Ivermectin Is a 'Near-Perfect' COVID Prophylactic
Bret Weinstein, an evolutionary biologist and podcaster, called ivermectin a 'near-perfect COVID prophylactic' and claimed that its suppression was the result of institutional corruption. BBC fact-checks and reviews of high-quality studies showed that ivermectin demonstrates no effectiveness against COVID-19 in rigorous trials.
What we know
Bret Weinstein is a former evolutionary biology professor who left Evergreen State College in 2019 under controversial circumstances and subsequently built a million-listener podcast, DarkHorse, together with his wife, biologist Heather Heying. While his academic specialism - evolutionary biology - is legitimate, Weinstein pivoted during the pandemic to epidemiology and virology, fields in which he has no formal expertise.
His most controversial claim: that ivermectin is a 'near-perfect COVID prophylactic', and that institutions (the WHO, FDA, and CDC) are deliberately suppressing this information in the financial interests of pharmaceutical companies. On the DarkHorse podcast, Weinstein hosted Pierre Kory, a physician who promoted ivermectin, and together they developed a narrative of systemic institutional corruption. The Decoding the Gurus podcast analysed that episode and documented a series of claims unsupported by evidence.
BBC Reality Check examined the studies cited by ivermectin advocates. Its conclusion: many of those studies were of extremely low quality, and some showed clear signs of data manipulation - particularly the controversial Elgazzar study, which was retracted over fraud concerns. When only rigorous, well-controlled studies are included in meta-analyses, there is no evidence of ivermectin's effectiveness against COVID-19.
Vice documented a more serious case in 2024: Weinstein used his podcast to promote AIDS denialism, claiming that the theory attributing AIDS to party drugs (poppers) rather than the HIV virus was 'surprisingly compelling.' That theory, known as the Duesberg hypothesis, was debunked as far back as 1988 at a panel featuring all leading AIDS researchers, including Anthony Fauci. There is no scientific debate about the cause of AIDS. Weinstein arrived at these ideas through reading an RFK Jr. book - what Vice described as an 'unholy turducken of misinformation' that subsequently reached millions of listeners.
Weinstein consistently defends himself by claiming he is 'merely asking questions' and applying an 'evolutionary lens' to institutional behaviour. His critics point out that evolutionary biology provides no methodological tools for evaluating clinical studies on antiviral drugs.
Common claims
- Ivermectin is a near-perfect COVID prophylactic.False - rigorous studies do not confirm its effectiveness
- Institutions are deliberately suppressing information about ivermectin.Not supported - an interpretation built on a chain of assumptions
- HIV is not the cause of AIDS; party drugs are.False - debunked since 1988
- Weinstein is a relevant expert for evaluating COVID treatments.Misleading - his specialism is evolutionary biology, not epidemiology or virology