This wave revives an old but visually powerful claim: that polio vaccines contain “deadly toxins”—aluminum, mercury, thimerosal, formaldehyde—that cause neurological damage, sterility, or cancer. Viral threads on X displayed colorful ingredient lists with side effects listed in bold red, turning complex chemistry into a fear poster. YouTube hosts rebranded these as “poison injections,” pulling in parents who were searching for vaccine safety content. The storyline spread further when translated into French, Spanish, and Portuguese memes, with Telegram groups in Brazil recycling the English graphics as local “evidence.” Figures like Valerie Anne Smith and Chris Baker are cited to lend pseudo-authority, while some posts link the “toxins” to autism or autoimmune disorders, weaving them into a broader “vaccines as poison” ideology. The narrative grows by combining medical-sounding details with dramatic imagery, presenting familiar ingredients as if they were exotic threats.