Methylene Blue
Mitochondrial electron carrier, FDA Rx for methemoglobinemia, low-dose nootropic.
The links above are labelled third-party affiliate links. MolekulaX does not sell and does not verify product quality.
Pharmacology
Contents
WHAT IS METHYLENE BLUE?
Detailed overview
Methylene Blue (methylthioninium chloride) is a classical phenothiazine dye (known since 1876), an FDA-approved drug for methemoglobinemia (Provayblue®) and on the WHO Essential Medicines list. At low doses (10-50 mg oral, USP-grade purity) a nootropic effect is described: as a mitochondrial electron carrier (artificial shuttle) it bypasses damaged complex I/III units, sustains ATP synthesis and reduces oxidative stress (PMID 17928358). Cerebral blood flow improvement (PMC10638993), and mild MAO-A inhibition (PMID 31144270) → elevation of serotonin/dopamine/noradrenaline → mood improvement. ⚠️ At high doses (>4 mg/kg) it flips pro-oxidant and disrupts mitochondrial balance. ⚠️ Serotonin-syndrome risk with SSRI/SNRI (Lexapro, Zoloft etc.) due to MAO-A inhibition – AVOID THIS COMBINATION. Industrial dye grade (textile/laboratory dye) is NOT pharmaceutical quality → do NOT ingest.
Mechanism
Mitochondrial electron carrier + MAO-A
Half-life
~5-6.5 h
Legal status
FDA Rx (methemoglobinemia)
Receptor profile
- Mitochondrial electron transport (cytochrome c oxidase)Strong
- Brain oxidative metabolismModerate
- Antioxidant (low dose)Moderate
- MAO-A inhibitionWeak
Safety
Side effects, stop signs, contraindications
Side effects · 6
- Blue-green discoloration of urine and stool (harmless but common)
- Nausea, stomach upset, digestive discomfort with oral dosing
- Dysuria, urinary tract irritation, frequent urination
- Headache, dizziness at higher doses
- Mild tongue, teeth or skin staining, metallic taste
- At high doses (>4 mg/kg) pro-oxidant effect, paradoxical methemoglobinemia
Contraindications · 5
- Serotonergic drugs (SSRIs, SNRIs, MAO inhibitors, triptans) – serotonin syndrome risk from MAO-A inhibition, avoid combination
- G6PD deficiency – risk of severe hemolytic anemia, contraindicated
- Pregnancy and breastfeeding – avoid (risk of fetal harm)
- Severe renal impairment – reduced clearance, increased accumulation
- Only USP pharmaceutical-grade form; industrial dye grade is NOT for ingestion
Related Nootropics
Same therapeutic category
FAQ
FAQ
Methylene blue is a long-known dye that at high doses is an FDA-approved drug for a specific blood condition (methemoglobinemia). At lower, non-drug doses it's used with the idea of supporting how the cell's energy-producing mitochondria work, which is why it has also spread as a nootropic, but that use is not an official medical indication, just an experiential, supplement-style application.
Telegram
Have a question about Methylene Blue?
Reach out to us on Telegram for a personalized stack. We'll be happy to help.
Personalized consultation
Want a detailed conversation tailored to your data?
Fill out the prep intake form (your goals, training and health data), and the advisor prepares from it to give genuinely personalized guidance.
Fill out the form~5–7 min · prep questionnaire · confidential · GDPR-compliant
Structure & chemistry
The information here is strictly for educational and scientific purposes. It does not replace medical advice or clinical consultation, and it does not encourage illegal substance or pharmaceutical use. Data is sourced. When in doubt, consult your doctor.