09-23-2026
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Pfizer’s former head of European toxicology went back through the testing behind the COVID shots. What he says should have been done versus what was actually done is the story he spent years documenting.
Dr. Helmut Sterz knows this process from the inside. He spent more than 20 years as a high-level pharmaceutical toxicologist, and in 2001, Pfizer appointed him to lead two of its European toxicology centers. When Pfizer announced that a COVID vaccine could be developed in a matter of months, Sterz immediately began asking the kinds of questions his career had trained him to ask.
Where was the toxicology?
When he examined the available documentation, Sterz says he found a safety strategy unlike anything he would have expected during his pharmaceutical career.
That became the foundation of Vaccine Mafia: Pfizer’s Former Chief Toxicologist Proves How Toxic Substances Were Unlawfully Sold to Us as a Solution for COVID-19.
Sterz takes us directly into the preclinical research that most people have never seen. He explains what caught his attention in the animal studies, why dose selection mattered, and why questions involving pharmacokinetics, repeated exposure, reproductive toxicity and the manufacturing process became impossible for him to ignore.
His concern is not simply that he disagrees with how a study was designed. He questions whether some of the research necessary to understand the risks of a product intended for widespread and repeated use was ever adequately performed before it reached the public.
And he knows what that research is supposed to look like.
Sterz spent his professional life evaluating pharmaceutical toxicity. He worked on methods used to assess toxicological effects in pregnant laboratory animals and their offspring. He led toxicology departments. Eventually, he was running Pfizer toxicology centers in France and England.
So when he says he began seeing holes in the development program, I wanted to know exactly what he saw.
The deeper Sterz investigated, the larger his questions became. He began looking beyond the laboratory at the relationship between pharmaceutical companies and the institutions responsible for research, regulation, public health policy and oversight. That investigation ultimately led to the provocative title Vaccine Mafia and his argument that Pfizer represents only one part of a much larger story.
Sterz didn’t suddenly begin asking these questions when his book appeared. He says he had been documenting his concerns and circulating papers among friends, family members and former colleagues for years.
Their reaction surprised him.
Even people with advanced scientific training often had little interest in examining what he was sending them. Sterz discovered that evidence alone was not necessarily enough to make someone reconsider what they had already decided to believe. He even watched that happen inside his own family.
That experience became part of the reason he kept writing.
By 2023, the papers and research he had accumulated were becoming a book. New information continued appearing, and Sterz kept adding to the manuscript until his editor finally told him he had to stop researching and publish it.
The result goes considerably deeper than we could go in one conversation.
Vaccine Mafia examines the preclinical toxicology in detail, comparing the studies Sterz believes should have been conducted with the studies that were actually performed. Our conversation gets to something different: what first made a veteran pharmaceutical toxicologist suspicious, what he discovered as he continued digging, and why he became convinced that the story needed to be documented.
I’ve spent more than two decades researching vaccines, and by July 2021, I had documented 40 mechanisms through which I believed the COVID shots could cause serious harm. Sterz approached the issue from another direction entirely: the toxicology laboratory and the pharmaceutical development process itself.
That makes this conversation especially important.
Before the world was told these products were safe, what did the toxicology actually show?
And perhaps just as important: what wasn’t studied?
Meet our Guest
Dr. Helmut Sterz spent decades working in the field responsible for answering one of the most important questions in pharmaceutical development: What can this product do to the body before it reaches human beings?
Sterz studied veterinary medicine, earned a doctorate in virology, and has been certified as a specialist veterinarian in pharmacology and toxicology since 1981. His scientific work included improving methods used to evaluate toxicological effects in pregnant laboratory animals and their offspring.
Beginning in 1988, he held senior positions as head of toxicology within pharmaceutical companies.
Then Pfizer put him in charge.
In 2001, Sterz was appointed head of two Pfizer European toxicology centers, one in France and another in England, where he remained until retirement.
When the COVID response began, that background shaped the questions he started asking about the rapid development of the new vaccines. Sterz began studying the available research and documenting his concerns, work that eventually became Vaccine Mafia: Pfizer’s Former Chief Toxicologist Proves How Toxic Substances Were Unlawfully Sold to Us as a Solution for COVID-19.
His focus is unusually specific: the preclinical toxicology most people never see, what he believes should have been tested, what was actually tested, and why the difference matters.
Website
Book: https://amzn.to/3TOjyft
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