Longevity enthusiasts are buzzing after reports surfaced that Robert F. Kennedy Jr. may be a fan of methylene blue. President Donald Trump’s pick to lead the Department of Health and Human Services was recently filmed adding mysterious blue droplets to his glass mid-flight.

Robert F. Kennedy Jr. is going viral on social media after he was caught on camera adding a mysterious blue liquid to his in-flight beverage, and internet sleuths believe they know what it is. The leading theory among X users is that the prospective health secretary was dosing his drink with methylene blue.