She looks like somebody’s grandmother, warm and reassuring, with a lifetime of homespun wisdom to share. That, in many ways, is what makes Barbara O’Neill so persuasive—and so worrying to the doctors, scientists, and public health experts who have spent years watching her career. O’Neill, a 73-year-old Australian who describes herself as a naturopath and nutritionist, lectures across the world on what she calls “natural self-healing.” But her version of natural health comes with claims that mainstream medicine flatly rejects: that cancer is a fungus that can be treated with bicarbonate of soda, that vaccines have caused epidemics of autism and cot death, and that pregnant women carrying Strep B can safely skip antibiotics. These are not harmless fringe ideas. In 2019, Australian health authorities investigated her and concluded that her advice was not just misleading but dangerous, permanently banning her from providing any kind of health service in the country. Yet the ban stops at the water’s edge. Now O’Neill is due to appear at a series of events across the UK and Ireland, from a luxury retreat in Cheshire to a festival at Glasgow University Union, and the experts who have watched her career are desperately trying to warn people before she takes the stage again.
That warning comes in the form of an open letter, organised by Dr David Robert Grimes, a science communicator and biostatistics expert at Trinity College Dublin, and sent to every venue where O’Neill is scheduled to speak. The letter is blunt. It calls O’Neill “a leading vector of medical misinformation,” and describes how she repeatedly makes “misguided medical assertions,” offers “unqualified advice,” and engages in “abject demonisation of conventional medical treatment.” The signatories include some of the most respected names in British and Irish medicine and research: the chief executive of Breakthrough Cancer Research, the head of Trinity College Dublin’s medical school, a fellow of the Royal Society, and a professor of psychology at Cambridge. Their concern is not abstract. As Grimes put it, “Medical misinformation kills.” He and his colleagues have seen the real, tragic harm that health fictions can inflict on vulnerable people, and they fear that O’Neill’s presence in respectable venues lends her an illusion of legitimacy—what the letter calls “leeching off an illusion of legitimacy afforded to her by the surrounds of your respectable establishment.” The letter also notes that O’Neill charges thousands of dollars for retreats and telephone consultations, turning fear and confusion into profit. And the wider public shares their anxiety: recent findings from the UK’s Academy of Medical Sciences show that 67% of British adults consider health misinformation a serious problem, and 89% believe it puts lives at risk.
O’Neill’s history makes those fears easy to understand. In 2019, after a lengthy investigation, the New South Wales Health Care Complaints Commission concluded that she did not recognise how she was misleading vulnerable people, including mothers and cancer sufferers, by presenting highly selective information. The commission found that her misinformation had “real potential to have a detrimental effect on the health of individuals,” especially because she actively discouraged mainstream treatments like chemotherapy, antibiotics, and vaccinations. As a result, she was permanently barred from providing any health service, whether voluntarily or for money, and that order remains enforceable across all of Australia. But international borders are harder to police. The ruling did not stop O’Neill and her husband, Michael, from packing up and taking her message overseas. She has already given seminars in the UK, including at the luxury golf resort Trump Turnberry in Scotland, and has built a devoted following among people who feel let down by conventional medicine or who are simply searching for gentler, more “natural” answers. Her events often blend health lectures with a kind of lifestyle appeal—a chance to escape, to reset, to hear someone say that your body can heal itself if only you trust it. That message is seductive, especially for people facing serious illness who have been told there is no cure, or for parents anxious about the sheer number of vaccines their children are offered.
The latest round of events is just as polished. In early October, O’Neill is booked to lead a five-day retreat at Cranage Estate in Cheshire, an elegant venue that usually hosts weddings and corporate events. The event is called “A Taste of Misty Mountain,” and alongside lectures with titles like “What Really Does Cause Disease,” “The Science of Breath,” and “The Immune System,” her husband Michael will give a talk titled “Barbara Under Attack.” Tickets cost £700, and the price includes a dinner dance—an odd combination of wellness seminar and social occasion, but one that seems designed to make attendees feel they are part of a community rather than a patient group. Another multi-day event, organised by the Christian health and wellness group Balm of Gilead, is scheduled for mid-October at the City North Hotel and Conference Centre in Gormanston, Ireland. Then O’Neill and her husband are set to headline the “Founders and Future” festival at Glasgow University Union, where the event website proudly announces that the pair will be “headlining the main stage.” The venues, for their part, have responded to the experts’ letter with carefully worded statements. The De Vere Cranage Estate said it merely hosts events for private clients and would not normally become involved in the content or opinions expressed at privately organised events. Glasgow University Union’s president said the events were not affiliated with or endorsed by the union board, and that external organisers are free to use the spaces as long as their activities comply with booking terms and the law. In other words, the venues are distancing themselves from the content while still taking the money.
Michael O’Neill, who acts as his wife’s defender and business partner, has dismissed the criticisms as ideological persecution. He told the Guardian that the Australian ban had “serious legal flaws” that were under investigation, and that there were “political moves” to place the health regulator under investigation for bias against natural wellness practitioners. He also claimed that Barbara had never received a single complaint of harm from a patient, and that the complaints against her were based on “supposition, not facts.” He went further, alleging that the HCCC is largely funded by pharmaceutical money and is a “seriously conflicted organisation.” These are serious charges, but they are not supported by any evidence presented in the regulator’s findings. The experts who have signed the letter are not convinced. Prof David Elliman, a consultant at Great Ormond Street Hospital and clinical adviser to the UK National Screening Committee, said plainly that the science does not support O’Neill’s suggestions, and that if people follow her advice instead of evidence-based medicine, “this will be dangerous and result in the death of some people.” He even said that, in principle, he would support a mandatory requirement for anyone offering paid health advice to state their qualifications. Prof Liam Smeeth, director of the London School of Hygiene & Tropical Medicine, offered a more nuanced view. He said he did not back banning speakers, because censorship can be counter-productive, and he strongly supports free speech as long as it does not incite violence or hatred. But he was equally clear that O’Neill’s claims are unscientific and that the potential for harm is great. “She’s trying to make a profit out of people’s understandable fears and confusion when it comes to serious health issues,” he said. “And that’s a terrible thing to be making money from.”
The New South Wales Health Care Complaints Commission, which took the unusual step of publicly confirming the ban, has also spoken out again. A spokesperson reminded people that the commission permanently prohibited O’Neill from providing any health services in 2019 after finding that she made dangerous claims unsupported by evidence and posed a risk to public safety. While the order does not apply overseas, the spokesperson urged anyone attending her events to be wary of health misinformation and to check any advice she gives with a registered health practitioner. That advice seems simple, but it cuts to the heart of the problem. O’Neill thrives because she offers certainty in a world where medicine often has to admit uncertainty. She tells people they can take control of their own health without needles, without pills, without doctors. For someone with a chronic illness, or a parent terrified by the sheer volume of vaccines, that can feel like liberation. But liberation based on falsehood is not freedom—it is vulnerability. The tragedy is that the people most likely to be hurt are the ones who trust her the most. They may skip antibiotics for a dangerous infection, avoid chemotherapy for a treatable cancer, or leave their children unvaccinated against diseases that are only a plane ride away. The experts who signed the letter are not trying to silence a harmless eccentric; they are trying to protect people from a very real danger. As Grimes said, they hope that making people aware of the reality will mitigate her ability to inflict harm. In a world where misinformation spreads faster than ever, and where the consequences of a bad health choice can be measured in lives lost, that is not an academic concern. It is a public health emergency happening one retreat, one seminar, one reassuring lecture at a time.