Methylene Blue_Dosage, benefits & legal status
Also known as methylthioninium chloride
A low-dose blue compound taken for focus and energy.
Common vial size is what vendors typically sell, not a recommendation. Enter your own vial in the calculator.
What is Methylene Blue?
Plain language first. The technical label stays, but it never stands alone.Overview
At low doses it helps mitochondria make energy more efficiently, which is why it is taken for focus and energy. It famously turns urine blue-green, which is harmless.
Methylene blue is a century-old synthetic dye, not a peptide, that can shuttle electrons inside cells' energy machinery.
What it's used for
People take it for sharper focus and steadier energy. It works quickly.
How does Methylene Blue work?
What it does in the body, and where.Methylene blue is a synthetic dye from 1876, and one of the oldest synthetic drugs still in use. It is not a peptide.
- 01It can carry electrons inside mitochondriaBypassing damaged steps in the chain that cells use to make energy.
- 02The dose direction matters enormouslyAt low doses it assists energy production. At high doses it does the opposite and becomes an oxidant. This reversal is well documented and it is why more is not better.
- 03It is an MAO inhibitorWhich means a genuine risk of serotonin syndrome when combined with SSRIs, SNRIs, or other serotonergic drugs. This is the most important practical fact about it.
- 04It stains everything blueIncluding urine, and skin if spilled.
A schematic of the compound's mechanism, not a diagnostic image.
What else is it used for?
Each use below carries its own evidence level. Approved means regulators have cleared it for that purpose. Investigational means it is in trials. Early research means it is being studied and is not established.
- Methemoglobinemia, a blood disorder, which is its actual approved useFDA-approved
- A surgical dye to mark tissue during operationsFDA-approved
- Dangerously low blood pressure in septic shock, used in hospitalsClinical use
- Focus, energy, and brain function at low doses, which is why most people take itEarly research
The published record
Papers and trials about Methylene Blue
Searched: Methylene Blue, methylthioninium chloride.
358 papers tagged human · 203 not reviews or lab · 43 clinical trial publications
343 registered trials · 8 with posted results
Furthest stage reached: Approved in the US, into a vein only
Counted from Europe PMC indexing, not read by a person; a human tag can land on reviews, commentary or lab papers; clinical trial publications is the narrower count. 499 papers and 100 trials indexed in detail.
At a glance
Four things to know about Methylene Blue
Evidence
Supplement
Category
Brain, mood and sleep
Common vial
10 mg
Half-life
About 24 hours
How much, and do you cycle it?
The range, and whether you take breaks.5 up to 15 mg per day, daily. No established schedule No range
No published study has established how long to take this or whether a break is needed. Schedules quoted online come from vendors and forums, and different sources disagree.
About 24 hoursFDA label
The labeled figure is for intravenous use. About 40 percent leaves unchanged in urine. There is no separately labeled half-life for the oral route.
Source: ProvayBlue label section 12.3, DailyMed setid 4f6848e5-35ed-4046-b13c-3032b5ba3232
You can compare this against the whole library to see where it sits.
What does it cost?
Typical dose and cost, in plain numbers.The products priced here are not injected
The listed products are taken by mouth (oral).
Methylene Blue starts at $16.00 across 31 vendors, typically $0.07 – $1.70 per mg.
37 listings, last read Oct 24, 2026. Shipping and card fees are not included.
How do you store it?
Before mixing, and after.Room temperature. Cool, dry, out of light.
Methylene Blue is taken as a pill or capsule. Keep it in its original container at room temperature, away from heat, humidity, and direct sun. No fridge or mixing needed. Check the expiration date on the bottle.
What are the side effects and cautions?
Known cautions and warnings for this compound.Who should avoid it
- Taking an SSRI or SNRI antidepressant, or any other serotonin-affecting medicine, because the combination can cause a dangerous reaction called serotonin syndrome. The FDA has warned about this specifically
- G6PD deficiency, an inherited condition where it can destroy red blood cells
- Pregnancy
- Severe kidney impairment
Stop and get help
- Agitation, confusion, fever, muscle twitching, sweating, or a racing heart, which can signal serotonin syndrome and needs urgent care
- Shortness of breath, or bluish lips or fingertips
- Unusual tiredness with pale skin, which can signal red blood cell breakdown
- Signs of an allergic reaction such as face or throat swelling, hives, or trouble breathing
Common effects
- Blue-green urine, which is harmless and expected
- Mild nausea
- Headache
- Staining of the mouth and tongue with oral use
- At higher doses the risks rise sharply, which is why low-dose use is the norm
Where this page says nothing is established, that means nobody has studied it, not that a compound is safe.
Is Methylene Blue approved?
And where the numbers on this page come from.Yes, but only as a prescription injection. Methylene Blue is also sold without a prescription as a supplement, which is a different thing from that approved medicine.
- Into a veinFDA-approvedApproved as a prescription injectionPROVAYBLUE (methylene blue) injection, given into a vein, is FDA approved for the treatment of pediatric and adult patients with acquired methemoglobinemia (initial U.S. approval 2016). That approved use is unrelated to why people take it by mouth for focus and energy.
- By mouthSupplementSold as a supplementLow-dose methylene blue taken by mouth is sold without a prescription.
- RouteBy mouth (oral)
- Checked22 July 2026
- DoseFrom published human studies. Not approved by a regulator for this dose.
- Vial sizeFrom what vendors typically list; not a recommendation.
- Sources
What has happened recently
We have not yet written a full regulatory note for this compound. The status above is current as of the date shown.
You can compare this against the whole library, or read how to check a seller.
What else is like Methylene Blue?
Others in Brain, mood and sleep, side by side.If you're weighing Methylene Blue, it's worth reading P21, N-Acetyl Semax Amidate, and N-Acetyl Selank Amidate in the same class.
A low-dose blue compound taken for focus and energy.
- Dose
- 5 up to 15 mg per day
- How often
- Daily
An experimental peptide studied for new brain cells and memory.
- Dose
- Research only
- How often
- As studied
A longer-lasting version of Semax for focus and memory.
- Dose
- 0.2 up to 0.4 mg per day
- How often
- 1-2x daily
A longer-lasting version of Selank, with no study of its own.
- Dose
- Research only
- How often
- 1-2x daily
Guides for this compound
- mcg vs mg: The Peptide Dosing Mistake to Avoid
Your vial says mg and your protocol says mcg. Here is the conversion and how to check it.
Sources
- PROVAYBLUE (methylene blue) injection, prescribing information, DailyMed(2016)Indicated for the treatment of pediatric and adult patients with acquired methemoglobinemia. Initial U.S. Approval: 2016.
Beyond these, 599 records are indexed. Browse the records