Methylene Blue Brands

Lab-Tested & Ranked

Independent water and lab testing of nearly 100 methylene blue brands. Two-thirds failed for purity or dose. See which pass, and which to avoid, before you buy.

65 Products Tested
23 (35.4%) Passed Independent Testing
42 (64.6%) Failed Independent Testing
33 Not Yet Tested
Before taking any methylene blue: it can interact dangerously with SSRIs, SNRIs, and other serotonergic medications. See the Adverse Medications List →
Score Brand Product Claimed Amount Water Test Lab Test Seller Country
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Testing Methodology

Water Test: Each product was dissolved in water and observed for deep blue coloration characteristic of methylene blue. Deep Blue = PASS; Brown, Amber, Tan, Clear, or Weak Blue = FAIL.

Lab Test: Third-party laboratory analysis measured actual methylene blue content. Detected amount within ±20% of label claim = PASS; 0 mg detected or outside ±20% = FAIL.

Brand Score
A  Verified authentic & accurate (lab test passed) B  Visually authentic, potency untested (water pass, no lab) F  Failed the water or lab test NR  Not yet rated

Methylene Blue Testing: Frequently Asked Questions

How many methylene blue brands actually pass independent lab testing?
Of 65 methylene blue products we independently water-tested and lab-tested, 23 (35.4%) passed both tests and 42 (64.6%) failed. A product passes only when the water test shows a clean, vivid blue solution and the lab assay confirms the methylene blue content is close to the amount claimed on the label.
How can you tell if methylene blue is real or fake?
Dissolve the product in water: pure USP-grade methylene blue produces a clear, vivid blue solution, while brown, green, or murky water points to fillers, impurities, or oxidation. A laboratory assay then confirms whether the actual milligrams of methylene blue match what the label claims. See how third-party testing works.
Are USA-made methylene blue brands better than ones shipped from China?
Country of origin alone does not guarantee quality, but in our testing a large share of failing products were sold by overseas sellers. Every product in this database lists its seller's country, so you can filter and compare USA-based and overseas brands directly before you buy.
Does real methylene blue turn your urine blue or green?
Yes, genuine methylene blue is excreted by the kidneys and commonly tints urine blue-green, though the effect varies with dose and hydration. A complete absence of any color change can sometimes indicate an underdosed or low-purity product. Read why methylene blue turns your pee blue.
What does it mean when a methylene blue product fails the water test?
Cloudy, brown, or greenish water after dissolving indicates fillers, contaminants, or degraded methylene blue rather than pure pharmaceutical-grade material. Products that fail the water test typically also under-deliver on their labeled dose when sent for laboratory assay.
Why are some products marked “not yet tested”?
33 products in this database are listed for reference but have not completed our water and lab testing yet. Their score shows as “NR” (not rated) until results are in, and we update the database as new test results are completed.

These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes and is not medical advice; consult a qualified healthcare provider before use.