Is methylene blue a peptide?

No. It is a synthetic phenothiazine dye, not a peptide, but it is commonly sold by peptide vendors and studied for mitochondrial and cognitive support.

Why does dose matter so much with methylene blue?

Methylene blue is hormetic: at low doses it acts as an antioxidant and energy enhancer, while at high doses it becomes a pro-oxidant. The nootropic research range is far below acute medical dosing.

What is the most important safety interaction?

Methylene blue inhibits monoamine oxidase, so combining it with serotonergic medications such as SSRIs can trigger serotonin syndrome and should be avoided.

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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.

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