RFK, Jr. appears to have been filmed putting putting Methylene blue in his drink in American Airlines first class. The drink was probably water.

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

— American AF (@iAnonPatriot) February 5, 2025

Methylene blue was originally developed as a dye. It has several medical applications. You can buy it on Amazon.

It’s used in treating methemoglobinemia, acting as an electron donor to reduce methemoglobin in the blood back to hemoglobin. It’s used as a stain for medical diagnostic procedures, coloring tissues or fluids to make them more visible during lymph node mapping or leak detection.

At lower doses, some studies suggest medical benefits – for treating neurodegenerative disorders, psychiatric conditions, and as an “anti-aging” protocol – but those are largely ‘pre-clinical’ to put it generously. In higher doses, methylene blue can be neurotoxic and may interfere with mitochondrial function.

It's called Methylene Blue, USPA 2% grade, and he is taking too much in the dropper dosage, especially for that amount of water. You need at least 12 ounces of water.

RFK Jr, go easy man.

You only need to dose once every two to three months.

But unless you have something else…

— Gray Savage (@WhiteHatCereal) February 5, 2025

The most common side effect is that you’ll pee blue. It can also turn skin blue, and cause headaches and dizziness. When combined with serotonergic medications, such as SSRI, it can cause excess serotonin which can be life-threatening.

Methylene Blue!
Never leave home without it.
I take 20 drops with flavored water to help cut the bitterness.
Feel great. Massive benefits.
Only downside, you’ll pee blue. pic.twitter.com/GXMVPVo2Av

— PVPete (@GJ_Pete) February 5, 2025

When I was a freshman in college I got sick at a debate tournament in Salt Lake City. In order to put myself together for the quarterfinals, much coach gave me something to take in a dropper that made me pee blue. I never knew what he was (and he’s since passed away), but that side effect made me think that it was the textile dye that first became widely available in the late 19th century. For purely placebo reasons I felt well enough to win.