In This Article:
Introduction
Key Benefits of Methylene Blue
Improved Mitochondrial Function
Methylene Blue for Brain Health, Dementia and Parkinson’s Disease
Mitochondrial-Specific Antioxidants Improve Skin Cell Aging
Methylene Blue for Viruses
Methylene Blue for Colon and Stomach (gastric) Cancer
Methylene Blue in Glioblastoma (Brain Cancer)
Methylene Blue and Ovarian Cancer
Methylene Blue in Prostate Cancer
Methylene Blue and Nitric Oxide: From Shock Rescue to Anti-Aging Modulation
1. Introduction
Methylene blue is the precursor molecule for hydroxychloroquine and chloroquine. It is a fascinating compound with a wide range of health benefits. Best known as a fish tank antiseptic and textile dye for blue jeans, it was actually the first synthetic drug in modern history, developed in 1876. Since then, we’ve discovered it has many really important medicinal benefits.
The first medical application of methylene blue was for malaria. In 1890, Paul Ehrlich, a scientist at the famous Charité Hospital in Berlin, Germany, discovered methylene blue inhibits an enzyme that weakens the malaria parasite.
Methylene blue remains an important part of the strategy’s used in hospitals worldwide due to its unique ability to counteract mitochondrial metabolic poisons. These are typically molecules that disrupt the flow of electrons in the complexes of the electron transport chain of the mitochondria.
In cases of carbon monoxide or cyanide poisoning, for instance, medical professionals administer methylene blue intravenously as a primary treatment. Today, it's gaining further attention in the natural health community for its ability to promote healthy skin, slow skeletal aging, support brain health and more.
2. What are the Benefits of Methylene Blue?
Methylene blue is a multifaceted compound with diverse uses, but its most notable impact is on how cells produce energy. It primarily works by interacting with the mitochondrial electron transport chain, which plays a vital role in cellular energy generation.
During normal cellular respiration, electrons from the food we eat are passed through a series of protein complexes within the mitochondria. This process, called the electron transport chain, ultimately results in the production of ATP, the energy currency of cells. In this chain, oxygen acts as the final electron acceptor.
What makes methylene blue special is its ability to accept electrons and transfer them directly to oxygen, effectively creating a shortcut in the usual electron transport chain. This alternative pathway can boost energy production, especially in situations where normal cellular processes are compromised or not working at full efficiency.
By enabling more effective electron transfer and energy generation, methylene blue has the potential to enhance various aspects of how cells function and overall health. This ability to interact with and optimize cellular energy processes is what makes methylene blue a topic of interest in both scientific studies and potential medical applications.
3. Improved Mitochondrial Function
One of the most exciting aspects of methylene blue is its potential to improve mitochondrial efficiency and increase cellular energy. This improvement in cellular energy production has wide-ranging benefits throughout your body. Whether it's healing, neurotransmitter production or any other cellular function, optimized mitochondria help your body perform at its best.
Even in healthy individuals, low doses can improve the body's energy production systems. It enhances oxygen use, mitochondrial function and ATP generation beyond normal levels, essentially fine-tuning the entire metabolic process. This means it serves as both a performance booster for cellular energy production and a remedy for metabolic disruptions.
Furthermore, methylene blue's impact on mitochondrial respiration is linked to broader positive effects. It stimulates your body to increase its oxygen-processing capabilities overall. Additionally, it influences blood flow dynamics, leading to improved blood supply to various tissues. These combined effects contribute to its potential as a metabolic optimizer.
4. Methylene Blue for Brain Health, Dementia and Parkinson’s Disease
Perhaps one of the most revolutionary benefits of methylene blue is for the prevention and treatment of dementia, neurodegenerative diseases such as Alzheimer’s and Parkinson’s, and neural injuries caused by stroke and traumatic brain injuries (TBIs).
A March 2024 review published in Reviews in the Neurosciences explores the use of methylene blue as a therapeutic agent for traumatic brain injury (TBI), which is characterized by damage to brain tissue from an external force. TBI damage leads to a cascade of neurodegenerative processes that continue long after the initial injury.
In biohacker circles, low-dose methylene blue is used as a nootropic, meaning a compound that helps improve cognitive function. However, while some promote sublingual or buccal application (under your tongue or on the inside of your cheek), the best way is to swallow it, as the acid in your stomach makes it more bioavailable.
Related: Best Natural Supplements for Dementia
However, one phase II trial lasting 6 months and two phase III trials lasting 15 months have tested formulations of methylene blue in Alzheimer’s, which have failed to support its efficacy (Expert Opinion on Pharmacotherapy 2020).
The doses used in the trials ranged from 69 to 250 milligrams per day. The “placebos” contained 8 milligrams per day in order to turn the subjects’ urine the same color.
An observational study nested in the two phase III trials plotted the cognitive decline scores at week 65 against the maximum concentration of methylene blue and its metabolites in the plasma of the 8 mg “placebo” members 3.5 hours after their first dose. It found that cognitive decline scores improved in the range of 0.3-0.5 ng/mL and then leveled off.
A 2015 study found that low-dose methylene blue – a century-old dye – and near-infrared light can protect neurons from degeneration by boosting cellular energy production. Both treatments share a common mechanism: They enhance mitochondrial respiration, the process that keeps neurons alive. Unlike high-dose drugs that often cause side effects, these interventions follow a hormetic principle: Low doses are beneficial, while high doses can be harmful.
5. Mitochondrial-Specific Antioxidants Improve Skin Cell Aging
It’s well-known that antioxidants are potent combatants that help protect the skin and slow aging. According to a study from the University of Maryland published in the peer-reviewed journal Scientific Reports (Nature 2017), methylene blue was better and safer than mitochondrial-specific antioxidants in reducing mitochondrial dysfunction and promoting new cell generation.
Researchers tested methylene blue using skin cells from healthy middle-aged donors and those diagnosed with a rare genetic disease, progeria, that causes children to age rapidly. Methylene blue outperformed three other antioxidants and improved age-related symptoms in the cells of both progeria patients and healthy donors.
Over the four-week experimental treatment, skin cells had decreased cellular damage due to oxidative stress, a reduced rate of cell death, and increased cell division. According to the researchers, the methylene blue stimulated mitochondrial health and addressed the root cause of skin aging.
“Our work suggests that methylene blue could be a powerful antioxidant for use in skin care products,” Kan Cao, senior study author and associate professor of cell biology and molecular genetics at the University of Maryland, said in a news release. “The effects we are seeing are not temporary. Methylene blue appears to make fundamental, long-term changes to skin cells.”
Not long after the study was published, Ms. Cao launched a line of skin care products based on the research. “Human aging is deeply connected to the function of the mitochondria and our cellular reproduction,” she said in a different press statement. “In fact, mitochondrial mutations [are associated] with many age-related diseases.”
6. Methylene Blue for Viruses
According to the research, many of the viruses that the public is taught to fcar arc quickly inactivated by methylene bluc, including Herpes, West Nile, Hepatitis C, Ebola, Zika, HIV, and COVID-19. (2 - 25)
And perhaps the most promising part is the startling increase in anti-microbial potency of methylene blue when combined with light therapy.
It turns out, the combination of methylene blue and specific wavelengths of red and near-infrared light poses an even more significant threat to the survival of all types of pathogens and harmful microorganisms.
7. Methylene Blue for Cancer
Methylene Blue for Colon and Stomach (gastric) Cancer
Dr. William Makis shared on X.com in September 2025:
IVERMECTIN, FENBENDAZOLE and METHYLENE BLUE Testimonial - Stage 4 Colon and Gastric Cancer patient with 12-19 months to live, is now Cancer Free! I received a short email today that made me very happy.
"In September 2022, I was diagnosed with Stage 4 Colon & Gastric Cancer and given 12-19 months to live. My Oncologist recommended surgery, chemo, radiation" "Instead, I took another path" "in April 2024, I was cancer free" Still cancer free as of September 2025.
"You've helped more people than you'll ever know. I'm living proof".
Methylene Blue in Glioblastoma (Brain Cancer)
Dr William Makis shared on X/Twitter in Feb 2025:
2013 Poteet et al - Reversing the Warburg Effect as a Treatment for Glioblastoma (PubMed).
"Here, we documented that methylene blue (MB) reverses the Warburg effect evidenced by the increasing of oxygen consumption and reduction of lactate production in Glioblastoma cell lines"
"Methylene Blue decreases Glioblastoma cell proliferation and halts the cell cycle in S phase."
Methylene Blue inhibits cell proliferation in both temozolomide-sensitive and -insensitive GBM cell lines (wow!!!)
Methylene blue (MB), synthesized in 1876, has been in clinical application for more than a century in diagnostic procedures and as a treatment of multiple disorders such as methemoglobinemia, malaria, ifosfamide neurotoxicity, and cyanide poisoning.
There is mounting evidence that MB enhances brain metabolism and exerts neuroprotective effects in multiple neurodegenerative disease models including Parkinson, Alzheimer, and Huntington disease In the current study we tested the hypothesis that reversal of the Warburg effect by MB inhibits GBM cell proliferation.
More than 90 years ago, Warburg hypothesized that cancers may be caused by increased glycolysis and impaired respiration based on observations that tumor tissue actively metabolizes glucose and produces excessive lactic acid while exhibiting a comparably low respiratory rate.
Recent findings suggest that reinstating normal oxidative phosphorylation in cancer cells may not only inhibit cell growth and proliferation but also impair the metastatic capacity of malignant cells.
Acute Methylene Blue treatment dramatically increases oxygen consumption rate (OCR) and decreases extracellular acidification rate (ECAR) in U87 Glioblastoma cells. Reversal of the Warburg effect was associated with a reduction of U87 cell proliferation, evidenced by the cell growth curve, liquid colony formation, and soft agar colony formation assays
CANCER NEEDS:
Glioblastoma cells, like other cancers, face two major metabolic challenges, bioenergetic and biosynthetic demands of rapid cell proliferation It has been proposed that the fundamental metabolic switch may confer to cancer cells a selective advantage during growth and proliferation.
Glucose not only provides the major fuel for ATP synthesis through glycolysis and mitochondrial oxidative phosphorylation but glucose also provides the backbone for intermediates needed in biosynthetic pathways, including ribose sugars for nucleotides, glycerol and citrate for lipids, nonessential amino acids, and NADPH through the oxidative pentose phosphate pathway.
Besides serving as the major bioenergetic hub, mitochondria also provide metabolites for macromolecule synthesis to meet the biosynthetic demand of a proliferating cancer cell.
We predict that Methylene Blue reverses the Warburg effect and switches mitochondria from a biosynthetic hub back to a predominantly bioenergetic hub in GBM cells, thus decreasing metabolic intermediates and inhibiting cancer proliferation. This notion is supported by our data that MB increases ATP production, decreases NADPH, and arrests cancer cells in S phase (!!!).
MB enhances oxygen consumption rate and extracellular acidification rate in glioma cells immediately after treatment
TEMOZOLOMIDE
TMZ is currently one of the primary chemotherapies for GBM. TMZ is a prodrug that decomposes into a drug which disrupts GBM cell division by heavily alkylating and methylating DNA.
Resistance to TMZ develops when cells increase expression of certain enzymes. We tested the effect of MB on both TMZ-sensitive and TMZ-resistant GBM cell lines, U87 and T98G, respectively. As predicted, TMZ arrests U87 cell cycle at M phase.
Methylene Blue induced cell cycle arrest in S phase and inhibited cell proliferation of both U87 and T98G cells. Similarly, Methylene Blue increased OCR, decreased ECAR, and activated the AMPK signaling pathway in T98G cells. These data suggested that Methylene Blue might be effective in both TMZ-sensitive and -resistant GBMs.
Our study indicated that MB and TMZ arrest GBM cells at different stages of the cell cycle; thus, an additive effect on GBM proliferation might be achievable with a combination therapy of MB and TMZ. A slight additive action was indeed observed in the combination therapy of MB and TMZ in the liquid colony formation assay; therefore, we predict that combination therapy of MB and TMZ might be able to decrease the necessary dose of each drug, reducing the side effects while still achieving the maximal inhibitory effect on GBM progression.
CONCLUSION:
Our current study demonstrated that Methylene Blue exerts profound action on GBM bioenergetics. Methylene Blue inhibits GBM cells proliferation and arrests the cell cycle in S phase The effect of MB on GBM proliferation intertwined with the activation of AMPK and its downstream signaling of ACC and cyclin expression By reversing the Warburg effect, Methylene Blue switches the mitochondria from a biosynthetic hub to bioenergetic hub and inhibits GBM cell proliferation. Although the inhibitory action of Methylene Blue on cancer proliferation needs further verification in vivo using different treatment paradigms, our in vitro data provide the proof of concept that reversal of Warburg effect might be a novel therapy for Glioblastoma (!)
This is a very interesting study from a mechanistic view point of how Methylene Blue works on Cancer!
Read More: Methylene Blue for Cancer
Methylene Blue and Ovarian Cancer
According to Dr William Makis (X/Twitter):
"2024 Moreira - Methylene Blue Metabolic Therapy Restrains In Vivo Ovarian Tumor Growth" (source)
"Ovarian cancer remains a significant challenge, especially in platinum-resistant cases where treatment options are limited."
"In this study, we investigated the potential of methylene blue (MB) as a metabolic therapy and complementary treatment approach for ovarian cancer"
Methylene blue (MB), a well-known dye agent, has shown promising effects in stimulating mitochondrial electron transfer chain and oxidative phosphorylation (OXPHOS), leading to increased mitochondrial respiration and ATP production MB has also been reported to have direct effects on cell and mitochondrial metabolism.
Methylene blue metabolic therapy exerted a strong inhibitory effect on the proliferation of the TOV112D ovarian cancer cell line, where the cell proliferation reached 16% of the control.
Addition of carboplatin to MB-50 exhibited a slight impact on TOV112D proliferation compared to MB-50 alone, but this effect was not significant (adding chemo to methylene blue makes little difference)
DISCUSSION:
The anticancer effect of methylene blue has been known for over a century. In 1893, Louis Rambaud published data on a series of end-stage patients who responded to a high-dose treatment of methylene blue. This was confirmed by Pursell in cancer treatments on dogs.
The results presented in this study demonstrate the potential of methylene blue (MB) metabolic therapy as an effective treatment approach for ovarian cancer “stronger reduction in proliferation observed in TOV112D (platinum resistant cancer) cells compared to ARPE-19 (normal ovarian) cells in response to the MB-50 treatment highlights the potential of methylene blue as a therapeutic agent that specifically targets ovarian cancer cells”
"Addition of carboplatin to MB-50 exhibited a slight impact on the TOV112D proliferation compared to MB-50 alone, suggesting a potential additive effect of carboplatin in combination with methylene blue, albeit to a limited extent."
Modest enhancement of the in vivo tumor response observed to the combination of MB and carboplatin (MB + carboplatin) raises the possibility of a synergistic effect between methylene blue and carboplatin.
“it would be highly relevant to identify the metabolic pathways as well as the signaling pathways involved in the inhibition of cancer cell growth by methylene blue”
“In conclusion, this study provides crucial insights into the potential of methylene blue-guided metabolic therapy for treating ovarian cancer. The results underscore the promise of metabolic therapy in reducing tumor growth by addressing the mitochondria redox potential, akin to its role as an oxidative agent in bacterial diseases. However, there is a pressing need for further investigations into the specific impact of methylene blue on apoptotic signaling and metabolic pathways within cancer cells. These molecular mechanisms must be thoroughly elucidated to optimize the application of metabolic therapy and enhance the treatment outcomes, particularly in the context of chemoresistant ovarian cancers.
My Take…
In this paper, methylene blue had a dramatic effect on ovarian cancer cell proliferation, oxygen consumption rate in tumor cells and on tumor growth. However, the pathways are unknown. Interestingly, while MB slowed the tumor growth rate significantly (much better than chemo), it didn’t stop the tumor growth. The authors admit they don’t really know exactly how methylene blue works against ovarian cancer."
Read More:METHYLENE BLUE in GLIOBLASTOMA (Brain Cancer)
Methylene Blue in Prostate Cancer (androgen-dependent and androgen-independent)
According to Dr William Makis (X/Twitter):
A few years ago there was an abstract presentation at the 2019 AACR Annual Meeting - American Association for Cancer Research
Shanti et al, looked at Methylene Blue in Prostate Cancer (source).
Highlights:
Methylene Blue effectively reduced the viability of androgen-dependent (LNCaP) and androgen-independent (PC3 and DU145) Prostate Cancer cells
Methylene Blue inhibited the colony forming ability of Prostate Cancer cells in-vitro suggesting its tumor suppressive potential
Methylene Blue treatment disrupted the migration potential of Prostate Cancer cells in a wound healing assay indicating the anti-metastatic function of MB
Methylene Blue effectively targeted the Prostate Cancer cell lines by inducing apoptotic cell death
Key apoptotic molecules such as Bax, TRAIL R2/D5, and phospho p53 (Serine 15, Serine 46, Serine 392) were robustly upregulated in androgen-dependent LNCaP cells following MB treatment.
“In conclusion, our findings suggest that MB induces apoptosis in Prostate Cancer cells and thus could serve as a potential anticancer agent for treating both hormone-dependent and -independent Prostate Cancer”
My Take…. Although this was an abstract presentation, it was nonetheless a very interesting one. We are still learning about the mechanisms of action of methylene blue on cancer cells but as we’ve seen with Ivermectin and Fenbendazole, it appears that numerous mechanisms are in play.
Read More: Methylene Blue for Cancer
8. Methylene Blue and Nitric Oxide: From Shock Rescue to Anti-Aging Modulation
Nitric Oxide (NO): Anti-Aging Hero or Aging Accelerant?
Anti-aging effects of NO (when produced in physiological amounts)
Maintains endothelial function and vascular elasticity
Improves blood flow and nutrient/oxygen delivery to tissues
Supports mitochondrial biogenesis via cGMP → PGC-1α signaling
Acts as a mild signaling molecule that activates antioxidant defenses (e.g., Nrf2 pathway)
Essential for exercise-induced benefits (shear stress → eNOS → NO)
Pro-aging / toxic effects of NO (when overproduced or dysregulated)
Reacts with superoxide (O₂⁻) → peroxynitrite (ONOO⁻), one of the most damaging ROS/RNS
Peroxynitrite causes protein nitration, lipid peroxidation, DNA strand breaks, PARP activation → cellular energy collapse
Chronic low-grade inflammation (inflammaging) upregulates iNOS → sustained excess NO and ONOO⁻
Strongly implicated in neurodegenerative diseases (Alzheimer’s, Parkinson’s), atherosclerosis, diabetes, and sarcopenia
High NO → inhibits mitochondrial complex IV and aconitase → reduced ATP and increased ROS
Net effect on aging
Physiological pulsatile NO from eNOS = anti-aging
Chronic excessive NO from iNOS or mitochondrial NOS = accelerates aging and age-related diseases
How Methylene Blue Interacts with the NO/Aging Axis
High-dose IV MB (1–2 mg/kg)
Strongly inhibits soluble guanylate cyclase → blocks pathological NO–cGMP vasodilation
Used when massive iNOS-derived NO is life-threatening (septic shock, vasoplegia)
Low-dose MB (0.5–4 mg/day or less, often called “mitochondrial” or “pro-cognitive” dosing)
Mildly suppresses excess/pathological NO signaling without abolishing physiological NO
Directly scavenges peroxynitrite and reduces nitrotyrosine formation
Acts as an alternative electron acceptor/donor in the mitochondrial electron transport chain → bypasses NO-inhibited complex IV → restores ATP production
Reduces mitochondrial ROS production even when NO is present
Enhances cerebral blood flow paradoxically (via improved mitochondrial efficiency, not via NO–cGMP)
Why low-dose MB is considered anti-aging by some researchers and clinicians
Selectively dampens the pro-aging (peroxynitrite/iNOS) arm of NO signaling
Preserves or even enhances the beneficial (eNOS/shear-stress) arm
Improves mitochondrial function independent of NO
Shows neuroprotective effects in models of Alzheimer’s, Parkinson’s, stroke, and traumatic brain injury
Anecdotally improves energy, mood, and cognition in Long COVID, chronic fatigue, and age-related decline
Bottom-Line Summary
Nitric Oxide is both anti-aging (physiological amounts, eNOS-derived) and aging-accelerating (chronic excess, iNOS/mitochondrial-derived → peroxynitrite)
Methylene Blue’s effect on the NO system is dose-dependent and context-dependent:
– High doses: blunt antagonist of pathological NO (life-saving in shock)
– Very low doses: selective modulator that reduces the harmful NO/peroxynitrite pathway while supporting mitochondrial health → potential anti-aging tool
So the same molecule (NO) can be friend or foe in aging, and MB is one of the few compounds that can tilt the balance toward the “friend” side at micro-doses.
9. Urinary Tract Infections in the Elderly
In my mind, this is one of the most important uses: It is a highly effective agent against urinary tract infections (UTIs). Many elderly are put on antibiotics, which disrupts their microbiome. Methylene blue was used for many decades at a dose of 65 mg per day and was even sold in pharmacies as Urolene Blue.
Methylene blue does make an effective antimicrobial, and it is probably safer than most antibiotics in the sense that most of them are mitochondrial toxins and methylene blue is an antidote to some mitochondrial toxins.
Since your body doesn’t really metabolize it, it is excreted by your kidneys into your bladder where it reaches very high concentrations over time and becomes a potent oxidant stress that kills virtually any pathogen in the bladder. Plus, it has the additional “side effect” of improving brain health and reducing dementia. In my mind, it is reprehensible medical malpractice not to use methylene blue in UTIs in the elderly. It clearly is the safest and most effective drug of choice.
10. Methylene Blue Side Effects and Contraindications
While methylene blue has an impressive safety profile when used appropriately, there are some important considerations:
G6PD deficiency — Methylene blue is contraindicated in patients with this genetic disorder. Absolute contraindication—triggers hemolytic anemia by depleting NADPH, rupturing red blood cells. Always check G6PD first to avoid hemolysis.
Blue discoloration — Methylene blue will temporarily turn urine and sometimes your tongue blue. This is harmless but can be startling if unexpected. This typically occurs when the dose is larger than 30 to 50 mg which is a dose about ten times higher than I recommend for most.
Interference with pulse oximeters — High doses of methylene blue can affect pulse oximeter readings.
Serotonin syndrome risk — We would advise strong caution for anyone ever to take an SSRI drug. Taking methylene blue only worsens this risk as they increase serotonin levels even further. This typically only occurs at high doses that are used to treat life threatening situations and is likely rarely, if ever, occur at lower doses that I recommend of 3 to 5 mg. This mostly occurs in those on SSRI drugs and taking doses of methylene blue over 100 mg. (Mercola, Synapse by Patsnap)
Kidney concerns — Those with severe renal insufficiency should use caution and work closely with a health care provider.
Cardiovascular effects, though less common, may include increased blood pressure (methylene blue >7 mg/kg) and palpitations.
Methylene blue can interact with various medications, particularly antidepressants and antimalarials, altering their efficacy or causing adverse reactions.
The most common side effects related to methylene blue involve gastrointestinal discomfort, including nausea and diarrhea, which are typically mild and transient. However, allergic reactions, ranging from skin rashes to life-threatening anaphylaxis, are also possible.
Methylene Blue Adverse Events - Clinical Trials
In the first phase III trial, there was a dose-dependent effect on people dropping out of the trial: 24% of the 8 mg “placebo,” 31.3% of the 150 mg group, and 38.3% of the 250 mg group. Gastrointestinal and urinary problems were the most common side effects driving this.
In the second phase III trial, five times as many people dropped out in the 200 mg treatment group as in the 8 mg “placebo.” Again the most common increased side effects were gastrointestinal and urinary.
The earlier phase II trial had four times as many treatment subjects drop out (31.4%) as 8 mg “placebo” subjects (7.6%) over 24 weeks. Consistent with the phase III trials, gastrointestinal side effects, mainly diarrhea, and urinary side effects, mainly an alteration of urinary output, were the prime drivers.
However, the phase III trials found no difference in injuries from falls, while the phase II trial found a large increase. Only 1.1% of the 8 mg “placebo” group participants reported an injury from falling, while this rate was 8.5% in the 60 mg group, 5% in the 120 mg group, and 5.6% in the 200 mg group. Altogether, the injuries from falling were reported in 6.1% of the treatment group participants, 5.6-fold greater than in the 8 mg “placebo” group.
The problem with these trials is they tried treating a common disease — Alzheimer’s — rather than looking specifically for people with respiratory chain disorders that could be treated with methylene blue.
Contraindications
While methylene blue is safe in general, there are some contraindications. One is G6PD deficiency*, which is also a contraindication for high-dose ascorbic acid treatments, which could be deadly.
*Note: Always check G6PD first to avoid hemolysis. G6PD deficiency is when the body is missing or doesn't have enough of an enzyme called G6PD (glucose-6-phosphate dehydrogenase).
Methylene blue is also a mild monoamine oxidase (MAO) inhibitor, so taking high doses with a selective serotonin reuptake inhibitor (SSRI) antidepressant could potentially lead to serotonin syndrome, which is not good. The risk of this, however, is very small.
Other contraindications include hydroxylamine toxicity and renal failure.
11. Dosing Suggestions
As mentioned, methylene blue is a hormetic, so low dosages have the opposite effect of high dosages. While every possible dose response has not been tested, as a general guideline, the benefits Gonzalez-Lima (Ph.D., an expert on methylene blue) discusses are based on dosages between 0.5 milligram per kilogram of bodyweight to 4 mg per kg. He admits lower doses may work but he hasn’t tested them.
For an acute treatment, the upper limit is between 3 mg to 4 mg per kg, which is typically the range given as an IV antidote for methemoglobinemia. For nonacute, more long-term treatment, 0.5 mg to 1 mg per kg per day works better. It has a half-life of 12 to 13 hours, so once-a-day dosing is fine. He gives the following example of how methylene blue has been used in the treatment of fears and phobias:
“One of the processes in which a memory formation can be used therapeutically is when you form a memory to extinguish fear. Individuals who have a phobia, you can expose them to the specific situation that is involved in the phobia, and there is a learning called extinction learning that happens that you extinguish your response.
In that situation, we only give methylene blue once after this extinction learning to facilitate the process of memory consolidation. What happens after you go through the learning is the process of consolidation, which requires energy.
So, by facilitating the energy availability during the consolidation phase, which happens over a number of hours, then the next time [you’re exposed to fear-evoking stimuli, you’ve] consolidated that extinction memory more effectively.
We’ve done this also with post-traumatic stress disorder (PTSD), where you use prolonged exposure therapy. In that situation, you can give the methylene blue after different sessions where you see that there is a good extinction learning.
In other words, where people are learning through exposure to reduce their fear levels, that’s when you want to reinforce that therapeutic learning by giving them the methylene blue right after the session.”
For brain health, nootropic effects and the prevention or treatment of dementia, 0.5 mg to 1 mg per kg per day (or when needed) is the dose Gonzalez-Lima recommends and uses.
Methylene blue low dose works particularly well for those who have reductive stress.
12. How to Select a High-Quality Product
Last but not least, selecting the correct product is of crucial importance, in addition to getting the dosing right. There are three basic types of methylene blue: industrial, chemical and pharmaceutical-grade.
The only version you’ll want to use medicinally is pharmaceutical-grade. Do not ingest methylene blue from the pet store that is meant for fish tanks. Industrial-grade methylene blue has lots of impurities, and typically contain only 10% to 25% methylene blue.
Chemical or laboratory grade, which is used for staining purposes on laboratories, has a much higher purity, but it’s still not suitable for medicinal purposes as it typically has heavy metal contaminants like lead, cadmium and arsenic. Over time, the impurities can accumulate in your body, resulting in toxicity.
Pharmaceutical grade is 99%+ pure. This is the kind used when injected intravenously for antidote purposes, or used orally. These products will be marked USP, which stands for United States Pharmacopeia.
According to Gonzalez-Lima, USP is better in terms of purity than the European pharmaceutical grade, which has fewer requirements. Taking the methylene blue with some ascorbic acid (vitamin C) facilitates absorption. You won’t find methylene blue at your local pharmacy but many compounding pharmacies can obtain the pharmaceutical grade.
“Ascorbic acid is a way to facilitate the cycling of methylene blue by promoting its reduction,” he explains. Considering the importance of mitochondrial health, methylene blue appears to be a simple and remarkably effective way to improve your overall health and cognitive function.
13. How to Use Methylene Blue
Most experts recommend relatively high doses for longer-term treatments, including dementia prevention and treatment, post-stroke care, cognitive enhancement and overall health optimization.
The doses they advise are 0.5 milligram (mg) to 1 mg per kilogram of body weight. I believe these doses are highly excessive and unnecessary. Please understand that doses of more than 3 to 5 mg are likely never needed unless you are undergoing treatment for some life-threatening conditioning like carbon monoxide or cyanide poisoning or a resistant urinary tract infection.
Selecting the right product is also important, and there are three types typically sold — industrial-grade, chemical-grade (laboratory-grade) and pharmaceutical-grade. The only one you should use is the pharmaceutical-grade variety. Other types of methylene blue, such as the one found in pet stores, are meant for keeping aquariums clean. Industrial-grade methylene blue contains impurities, and should never be used for any biological purposes.
There are several important considerations to consider when using methylene blue. Firstly, while you can easily and cheaply purchase methylene blue online, this is rarely a pharmaceutical grade product, and we strongly recommend never using these products because of the risk of heavy metal contamination.
Secondly, it is a prescription drug and can only be used with a prescription from a doctor. If you’re considering it, we encourage you to speak with your doctor about whether it might be appropriate for your needs.
Thirdly, it’s best to get your prescription filled by a compounding pharmacy. The only form of methylene blue available at conventional pharmacies is for IV use and a 10 ml vial contains 100 mg and costs over $200.
Remember, true longevity blooms from informed action—consult your doctor, test for G6PD, and embrace this blue beacon with caution and curiosity.
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Wang Y, Ren K, Liao X, et al. Inactivation of Zika virus in plasma and derivatives by four different methods. J Med Virol. 2019,91 (12):2059-2065. https://pubmcd.ncbi.nlm.nih.gov/31389019
Papin JE, Floyd RA, Dittmer DP. Methylene blue photoinactivation abolishes West Nile virus infectivity in vivo. Antiviral Res. 2005;68(2):84-87. https://pubmed.ncbi.nlm.nih.gov/16118025
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Wong T-W, Huang H-J, Wang Y-F, Lcc Y-P, Huang C-C, Yu C-K. Methylene blue-mediated photodynamic inactivation as a novel disinfectant of enterovirus 71.J Antimicrob Chemother. 2010,65(10):2176-2182. https://pubmcd.ncbi.nlm.nih.gov/20719762
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21 Müller-Breitkreutz K, Mohr H. Hepatitis C and human immunodeficiency virus RNA degradation by methylene blue/light treatment of human plasma. J Med Virol. 1998;56(3):239-245. https://pubmed.ncbi.nim.nih.gov/9783692
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Methylene blue photochemical treatment as a reliable SARS-CoV-2 plasma virus inactivation method for blood safety and convalescent plasma therapy for the COVID-19 outbreak. https://www.rescarchsquare.com/article/rs-17718/v1
Gendrot M, Andreani J, Duflot I, et al. Methylene blue inhibits replication of SARS-CoV-2 in vitro. Int ] Antimicrob Agents. 2020;56(6):106202. https://pubmed.ncbi.nlm.nih.gov/33075512
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Methylene Blue + NAD + PQQ: RECHARGE
Available on The Wellness Company
The ultimate brain hack. RECHARGE is the first-ever combination of Methylene Blue, NAD+, and PQQ for enhanced cognitive function and ultimate mitochondrial health.
From sharper thinking to stronger cells, Methylene Blue enhances how your brain and body perform by enhancing mental clarity and focus, supporting blood flow, and increasing ATP production.
While methylene blue is safe, there are some contraindications. One is G6PD deficiency*, which is also a contraindication for high-dose ascorbic acid treatments, which could be deadly.
*Note: Always check G6PD first to avoid hemolysis. G6PD deficiency is when the body is missing or doesn't have enough of an enzyme called G6PD (glucose-6-phosphate dehydrogenase).
Where to Buy Methylene Blue + NAD + PQQ (RECHARGE): Here is the link: Methylene Blue + NAD + PQQ
Thanks for this very well-written dive into Methylene Blue. I have been taking MB for 3 yrs after I read the work of Dr. Francisco Gonzalez-Lima from the University of Texas ( find his studies on PubMed)
I found excellent products from Best365labs.com. I take 15 mg daily. I’ve had no side effects. I’ve researched the concerns about MB use with SSRI’s and I think the worries are grossly exaggerated. The handful of instances where people on SSRIs had a reaction to MB were cases where people received large quantities to a surgical wound meaning hundreds of mg. I have been using the Bluelene products formulated by Dr.Cao. I utilize red light therapy to the skin and head to potentate its good effects. MB is a safe, effective way to promote brain health, assist anti-aging and prevent cancer.
PS. It is easily obtained without a prescription.