Supplement / Liquid Oral / Redox

Methylene Blue

Methylthioninium chloride. Redox-active thiazine dye used medically for methemoglobinemia and sold in some wellness/nootropic drop products. Track as liquid oral drops taken in water. Verify the product label strength before logging.

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Educational reference only. This page does not diagnose, prescribe, or replace care from a licensed professional. Laws, availability, and clinical appropriateness vary by location.

Reference doseLiquid oral drops - follow product label or clinician guidance. Track drops or ml; not a dose recommendation.

Half-life5 hours

Risk flagmoderate

Regulatory noteFDA-approved context noted

Side effects and watch-outs

Blue/green urine, stool, or skin discoloration
Nausea or GI upset
Headache or dizziness
Restlessness or insomnia in sensitive users
Blood pressure or heart rate changes
Serotonin syndrome risk with serotonergic medications
Hemolysis risk in G6PD deficiency
Pulse oximeter readings can be unreliable