lack of scientific evidence pointing to the effectiveness of such a treatment. The website was taken down in April 2021 after the Food and Drug Administration sent a warning letter. In May 2021, Mercola announced he would remove mentions of COVID-19 from his websites, blaming Bill Gates and "big pharma". Mercola claimed that inhaling 0.5–3% hydrogen peroxide solution using a nebulizer could prevent or cure COVID-19. A tweet from Mercola advertising this method was removed from Twitter on April 15, 2020, for violating the platform rules, but he continued to make these claims on other platforms, including during a speech at a major conference of anti-vaccination activists in October. He was warned by the US Food and Drug Administration (FDA) in February 2021 for selling fake COVID-19 cures. In March, the Center for Countering Digital Hate named Mercola as one of the 12 most prominent sources of COVID misinformation in a report later cited by US Surgeon General Vivek Murthy. In September his accounts on YouTube were removed by the company for breaking their policies on COVID-19 misinformation. Mercola then moved some of his content to Substack. According to Imran Ahmed, CEO of the Center for Countering Digital Hate, Mercola's content is "so bad no one else will host it". On September 29, 2022, Mercola filed suit against Google, who owns YouTube, alleging they violated their provision of giving the subscriber an opportunity to remove any of their content to comply to a new policy. Mercola co-authored a book with Ronnie Cummins, the founder of the Organic Consumers Association, titled The Truth About COVID-19: Exposing the Great Reset, Lockdowns, Vaccine Passports, and the New Normal: Why We Must Unite in a Global Movement for Health and Freedom. The McGill Office for Science and Society described the book as "in effect, summarizing the misinformation surrounding COVID-19" and "monumentally wrong". Senator Elizabeth Warren wrote to Amazon demanding they do more to tackle misinformation about COVID-19 and stop promoting Mercola's book as a bestseller. Mercola, was cited in a February 2022 Stanford University report along with Robert W. Malone and Simone Gold, as prominent pseudomedical influencers (PMIs) who were among the top spreaders of COVID-19 misinformation. Using a number of social media accounts, including WhatsApp, Telegram, BitChute, and Facebook accounts in both English and Spanish, Mercola's followers numbered over 4 million. The Virality project listed 30 incidents of Mercola spreading misinformation. Amazon gave