OnePin Peptide Library · Cognitive & Mood
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.,At the mitochondrial level, methylene blue functions as an alternative electron carrier in the electron transport chain, accepting electrons from NADH and transferring them to cytochrome c. This bypass mechanism can sustain ATP production even when Complex I or Complex III are impaired, which has generated significant interest in its potential for neurodegenerative diseases, cognitive enhancement, and aging. At low doses (0.5-2mg/kg), it acts as an electron donor (antioxidant), while at higher doses it paradoxically becomes a pro-oxidant.,Research interest in methylene blue has surged in recent years, particularly for cognitive enhancement, neuroprotection, and mitochondrial support. Preclinical studies show improvements in memory, mitochondrial function, and neuroprotection in various disease models. A modified form (LMTM/TRx0237) has been tested in Phase III Alzheimer's trials with mixed results. Low-dose oral methylene blue is used off-label in nootropic and longevity communities, though human clinical data for cognitive enhancement in healthy individuals remains limited.
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.
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
Interactions & stacking
What's safe to combine, and what belongs in a separate pin.
Safe & synergistic
Keep separate
Pharmacokinetics
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.
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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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