Recently, RFK Jr., who serves as the U.S. Secretary of Health and Human Services under President Trump, went viral for adding drops of a blue liquid from a vial to his drink during a flight. The moment was captured by another passenger on the same airplane.

Online speculation quickly arose about what RFK Jr. had added to his beverage. Medical experts identified Methylene Blue as the most likely compound, which is used in medical treatments for conditions such as methemoglobinemia—a blood disorder that impairs oxygen delivery.

Methylene Blue has been studied for potential health benefits including anti-viral properties and neuroprotective effects. Some research suggests it may help prevent neurological diseases like Alzheimer’s.

The compound also enhances mitochondrial function, improves cognitive performance, increases oxygen delivery to tissues, and acts as an antioxidant.

However, the U.S. Food and Drug Administration cautions that supplements should be used with care due to potential interactions and risks at high doses.

RFK Jr.’s use of Methylene Blue has drawn attention from health advocates, but medical professionals emphasize consulting a healthcare provider before starting any new supplement regimen.