A clip of RFK Jr. putting a mysterious blue liquid in his drink recently went viral [1]. The blue liquid is probably methylene blue, a compound that has suddenly entered the spotlight. It is touted as a game-changing therapy that can slow the process of aging and extend lifespan [2].
Below is a look at why it is generating so much excitement and what the current research actually shows.
Table of Contents
3. Implications
4. Alternatives
Section 1: Why the excitement?
Even before RFK was spotted putting it in his drink, methylene blue had been steadily growing in popularity among biohackers and health enthusiasts. How did we get here?
Methylene blue has a fascinating history. It was discovered in 1876 by a German chemist looking for synthetic dyes for the fabric industry. Not long after, a German doctor was using it to stain tissues so they would show up better under the microscope. He found it targeted certain kinds of cells and tissues. This led to its early use in treating malaria. Methylene blue was the first fully synthetic drug — so it has been around a long time.
But how did we get from treating malaria to the idea that methylene blue might help fight aging? There were some intriguing research results that pointed in this direction.
For instance, researchers published results in 2008 from an investigation of the effects of methylene blue on human cells in the lab [3]. They found the compound made cells survive through many more generations than is normal. This appeared to be due to how methylene blue affects the mitochondria — the cell's power plant. It increased energy production and protected cells from damage.
Problems with mitochondria and cell damage from oxidative stress are important mechanisms in aging. This was a promising result suggesting methylene blue could potentially support cellular health over time.
Another study added weight to this idea. It investigated the impact of methylene blue on the brains of rats. The rats in the study had a condition that causes their mitochondria to not work as well. This condition results in damage to brain tissue and symptoms like seizures. Treatment with methylene blue appeared to help. It prevented seizures and protected against cellular damage [4].
Again, the key mechanism of methylene blue appeared to be related to mitochondria. It stimulates greater energy production and helps eliminate free radicals — unstable molecules that damage cells.
Given these kinds of experimental results, researchers wondered if methylene blue could extend lifespan in living organisms.
A trial was conducted through the Interventions Testing Program, which tests supplements and diets specifically to see if they extend lifespan. They tested methylene blue in mice. Overall, lifespan was not statistically different for mice treated with methylene blue. The maximum lifespan seen in female mice did increase by 6% [5]. However, researchers concluded that the study did not support the idea that methylene blue is an effective agent against aging — the effect size was too small and limited to one sex.
Does this mean methylene blue is not going to help with lifespan? Not necessarily. Humans are very different from mice.
Consider the example of omega-3 fatty acids. Just as with methylene blue, experimental results led scientists to think omega-3s could help slow down aging. The Interventions Testing Program put that theory to the test. They found no significant longevity benefits of fish oil — a potent source of omega-3s [6].
Yet omega-3 research in humans tells a different story. From a large trial called the VITAL trial, involving over 25,000 people, the group who took omega-3 had an unexpectedly high 28% reduction in the risk of having a heart attack compared to the group who took the placebo [7]. The mouse data did not predict this human benefit.
So we have found solid benefits for omega-3s in human trials — benefits that never showed up in the animal models. This is a useful reminder that animal studies alone cannot tell us how a compound will perform in people. It is entirely possible that methylene blue could one day show meaningful human benefits, just as omega-3s did. But the animal data is not sufficient grounds to assume that will happen.
Section 2: Human Research
Is there something similar to be found with methylene blue in human trials? Here is what the current evidence shows.
One trial looked at the effects of methylene blue on the brain. Researchers scanned participants' brains while they performed tasks that tested their attention and short-term memory. Those who took methylene blue showed increased brain activity in several regions. They also performed better on the memory test [8].
Another study also related to brain function. Methylene blue was given to participants who were undergoing therapy for claustrophobia. The therapy relied upon forming new memories.
Researchers found methylene blue appeared to strengthen the formation of new memories [9].
Both of these studies showed positive effects of methylene blue on brain function.
A third study took the form of a meta-analysis, examining methylene blue in Alzheimer's treatment. The connection to Alzheimer's comes from the same mitochondrial mechanism: problems with mitochondria in brain cells are a key contributor to Alzheimer's disease, and methylene blue appears to support mitochondrial function.
The authors of the meta-analysis concluded that results with methylene blue so far are mixed [10]. It shows promise, but existing studies have limitations including small sample sizes, short treatment durations, and dosage differences. More research is needed to understand its potential, mechanisms, and safety profile.
There are some interesting initial findings in human studies. They support the idea that methylene blue impacts mitochondria, which could in turn benefit the health of cells — in the brain and elsewhere. But no study has yet looked specifically at the effects of methylene blue on aging in humans. Its impact in that area remains unknown.
Section 3: Implications
Given that there is a plausible mechanism for methylene blue in the body, and a theoretical link to lifespan, the question arises: why not try it? What is there to lose?
This is a fair question. The current lack of evidence has not stopped companies from making supplements containing methylene blue that promise anti-aging effects [11].
But as with any drug, methylene blue carries potential risks.
For example, methylene blue can lead to a dangerous condition called serotonin syndrome [12]. This occurs when too much serotonin accumulates in the body. It can happen because methylene blue can block serotonin from being cleared from circulation — which is the same mechanism as many common antidepressants. When serotonin levels are too high, the results can be life-threatening. Taking methylene blue alongside serotonergic medications therefore carries serious risk.
There is also a risk related to red blood cells. Some people carry an inherited condition — glucose-6-phosphate dehydrogenase (G6PD) deficiency — in which their bodies cannot produce enough of a specific enzyme. When these individuals take methylene blue, it can alter their red blood cells so they can no longer carry oxygen effectively. This is a very serious outcome. Even people without this inherited condition can be affected at high enough doses of the compound.
Methylene blue can also cause a range of side effects, from joint pain to loss of taste [13].
A further complication: there is no established therapeutic dose. Researchers do not yet know what level of methylene blue to use when trying to achieve a particular health outcome.
There is also a product-quality concern. Methylene blue supplements sold online are often not independently tested. There is no guarantee that what the label states is actually in the supplement, and there is the possibility of unwanted contaminants such as heavy metals.
The current evidence does not support using methylene blue for general health or aging purposes. No human aging trials exist, the risks are real and documented by the FDA, and no safe therapeutic dose has been established for this use case.
Section 4: Alternatives
Fortunately, there are interventions with strong, replicated human evidence for supporting a longer healthy life.
A notable study modelled the effect of dietary changes on life expectancy. It found that meaningful changes to diet can add a substantial number of years to a person's life. Changes made at age 20 added between 11 and 13 years on average. Changes at age 60 added over 8 years. Even changes made at age 80 led to an average of an extra 3½ years of healthy living [14].
What changes were involved? Switching from a standard Western diet to an optimal one — meaning a much higher intake of whole grains, legumes, fish, fruits, vegetables, and nuts, and a sharp reduction in processed meats, sugary drinks, and refined grains [14].
The change to eating more legumes alone was estimated to be responsible for a gain of up to 2½ years [15]. In other words, one of the most powerful dietary adjustments for supporting a longer life is something that rarely appears in supplement marketing material — beans. The evidence on diet as a modifiable determinant of health outcomes is extensive and well-replicated.
Exercise is another powerful lever. A large cohort study followed over 100,000 people for 30 years. It found that those who met targets for moderate physical activity had a 19% to 25% lower risk of death [16]. Those who achieved targets for vigorous physical activity saw similar risk reductions [17].
A healthy diet and regular exercise are the most evidence-supported approaches to adding healthy years to life. The data is robust, the benefits are well-replicated, and there are no dangerous side effects.
Research also points to nutritional supplementation as a potential support for cognitive health — one of the areas where methylene blue has been studied. The large COSMOS-Mind trial found that taking a well-formulated multivitamin-mineral supplement was associated with improvements in cognition, memory, and executive function [18]. This is one of the strongest multivitamin trials published to date.
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Reference List
1. https://x.com/i/status/1887232439770087608
2. https://alphahormones.com/methylene-blue-mitochondrial-health/methylene-blue-mitochondrial-health/
3. https://faseb.onlinelibrary.wiley.com/doi/epdf/10.1096/fj.07-9610com
4. https://www.sciencedirect.com/science/article/abs/pii/S0197018606002531
5. https://pmc.ncbi.nlm.nih.gov/articles/PMC3954939/
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC5032683/
7. https://www.mayoclinicproceedings.org/article/S0025-6196(20)30985-X/fulltext
8. https://pmc.ncbi.nlm.nih.gov/articles/PMC5084971/
9. https://pubmed.ncbi.nlm.nih.gov/25018057/
10. https://pmc.ncbi.nlm.nih.gov/articles/PMC10631450/
11. https://www.livegood.com/methyleneBlue
14. https://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1003889
15. https://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1003889
16. https://www.ahajournals.org/doi/full/10.1161/CIRCULATIONAHA.121.058162
17. https://www.ahajournals.org/doi/full/10.1161/CIRCULATIONAHA.121.058162
18. https://alz-journals.onlinelibrary.wiley.com/doi/10.1002/alz.12767
