Methylene Blue
Methylthioninium Chloride · MB · Tetramethylthionine
Methylene blue (methylthioninium chloride) is a synthetic phenothiazine dye first produced in 1876, making it one of the oldest synthetic drugs in medicine. It is FDA-approved for the treatment of acquired methemoglobinemia (where it acts as an electron carrier to reduce methemoglobin back to functional hemoglobin) and is on the WHO List of Essential Medicines. It has a long history of use in diagnostic procedures, as a surgical dye, and as an antiseptic.
Oral or IV. Morning preferred (energizing). Low doses (0.5-2mg/kg). Can stain urine blue.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
How it works
Acts as an alternative electron carrier in the mitochondrial electron transport chain, cycling between oxidized (blue) and reduced (colorless leuco-methylene blue) forms. It can accept electrons from NADH and donate them directly to cytochrome c, bypassing Complex I-III blockades. This sustains ATP production and reduces electron leak/ROS generation from dysfunctional mitochondria.
In methemoglobinemia, methylene blue is reduced by NADPH-methemoglobin reductase to leucomethylene blue, which then donates electrons to reduce methemoglobin (Fe3+) back to functional hemoglobin (Fe2+), restoring oxygen-carrying capacity.
Exhibits dose-dependent hormetic behavior: at low concentrations (0.5-2mg/kg), it acts as an antioxidant by improving electron flow and reducing ROS. At high concentrations, it overwhelms reduction capacity and generates superoxide, becoming pro-oxidant. This hormetic window is critical for therapeutic use.
What to expect
Days 1-7: Blue urine (normal and expected). Possible subtle cognitive effects. Mild GI adjustment period.
Evidence
Claims we could not support
No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.
Dose/route: 0.5-1mg/kg; Oral; 1x daily. No checked live PubMed abstract verified this exact displayed dose, route, and frequency for the same molecule/formulation and relevant population.
Mechanism: Acts as an alternative electron carrier in the mitochondrial electron transport chain, cycling between oxidized (blue) and reduced (colorless leuco-methylene blue) forms. It can accept electrons from NADH and donate them directly to cytochrome c, bypassing Complex I-III blockades. This sustains ATP production and reduces electron leak/ROS generation from dysfunctional mitochondria.. No checked live PubMed abstract provided an exact-molecule/formulation sentence supporting this source-JSON mechanism claim.
Primary safety claim: Blue-green discoloration of urine (universal, harmless, expected). No checked live PubMed abstract directly verified this source-JSON safety claim at the displayed formulation, route, and regimen.
Interactions & stacking
Two different questions: what is documented about running these together, and what is documented about drawing them into the same syringe. A good pharmacological partner can still have to be pinned separately.
Documented together
Keep separate
Check any specific pair in the Stack & Interaction Checker, which answers both questions separately. Absence of a documented conflict is not evidence of safety.
Pharmacokinetics
Terminal half-life ~24 hours due to tissue distribution
Oral, immediate IV
Due to extensive tissue binding and long terminal half-life
Oral. ~100% IV.
Mitochondrial electron carrier effects persist due to tissue retention
Hepatic (reduction to leucomethylene blue) and renal (excreted as parent compound and metabolites in urine)
Storage. Store at room temperature (15-25C). Protect from light. Aqueous solutions are stable but light-sensitive. Pharmaceutical grade (USP) required for medical use.
Regulatory status
FDA-approved (ProvayBlue, generic) for treatment of acquired methemoglobinemia. Investigational for Alzheimer's disease (LMTM failed Phase III primary endpoints). Off-label use for cognitive enhancement, vasoplegic syndrome, and ifosfamide encephalopathy. WHO Essential Medicine.
Put it to work
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The guide & community
The complete Methylene Blue walkthrough, real protocol discussion and coaching live inside the BlessUp community on Skool.
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