MB-5 / MB-10 / MB-15 / MB-25 · Cognitive Capsule Protocol
Methylene Blue: The Hormetic Mitochondrial Guide
Methylene Blue is a 130-year-old dye, an FDA-approved methemoglobinemia treatment, an MAOI, and a mitochondrial electron carrier with real cognitive data. It is also the most dangerous compound on this site if you are on the wrong medications. This guide is direct about all four.
FDA Status
FDA-Approved for methemoglobinemia (IV)
Pharmacy
Optimal Balance Pharmacy (503A licensed)
Medical Service
RxPepsDirect, physician-supervised + SSRI screening
Access
33 U.S. States
Our promise: Methylene Blue is a monoamine oxidase inhibitor. Combining it with SSRIs, SNRIs, MAOIs, or other serotonergic agents can produce life-threatening serotonin syndrome. We lead with this, not bury it.
Medically reviewed by Dr. Jonathan Snipes, MD. Last reviewed May 18, 2026.Section 01
What Methylene Blue Actually Is
Methylene blue is a synthetic phenothiazine dye first synthesized in 1876. It is FDA-approved for the treatment of methemoglobinemia (intravenous, in hospital settings). Its off-label use as a cognitive enhancer and mitochondrial support compound has accumulated over the past two decades through animal models and small human studies.
Mechanistically, low-dose methylene blue is unusual: it shuttles electrons in the mitochondrial electron transport chain, acting as a bypass when Complex I is impaired. The same molecule, at higher doses, is a potent MAO-A inhibitor (the antidepressant class with the most serious drug interactions). This dual identity is why the protocol is narrow and the medication screening is non-negotiable.
1876
Year first synthesized. The oldest small molecule on this site.
MAO-A
Inhibition is the key drug-interaction risk. Strong enough to produce serotonin syndrome with SSRIs.
Hormetic
Biphasic dose response. Low dose = mitochondrial support. High dose = pro-oxidant.
Section 02
The SSRI Contraindication
| Medication Class | Examples | Risk |
|---|---|---|
| SSRIs | Fluoxetine, sertraline, escitalopram, citalopram, paroxetine | Hard Contraindication |
| SNRIs | Duloxetine, venlafaxine, desvenlafaxine | Hard Contraindication |
| MAOIs | Phenelzine, tranylcypromine, selegiline | Hard Contraindication |
| TCAs | Amitriptyline, nortriptyline, clomipramine | Hard Contraindication |
| Other serotonergic agents | Tramadol, dextromethorphan, meperidine, fentanyl, lithium, St John's wort, MDMA | Hard Contraindication |
| Triptans (migraine) | Sumatriptan, rizatriptan | Clinical Caution |
Medication Class
Examples
Risk
Medication Class
Examples
Risk
Medication Class
Examples
Risk
Medication Class
Examples
Risk
Medication Class
Examples
Risk
Medication Class
Examples
Risk
Section 03
Who It Is Actually For
| Profile | Goal | Fit |
|---|---|---|
| Cognitively-focused biohacker (35 to 65), no psychiatric meds | Mitochondrial cognitive support, neuroprotection signal | Strong Fit |
| Post-COVID cognitive complaints | Mitochondrial-support adjunct in broader recovery | Adjunct Use |
| Early cognitive decline (with neurology coordination) | Mitochondrial bypass support | Physician Decision |
| Anyone on SSRI / SNRI / MAOI / TCA / serotonergic agent | N/A. Serotonin syndrome risk. | Hard Contraindication |
| G6PD deficiency | N/A. Methylene blue can trigger hemolysis. | Contraindicated |
Profile
Goal
Fit
Profile
Goal
Fit
Profile
Goal
Fit
Profile
Goal
Fit
Profile
Goal
Fit
Section 04
How It Works
Methylene blue accepts electrons from NADH and donates them to cytochrome c, effectively bypassing Complex I and Complex III of the mitochondrial electron transport chain. In tissues with impaired Complex I function (aged mitochondria, post-viral mitochondrial dysfunction, some neurodegenerative processes), this bypass preserves ATP production that would otherwise fail.
Section 05
Realistic Expectations
Acute Signal
Some users report a mild focus and mental clarity signal in the hours after dosing. Many report nothing. Urine turns blue/green within hours and stays that way as long as you are dosing.
Cumulative Signal
If methylene blue is working for you, the accumulated effect is most apparent: less mental fatigue, slightly faster recall, improved cognitive stamina during long tasks. Effect is real but modest.
Protocol Reassessment
If you have not noticed any cumulative signal by week 8, the dose-response curve probably is not favoring you. RxPepsDirect physicians typically discuss dose adjustment or stopping at this point.
Section 06
Dosing Protocol (Hormetic)
RxPepsDirect offers methylene blue in four capsule strengths so the physician can match dose to body weight and tolerance. The clinical literature suggests cognitive benefit peaks around 1 mg per kg, which is why low-dose options exist.
| Capsule | Per Capsule | Typical Daily Use | Best For |
|---|---|---|---|
| MB-5 | 5 mg | 5 to 10 mg daily | Smaller body weight or first-time titration |
| MB-10 (common starting capsule) | 10 mg | 10 to 20 mg daily | Typical adult starting dose |
| MB-15 | 15 mg | 15 to 30 mg daily | Larger body weight or established tolerance |
| MB-25 | 25 mg | 25 to 50 mg daily | Highest standard dose. Stays under the hormetic threshold for most adults. |
Capsule
Per Capsule
Typical Daily Use
Best For
Capsule
Per Capsule
Typical Daily Use
Best For
Capsule
Per Capsule
Typical Daily Use
Best For
Capsule
Per Capsule
Typical Daily Use
Best For
Take with food, in the morning or early afternoon to avoid sleep interference. Pharmaceutical-grade methylene blue is essential because industrial-grade material contains heavy-metal contaminants.
Section 07
Ready to Take
1-2
Capsules per day, with food
503A
Compounding pharmacy (Optimal Balance)
USP grade
Pharmaceutical material, not aquarium dye
Section 08
Stacking
Pairs Well With
NAD+ injectable
Different mechanism (electron carrier vs redox cofactor). Common mitochondrial-support stack.
MOTS-c
Mitochondrial peptide via AMPK. No mechanistic conflict with methylene blue's electron-carrier action.
Coenzyme Q10
Native electron carrier. Complementary mitochondrial support.
Red light therapy
Photobiomodulation. Some preclinical data suggests synergy with low-dose methylene blue.
Hard Contraindications
All serotonergic medications
SSRIs, SNRIs, MAOIs, TCAs, tramadol, dextromethorphan, St John's wort, lithium. Serotonin syndrome risk.
G6PD deficiency
Methylene blue can trigger hemolysis in G6PD-deficient individuals.
Pregnancy / lactation
No safety data. Avoid.
Recreational MDMA, psychedelics with serotonergic action
Same serotonin syndrome risk as prescription serotonergics.
Section 09
Pricing
Who You Pay, and What For
Pharmacy: Medication
$1.75 per capsule. Compounded and shipped by Optimal Balance Pharmacy, a 503A licensed compounding pharmacy. Pharmaceutical-grade USP methylene blue.
Medical Service: Physician Consultation
$39 medical visit fee. Intake consultation including critical medication screening, protocol design, and follow-up. Billed by RxPepsDirect.
Section 10
Legal Access in 33 States
503A Licensed Pharmacy
Optimal Balance Pharmacy
FDA-Approved (IV indication)
Methemoglobinemia treatment, hospital use
Off-Label, Legal Practice
Oral capsules compounded for off-label cognitive use
Serious Drug Interactions
FDA 2011 safety communication on serotonin syndrome risk
Section 11
Community Q&A
I take an SSRI. Can I do a quick course of methylene blue?
No. There is no safe short course. The SSRI must be washed out (2 to 5 weeks for most, 5 weeks or longer for fluoxetine) before methylene blue is safe. If stopping the SSRI is on the table, that is a conversation with the prescribing psychiatrist, not a self-administered washout.
Why are there four capsule strengths?
Hormetic dosing. The cognitive benefit peaks around 1 mg per kg. A 60 kg adult and a 100 kg adult need meaningfully different doses to land in the same therapeutic window. RxPepsDirect physicians match strength to body weight.
Will my tongue turn blue?
Not if you keep the capsule intact and swallow with water. Urine will turn blue or green during use, which is expected and harmless.
Is the aquarium-grade stuff the same?
No. Industrial-grade methylene blue is not pharmaceutical grade and contains heavy-metal contaminants. Do not source human-use methylene blue from aquarium or laboratory suppliers.
What if Optimal Balance is out of stock?
Your RxPepsDirect physician will be notified and you will be contacted before any delay impacts your protocol. You only pay the pharmacy when your prescription actually ships.
Section 12
The RxPepsDirect Model
Pharmacy: Optimal Balance, 503A Licensed
Optimal Balance Pharmacy compounds methylene blue from pharmaceutical-grade USP material under patient-specific prescription, USP <795> non-sterile compounding standards, and federal 503A oversight.
Medical Service: RxPepsDirect Physicians
A licensed physician reviews every medication you take and have recently stopped, screens for G6PD and pregnancy, matches strength to body weight, and writes the prescription.
Transparent Safety Communication
The guide leads with the SSRI / serotonergic contraindication, flags the hormetic dose curve, and explains industrial-grade material risk. The medication-screening step is the safety mechanism that makes this protocol prescribable.
Legal Access in 33 States
Every shipment is a compounded prescription medication filled by a 503A licensed pharmacy under a physician prescription.
References
- Rojas JC, Bruchey AK, Gonzalez-Lima F. Neurometabolic mechanisms for memory enhancement and neuroprotection of methylene blue. Prog Neurobiol. 2012. PMID: 22155242
- Ramsay RR, Dunford C, Gillman PK. Methylene blue and serotonin toxicity: inhibition of monoamine oxidase A (MAO A) confirms a theoretical prediction. Br J Pharmacol. 2007. PMID: 17876303
- Telch MJ, Bruchey AK, Rosenfield D, et al. Effects of post-session administration of methylene blue on fear extinction and contextual memory in adults with claustrophobia. Am J Psychiatry. 2014. PMID: 24935406
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