Methylene Blue
aka MB
Mitochondrial electron carrier / phenothiazine dye
Half-life
~5–6 hours (oral)
How long it stays active in your body
Dosing
Earlier in day — energizing
How often you take a dose
Route
Oral · IV
How it goes into the body
Status
FDA
Approved by the FDA for prescription use
What it is
A century-old compound — originally a textile dye, FDA-approved as an antidote for methemoglobinemia. At low doses, acts as an alternative electron carrier in the mitochondrial electron transport chain, bypassing Complex I bottlenecks. Used off-label for cognitive enhancement, mitochondrial support, and longevity.
How it works
At nanomolar doses, accepts electrons from NADH and donates to cytochrome c, bypassing damaged Complex I. Increases ATP output ~30–70%. Effect is amplified by red light / sunlight (photoactivation). At higher doses (>100 mg) effect reverses and becomes pro-oxidant.
What the research says
Strong basic science. Multiple animal studies for cognition, neuroprotection. Limited human RCTs at the low doses used by biohackers. Bachmeyer, Castore, and Enhanced Man all run it. Always paired with 500 mg Vitamin C to keep MB in its reduced active form.
Sources: PubMed: Methylene Blue cognition
Common dosing ranges
- Range
- 5–15 mg/day oral (pharmaceutical-grade)
- Frequency
- Earlier in day — energizing
- Duration
- 2 months on / 1 month off (Enhanced Man); start low, titrate
Sources: PubMed
Administration
Side effects
Common
- Blue/green urine (harmless)
- Slight tongue staining
- Mild stimulation
Serious / theoretical
- HARD CONTRAINDICATION with SSRIs/SNRIs — serotonin syndrome risk
- Avoid in G6PD deficiency
- Pro-oxidant effect above 100 mg
- Avoid in pregnancy
Sources: PubMed: MB safety
Notes
Pharmaceutical-grade only — aquarium-grade has heavy metal contamination. MUST pair with 500 mg Vitamin C. Effect amplified by morning sunlight or red light therapy. Stack with Semax/Selank for cognitive protocols.