Most methylene blue dosage information online falls into two useless categories: vague suggestions with no numbers, or medical protocols for IV administration that have nothing to do with oral supplements. Neither helps someone holding a bottle of methylene blue drops wondering how much to actually take.
This guide provides what you're looking for: a clear, practical dosage chart based on body weight, broken down by purpose, with the safety information you need to make informed decisions.
One thing to be clear about before the numbers. Almost all of the published safety thresholds for methylene blue come from intravenous use in hospital settings, treating methemoglobinemia and vasoplegic shock. There is no equivalent body of research establishing safe long-term oral supplement doses. The figures below are the best available reference points, not a clinical protocol, and this is information rather than medical advice. Methylene blue carries an FDA boxed warning for serotonin syndrome when combined with serotonergic medication. Talk to a doctor who knows your medication list before taking any of it.
Why Dosage Matters More With Methylene Blue
Methylene blue exhibits what researchers call a "hormetic dose-response." In plain terms: the same compound produces opposite effects at different doses. Low doses enhance mitochondrial function and support cognitive performance. High doses can impair the very functions you're trying to support.
A 2012 review by Rojas, Bruchey and Gonzalez-Lima in Progress in Neurobiology described this pattern, noting that at low doses methylene blue acts as an electron cycler in the mitochondrial electron transport chain with "unparalleled antioxidant and cell respiration-enhancing properties," while higher doses produce diminishing or opposite effects.
This makes getting the dose right more important than with typical supplements. More is not better. In fact, more can be worse.
The Methylene Blue Dosage Chart
By Body Weight and Purpose
| Body Weight | Low Dose (0.5 mg/kg) | Standard Dose (1 mg/kg) | Upper Range (2 mg/kg) | Maximum (4 mg/kg)* |
|---|---|---|---|---|
| 110 lbs (50 kg) | 25 mg | 50 mg | 100 mg | 200 mg |
| 130 lbs (59 kg) | 30 mg | 59 mg | 118 mg | 236 mg |
| 150 lbs (68 kg) | 34 mg | 68 mg | 136 mg | 272 mg |
| 170 lbs (77 kg) | 39 mg | 77 mg | 154 mg | 308 mg |
| 190 lbs (86 kg) | 43 mg | 86 mg | 172 mg | 344 mg |
| 210 lbs (95 kg) | 48 mg | 95 mg | 190 mg | 380 mg |
*The 4 mg/kg column is shown because it is the level used in one published human cognition study (Rodriguez et al., 2016, a single 280 mg dose). It is not a recommended supplement dose and should only be approached under medical supervision. Most oral supplement use falls in the 0.5-2 mg/kg range.
By Purpose
These ranges reflect what is commonly reported in supplement use and, where noted, what research protocols used. Only the memory and focus row and the neuroprotection row trace to published human or animal studies; the others describe common practice, not evidence.
| Purpose | Typical Dose Range | Basis |
|---|---|---|
| General mitochondrial support | 5-15 mg/day | Common supplement practice. No controlled trial at this dose. |
| Cognitive support | 0.5-2 mg/kg/day | Common supplement practice, below the StatPearls 2 mg/kg reference point. |
| Memory and focus studies | 1-4 mg/kg, single dose | Rodriguez 2016 (280 mg single dose); animal work at 1 mg/kg. Not daily protocols. |
| Alzheimer's research dosing | 138 mg/day for 24 weeks | Wischik 2015 phase 2. A supervised clinical trial, not a supplement regimen. |
| Neuroprotection (animal models) | 0.5-1 mg/kg | Gonzalez-Lima and Auchter 2015. Animal data; no human equivalent. |
A row for mood support was removed from this table in September 2026. The 15-50 mg/day figure it carried did not trace to any study we could find, and methylene blue's interaction with serotonergic medication makes an unsourced mood-dosing number the worst kind of number to publish.
Quick Reference by Common Supplement Sizes
| Product Format | Typical Serving | Who It's For |
|---|---|---|
| 5 mg capsule | 1-2 capsules | Beginners, conservative users |
| 10 mg capsule | 1-2 capsules | Standard supplement use |
| 16 mg troche | 1/4 to 1 troche | Sublingual absorption |
| 0.5% liquid drops | Calculate by drops | Flexible dosing |
How to Calculate Your Dose
Step 1: Convert your weight to kilograms (divide pounds by 2.2)
Step 2: Multiply by your target mg/kg dose
Example: A 154-pound person wanting a standard 1 mg/kg dose:
- 154 ÷ 2.2 = 70 kg
- 70 kg × 1 mg/kg = 70 mg daily
For liquid products: Check the concentration. A 0.5% solution contains 5 mg per mL. A 1% solution contains 10 mg per mL.
The Safety Thresholds You Need to Know
Here is the part most dosage pages get wrong, including an earlier version of this one. These thresholds come from intravenous methylene blue given in hospitals, mostly for methemoglobinemia and vasoplegic shock. They are the only well-documented numbers that exist. Oral supplement use has no comparable safety literature, so these figures are being borrowed, and borrowed numbers deserve caution rather than confidence.
The StatPearls medical reference states that methylene blue is generally well tolerated at therapeutic doses below 2 mg/kg, and that doses above 7 mg/kg are associated with a markedly increased risk of adverse effects. Single intravenous doses of 3 mg/kg or more have produced hypotension and reduced oxygenation. Single doses of 20 mg/kg or more have caused severe hemolysis and death.
Serotonin syndrome: this is the risk that matters most for anyone taking an antidepressant. Serotonin syndrome has been reported when methylene blue is combined with serotonergic agents at doses around 5 mg/kg. The FDA has issued a boxed warning about the interaction. There is no established safe dose of methylene blue for someone taking an SSRI, SNRI or MAOI, and the honest answer is not a smaller number, it is a conversation with the prescribing doctor.
An earlier version of this page gave "above 250 mg total" as the serotonin syndrome threshold. That figure did not trace to any source we could find and has been replaced with what the literature actually reports.
What the Research Actually Used
If you want to know what doses published studies administered, here they are, with what was measured and how large the effect was:
Cognitive function, human, Rodriguez et al. 2016: a single 280 mg oral dose (about 4 mg/kg for a 70 kg adult) in 26 healthy adults. Functional MRI showed increased response in brain regions controlling short-term memory and attention, and a 7% increase in correct responses on a memory retrieval task. A single dose in a scanner, not a daily regimen.
Alzheimer's progression, human, Wischik et al. 2015: 321 people with mild to moderate Alzheimer's took 69, 138 or 228 mg a day for 24 weeks. The 138 mg dose showed the clearest slowing of cognitive decline. Notably, the highest dose did not outperform it, which is the hormetic pattern again: more was not better.
Neuroprotection, animal, Gonzalez-Lima and Auchter 2015: low doses in the 0.5-1 mg/kg range protected against neurodegeneration in rodent models. Animal data. It has not been reproduced in humans.
What is missing from that list is any long-term study of daily low-dose oral methylene blue in healthy adults, which is exactly what most supplement users are doing. That study has not been run.
Starting Low: A Sensible Approach
Regardless of your target dose, starting low makes sense for several reasons. You can assess your tolerance, identify any sensitivity, and find your personal optimal dose without overshooting.
Week 1: Start at 0.5 mg/kg or 10-15 mg total, whichever is lower
Week 2: If tolerated well, increase to 1 mg/kg or your target low dose
Week 3 and beyond: Adjust based on response, staying within the 0.5-2 mg/kg range for unsupervised use
Some people find their sweet spot at very low doses. Others need the higher end of the range. The only way to know is to start conservatively and pay attention.
When Not to Use Methylene Blue
Certain situations make methylene blue inappropriate regardless of dose:
G6PD deficiency: Methylene blue can trigger hemolytic anemia in people with this genetic condition. If you don't know your G6PD status and have Mediterranean, African, or Asian ancestry (where the deficiency is more common), consider testing first.
Serotonergic medications: SSRIs, SNRIs, MAOIs, and other medications that affect serotonin create a risk of serotonin syndrome when combined with methylene blue. The FDA has issued a boxed warning about this interaction.
Pregnancy and breastfeeding: Insufficient safety data exists. Avoid use.
Renal impairment: Methylene blue is primarily excreted through the kidneys. Severe kidney disease requires dose adjustment or avoidance.
Timing and Administration
Best time to take it: Morning or early afternoon. Methylene blue can be mildly stimulating, and taking it late may affect sleep.
With or without food: Taking it with food may reduce stomach upset, though many people tolerate it fine on an empty stomach.
Frequency: Most protocols use once-daily dosing. Some split into two doses (morning and midday) for sustained effect.
What to expect: Blue or green-tinged urine is normal and harmless. It simply indicates the compound is being processed.
Quality Matters
Methylene blue exists in multiple grades, and they are not interchangeable:
USP/Pharmaceutical grade: Tested for purity, appropriate for human use
Laboratory/Reagent grade: May contain contaminants not suitable for consumption
Industrial/Textile grade: Never appropriate for human use
Always verify that any methylene blue supplement you purchase is pharmaceutical grade (USP) with third-party testing for purity. The compound's history as an industrial dye means low-quality products absolutely exist in the market.
The Bottom Line
For most people exploring methylene blue for cognitive support, the commonly used range is 0.5-2 mg/kg daily, with many finding benefit at the lower end. Starting at 10-15 mg or 0.5 mg/kg, whichever is lower, and assessing tolerance for a week is the conservative approach.
Being straight about the evidence: short-term human studies support a cognitive effect, and the intravenous safety literature is reasonably well established below 2 mg/kg. What does not exist is long-term safety data for daily oral use in healthy people. Anyone taking serotonergic medication should not be working from a chart at all, including this one. Talk to your doctor.
Updated September 2026. This revision corrected a misattributed author, corrected the year of the Progress in Neurobiology review, replaced a paraphrase that had been presented as a direct quotation from StatPearls, removed an unsourced serotonin syndrome threshold and an unsourced mood-support dose range, and added the context that the published safety thresholds come from intravenous clinical use.
References
- Rojas, J. C., Bruchey, A. K., & Gonzalez-Lima, F. (2012). Neurometabolic mechanisms for memory enhancement and neuroprotection of methylene blue. Progress in Neurobiology, 96(1), 32-45.
- Rodriguez, P., Zhou, W., Barrett, D. W., et al. (2016). Methylene blue modulates functional connectivity in the human brain. Brain Imaging and Behavior, 10(3), 715-725.
- Wischik, C. M., Staff, R. T., Wischik, D. J., Bentham, P., Murray, A. D., Storey, J. M. D., Kook, K. A., & Harrington, C. R. (2015). Tau aggregation inhibitor therapy: an exploratory phase 2 study in mild or moderate Alzheimer's disease. Journal of Alzheimer's Disease, 44(2), 705-720.
- Rahman, M., & Sharma, S. (2023). Methylene Blue. StatPearls. StatPearls Publishing. NCBI Bookshelf.
- FDA. (2021). PROVAYBLUE (methylene blue) Prescribing Information. AccessData FDA.
- Oz, M., Lorke, D. E., & Petroianu, G. A. (2009). Methylene blue and Alzheimer's disease. Biochemical Pharmacology, 78(8), 927-932.
- Gonzalez-Lima, F., & Auchter, A. (2015). Protection against neurodegeneration with low-dose methylene blue and near-infrared light. Frontiers in Cellular Neuroscience, 9, 179.
Robert
Some times I will do my drops in water By my body weight my urine
Stay’s blue all day, after that bottle runs out . I will open a new bottle
The same Way nothing i feel fatigue
And no blue urine. Are they selling me Good bottle ’mixed with bad ?