what food antigens are in the vaccine, so I can’t really see how this could happen.”
Ross Kedl, professor of immunology and microbiology at the University of Colorado Anschutz School of Medicine, went further, noting that there is no plausible route by which the vaccine could cause peanut allergy. “Someone would have had to mix the peanut protein with the actual vaccine before injecting it.”
Stefan HE Kaufmann, director emeritus of the Max Planck Institute for Infection Biology in Berlin, said that results in mice often do not match those in humans because “mice are much more prone to allergic reactions than humans.” In other words, what looks dramatic in rodent studies does not automatically apply to the human immune system.
And in this case, “it is important to distinguish how aluminum reacts in laboratory animals and humans,” Kaufmann said.
human research
In addition to animal models and theoretical scenarios, scientists have been working hard to find harmful signals in large-scale human data sets.
In 2023 research A small increase in asthma was reported in children exposed to aluminum before age 2, but this association disappeared in further analysis, according to the Vaccine Safety Datalink, a joint CDC effort.
“That paper was heavily criticized,” Offit said. “When we controlled for breastfeeding, the association between asthma and receiving aluminum-adjuvanted vaccines disappeared.”
“It should never have been published,” he said.
False signals are common when mining large databases for dozens of outcomes, said Kathy Edwards, professor emeritus of pediatrics at Vanderbilt University.
“Just by the rule of percentages, when you look at hundreds of different things, some of them may appear to have a signal,” she said. “The whole RFK Jr. assessment is really prone to cherry picking. People need a basic understanding of statistics to interpret it,” she added.
Shortly after the 2023 U.S. study results gained attention, scientists at the CDC contacted Anders Hviid, director of epidemiology research at the Statens Serum Institut in Copenhagen, Denmark, to see if his team could replicate the work.
“It makes sense to try to replicate all kinds of results from different data sources,” Hviid said.
Hviid’s nationwide Danish study We followed 1.2 million children over 20 years using linked national health registries that record all immunizations and diagnoses.
“Our health system is quite egalitarian. It’s free and universally accessible. And everyone is registered in a national register,” he said. Study results: There was no increased risk of these conditions associated with increased amounts of aluminum received from the vaccine.
rare bump
Doctors have recorded one real-life reaction to aluminum supplements. Itchy nodules appear at the injection site, and these are called “pruritic granulomas.” These small bumps are so rare that most allergists and pediatricians never see a single case.
This reaction “doesn’t lead to anything bad and isn’t really associated with anything other than a local stimulus,” Edwards said.
Researchers believe these bumps represent a localized immune response (meaning they occur only at the injection site and not a systemic allergy). This is very different from the type of immediate allergic reaction that people treat with antihistamines. These include reactions triggered by food or bees, when histamine, the body’s own alarm signal, floods the system within minutes, causing hives, swelling or difficulty breathing. Kedl said distinctions are often lost in public debate.
Eliminate aluminum adjuvant
For many experts, the real question is not only whether aluminum is safe, but what happens to the entire anti-virus program if aluminum adjuvants are removed. For many modern vaccines that rely on a single purified protein, including diphtheria, tetanus toxoid, hepatitis B, and HPV, adjuvants are important.
Edwards said it’s not realistic to simply switch to a different supplement.
“They all build on each other,” she said. Once a vaccine is proven to be effective and becomes the standard of care, the new or updated version is typically no longer tested against a placebo group of people who should have received the vaccine. Instead, it is tested against existing products. That is, each approval depends on the previous one.
Key childhood vaccines will probably have to be reformulated, and large-scale clinical trials will need to be repeated to prove that new products are safe and effective. Meanwhile, production gaps and shortages will have to be managed for potentially years while manufacturers and regulators restart, while leaving more room for diseases such as whooping cough, hepatitis B and HPV-related cancers to spread.
“Aluminum adjuvants have reached a sweet spot in that they are effective in inducing strong antibody responses that protect the vaccines used,” HogenEsch said. “Trying to get rid of them is frankly quite foolish.”
century of safe use
DTaP, hepatitis B, and HPV vaccines all contain aluminum adjuvants and have been used for nearly 100 years. Large-scale studies have shown no association between aluminum and systemic allergic disease.
“We have been using aluminum adjuvants in vaccines for decades,” Edwards said. “I have grandchildren. All my grandchildren have been vaccinated. And I’m not worried about their safety.”
If aluminum is cast incorrectly as villains and vaccine uptake falls, experts warn the results may not be theoretical. That means more measles outbreaks in schools, more meningitis outbreaks in college dorms, and more young adults dying from cancers that could have been prevented with HPV shots.
In their view, the real risk is not the trace metals that children are already exposed to every day. This would reverse the protection that aluminum-boosted vaccines have provided for generations.
That’s the compromise Offit wants parents to see. “The choice not to get vaccinated is not a risk-free choice,” he said. “Taking other risks is just a choice.”
