Snake Oil or Science?

Does methylene blue work as a brain or anti-aging supplement?

Proceed with cautionCEvidence grade: Real drug, unproven wellness use

Methylene blue is a real, approved pharmaceutical (used for methemoglobinemia) with genuine pharmacology, but its trendy use as a daily nootropic or anti-aging supplement is unproven in humans and carries real drug interactions. Verdict: proceed with caution, this is a drug being sold as a wellness product.

Created by Maurice Lichtenberg, Founder, Longevity Cities · Reviewed 2026-07-02

What the evidence says

Methylene blue is an established medicine with clear approved uses and decades of pharmacology; at low doses it interacts with mitochondrial electron transport, a real mechanism.
Human cognitive-enhancement data are early: a few small studies and a lot of extrapolation from animal and cell work.

Where the claims outrun the evidence

No robust human trials establish that daily low-dose methylene blue slows aging or reliably improves cognition in healthy people.
It is a monoamine oxidase inhibitor: combined with SSRIs, SNRIs and other serotonergic drugs it can trigger serotonin syndrome, a potentially serious reaction.
Purity and dosing of consumer 'USP' or aquarium-grade products vary, and it stains everything blue including urine.

Safety and caveats

This is the most safety-sensitive item here: do not combine methylene blue with antidepressants or other serotonergic drugs, and treat any self-dosing as a medical decision, not a supplement choice.

The bottom line

Methylene blue is not snake oil, it is a real drug, but that is exactly why the casual 'daily nootropic' framing is risky. The wellness claims are unproven and the interaction risks are real.

Check it yourself

Frequently asked questions

Is methylene blue a scam?

No, it is a genuine approved medicine. But selling it as a safe everyday brain or anti-aging supplement is misleading: the wellness benefits are unproven in healthy people and it has real drug interactions that a supplement framing hides.

Is methylene blue safe to take daily?

Not casually. It is a monoamine oxidase inhibitor and can cause serotonin syndrome with common antidepressants. Dose, purity and interactions make it a medical decision, not a routine supplement. Talk to a doctor before using it.

Checking a different claim?

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This is an educational assessment of how a claim is presented and what evidence backs it, not medical advice. It does not diagnose, treat, or tell you to start or stop anything. Verify with your own doctor and the primary sources.