US health chief based vaccine cuts on misinformation, researchers say

US Health and Human Services (HHS) Secretary Robert F. Kennedy, Jr. speaks about the sending of warning letters to companies for illegally marketing products containing 7-hydroxymitragynine, also known as 7-OH, as part of their actions combatting opioids, during a press conference at HHS headquarters in Washington, DC, on July 29, 2025. (Photo by SAUL LOEB / AFP)