Recently, RFK Jr. went viral for adding drops of a mysterious blue liquid from a vial to his drink. The moment was captured by another passenger flying on the same airplane as President Trumps HHS Secretary.

The substance has sparked widespread speculation online about its composition and purpose. Medical experts have identified it as methylene blue, a compound used in medical treatments for conditions such as methemoglobinemia—where blood cannot properly release oxygen.

Methylene blue is also being studied for potential benefits including anti-viral activity and applications in neurological health. It has been reported to enhance mitochondrial function, improve cognitive performance, and act as an antioxidant.

The U.S. Food and Drug Administration states that supplements are not intended to diagnose, treat, cure, or prevent any disease.