Methylene Blue
Also known as: Methylene Blue
Methylene Blue is a synthetic phenothiazine dye studied as a mitochondrial enhancer and nootropic, acting as an alternative electron carrier in the respiratory chain. Note: Methylene blue is a small-molecule redox dye, not a peptide, though suppliers often stock it alongside peptides.
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Mechanism of Action
Methylene Blue is a redox-active small molecule that, at low concentrations, accepts electrons from NADH and donates them directly to cytochrome c, bypassing complexes I-III of the electron transport chain. This alternative electron shuttle increases mitochondrial oxygen consumption and ATP production while reducing electron leak and reactive oxygen species. It also inhibits monoamine oxidase and nitric oxide synthase, and at clinical doses it reduces methemoglobin back to functional hemoglobin, which underlies its approved use in methemoglobinemia.
- Half-life
- Roughly 5 to 24 hours depending on dose and route
- Administration Routes
- oral, intravenous
- Research Status
- Clinical
Reported Benefits
- Supports mitochondrial respiration and ATP output
- Studied as a cognitive and memory enhancer
- Acts as an antioxidant at low doses
- Approved medically for methemoglobinemia
- Investigated for neuroprotection
- May improve cellular energy metabolism
Potential Side Effects
- Blue-green discoloration of urine and skin
- Serotonin syndrome risk when combined with serotonergic drugs
- Nausea or gastrointestinal upset
- Headache or dizziness
- Pro-oxidant and hemolytic effects at high doses
Common Dosing
For research use only: low-dose nootropic literature references roughly 0.5-4 mg per kg, far below acute medical dosing, taken orally. Not personal medical advice.
The dosing information above is aggregated from research literature and anecdotal community reports for educational purposes only. It is not a recommendation, prescription, or medical advice. Peptides are sold as research chemicals only and are not intended for human use.
Contraindications
- Concurrent use of SSRIs, MAOIs, or other serotonergic agents
- G6PD deficiency due to hemolysis risk
- Pregnancy and breastfeeding
- Known hypersensitivity to methylene blue
NAD+
NAD+ is an essential coenzyme central to cellular energy production and DNA repair whose levels decline with age. It is studied and supplemented for longevity, mitochondrial function, and metabolic health. Note: NAD+ is a coenzyme, not a peptide, commonly sold alongside longevity research compounds.
NMN
NMN is a direct biosynthetic precursor of NAD+ used to raise cellular NAD+ levels. It is studied for longevity, metabolic health, and mitochondrial function. Note: NMN is a small-molecule NAD+ precursor, not a peptide, but is catalogued with longevity research compounds.
SS-31 (Elamipretide)
SS-31 (elamipretide) is a mitochondria-targeted tetrapeptide studied for protecting mitochondrial function in conditions involving oxidative stress and energy failure. It has been investigated clinically for mitochondrial myopathy and heart and kidney disease.
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Multimodal Randomized Functional MR Imaging of the Effects of Methylene Blue in the Human Brain
2016
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Alternative mitochondrial electron transfer as a novel strategy for neuroprotection
2011
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Methylene blue delays cellular senescence and enhances key mitochondrial biochemical pathways
2008
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Neurometabolic mechanisms for memory enhancement and neuroprotection of methylene blue
2012