The Daily Mail reported in February how Health and Human Services (HHS) Secretary Robert F. Kennedy Jr. was seen taking a substance some observers believed to be methylene blue.

While methylene blue is believed by some to improve health, autopsy results have shown some curious findings. 

Internal organs showed a bluish or turquoise tinge

According to the Daily Mail, researchers at University Hospital Frankfurt in Germany examined the bodies of 11 people who had been treated with methylene blue.

They found that all of the individuals had internal organs that exhibited a bluish or turquoise tinge, including their hearts and brains.

The newspaper noted that all of the individuals died from causes unrelated to methylene blue, a synthetic dye that is sometimes used to treat malaria and methemoglobinemia.

It can also be administered to improve blood flow and oxygen delivery during emergencies in which conventional measures have failed.

Mel Gibson claims that friends used methylene blue to treat cancer

What's more, a growing number of people believe that methylene blue can improve brain function and mitigate mental health problems.

Newsweek also reported earlier this year that actor Mel Gibson told podcast host Joe Rogan that several of his friends have used methylene blue to successfully treat cancer.

What is RFK Jr. putting in his drink…?? pic.twitter.com/R9ZXmwmfVC

— American AF 🇺🇸 (@iAnonPatriot) February 5, 2025

"I have three friends. All three of them had stage four cancer. All three of them don't have cancer right now at all—and they had some serious stuff going on," the actor stated.

What's more, investor, author and social media influencer Bryan Johnson announced in March that he had begun taking methylene blue for its purported wellness benefits.

FDA warns against use of methylene blue by those taking antidepressants

Yet neuroscientist Anne-Sophie Fluri told the Daily Mail that claims of methylene blue's efficacy are largely derived from experiments on rodents and in petri dishes rather than human trials.

What's more, the Food and Drug Administration (FDA) released a statement in 2011 warning that methylene blue can cause serotonin syndrome among those taking antidepressants.

"Because methylene blue is not an FDA-approved drug at this time, and limited data exist regarding its use in various settings, it is not known whether there is a risk of serotonin syndrome in patients taking serotonergic psychiatric medications who are given methylene blue by other routes (e.g., orally or by local tissue injection) or at intravenous doses lower than 1 mg/kg," the statement read.