Methylene Blue Reviews 2026: Top Brands & Research

Written by the NooBlue editorial team. We make and sell methylene blue, so read our first place as our opinion and check the competitor figures yourself. Each one is linked in the sources at the end.

Search for methylene blue reviews and two kinds of post come back. One is the enthusiast who put a few drops in water and felt sharper by lunch. The other is the one-star complaint about a stained tongue, a leaking dropper or a bottle that did nothing. Both tell you something. Neither tells you what is in the bottle.

This guide fills that gap. For eight brands that keep turning up in review searches, we recorded what each one sells, how much methylene blue sits in one drop, capsule or gummy, what 5 mg costs, which lab paperwork you can read before you pay, and what buyers say about it. Then we set the reviews next to the research, because a review can tell you what one person felt but not what the compound does.

Methylene blue brands at a glance

Every row uses the same units. Cost per 5 mg is the listed price divided by the total milligrams of methylene blue in the pack, multiplied by five. Prices are single-pack prices on each brand’s own store, except Nootlyn, which sells through Amazon.

How we ranked the brands

We did not test any of these products in a lab, and we do not claim to. This ranking weighs what a buyer can check before paying, in this order:

1. A clear amount per unit. The label should say how many milligrams are in one drop, capsule or gummy, and the smallest step should be small enough to start low.
2. Paperwork you can read. A report from a named lab, posted where you can see it, counts for more than a “third-party tested” badge. A report that measures methylene blue content counts for more than one that only screens for heavy metals.
3. Sold for daily use by people. We checked whether a product is presented as something to take, with directions, or is listed as a lab reagent or “for research purposes only”.
4. Cost per 5 mg. One unit that works across drops, capsules and gummies.
5. Reviews. Volume, consistency and what complaint sites say. We report star ratings but give them little weight, for reasons set out further down.

Purity percentages appear where a brand states one, but we did not score them. The USP monograph for methylene blue allows 97.0% to 103.0% methylene blue on the dried basis, so a precise label figure such as “99.99%” is a separate claim that needs its own report. Without that report, the number is marketing. Our explainer on what 99% USP means goes further into purity claims, and our USP grade guide covers what the grade does and does not promise.

The 8 methylene blue brands, ranked

1. NooBlue: our pick

What it sells: Ultimate Methylene Blue Capsules (60 capsules, each with 5 mg of methylene blue and 10 mg of vitamin C, $37.99), Methylene Blue Gummies (60 gummies, each with 10 mg of methylene blue and 25 mg of vitamin C, $49.99) and Methylene Blue Drops (a 1% USP solution, 50 mL, $29.99). Methylene blue is the only thing NooBlue makes.

NooBlue is first because every unit has a stated amount and the steps are small. One drop is 0.5 mg, ten drops are 5 mg and a full dropper is 10 mg. The capsule is a fixed 5 mg, the lowest fixed capsule amount in this list, taken once a day with food. The gummy is a Wild Blueberry pectin chew with 10 mg of methylene blue, 25 mg of vitamin C and zero sugar. You can start low and stay with one brand while you work out what suits you. Our guide to how many mg of methylene blue per day explains how people usually step up.

The paperwork is published, and it is specific about its limits. Contract Testing Laboratories of America (CTLA) analyzed the methylene blue ingredient, lot 2025022801, in report 135621. The report records an HPLC identity result of “Conforms” and individual results for arsenic, cadmium, mercury and lead. It covers the raw ingredient, not every finished batch, and it does not state a numerical purity percentage. Our guide to reading a Certificate of Analysis shows how to check a report like this one.

In the gummy, vitamin C can donate electrons to methylene blue and shift it toward leucomethylene blue, its colorless reduced form, which is why NooBlue gummies don’t leave the blue mouth that drops can. Our leucomethylene blue explainer covers the chemistry.

Two bottles save 10%, three save 15% and five save 20%. Orders over $100 ship free worldwide, returns are accepted for 30 days, and orders dispatch in 1–2 business days with tracking.

Who it suits: people who want to start low and change format without changing brand. Who should look elsewhere: anyone who wants the lowest price per milligram, since five of the brands below cost less per 5 mg than our cheapest format, and anyone who wants a potency result for every finished lot, which our published report does not provide.

2. Nutricel: lot-specific certificates for finished capsules

What it sells: Blue Boost capsules, a 1% solution called Blue Liquid, and blends that pair methylene blue with other ingredients.

Blue Boost is Nutricel’s flagship capsule. Each capsule holds 12 mg of USP grade methylene blue, 35 mg of vitamin C ester (ascorbyl palmitate) and 235 mg of organic cacao powder. A 60-capsule bottle costs $34.90, which works out at $0.24 per 5 mg, less than any NooBlue product.

Nutricel’s paperwork goes further than most. Its certificates page says Eurofins tests every product after bottling for heavy metals and microbes, and that methylene blue content is checked against the label on Blue Boost. The Blue Boost certificate there was tested in July 2025. The same page gives 99.4% as the purity of the raw methylene blue. The product page carries a clear safety notice covering SSRIs, SNRIs, MAOIs, pregnancy and children, and it warns that an evening dose may affect sleep.

On Amazon, the 60-capsule Blue Boost listing shows 4.3 out of 5 from 1,729 ratings.

Who it suits: capsule buyers who want certificates on the finished product. Who should look elsewhere: anyone who wants a single serving below 12 mg, or methylene blue on its own without cacao and vitamin C ester. Our Nutricel vs NooBlue comparison puts the two brands side by side.

3. Chemist Labs: 10 mg capsules with lot reports listed

What it sells: Methylene Blue Capsules at 10 mg each, plus 1% and 2% liquids.

Each capsule holds 10 mg of methylene blue that the label describes as 99% pure USP grade. The brand store charges $34.99 for 60 capsules and $44.99 for 120. At the 60-count price, 5 mg costs $0.29. The product page says every batch is third-party tested, and a separate lab reports page lists certificates by capsule lot number. We saw the list but did not audit the documents themselves. The safety notice covers SSRIs, pregnancy, nursing and children, and it names diphenhydramine as an antihistamine that may interact.

The Amazon listing carries the Amazon’s Choice badge and shows 4.3 out of 5 from about 690 ratings.

Who it suits: people who have settled on 10 mg and want a simple capsule at a low price. Who should look elsewhere: first-time buyers who want to start at 5 mg or less. Our methylene blue capsules comparison covers more options in this format.

4. Meraki Medicinal: small 0.25 mg drops and a large review base

What it sells: Meraki Blu, a methylene blue solution with 150 mg in a 30 mL bottle and a 1 mL dropper.

Meraki’s page puts each drop at about 0.25 mg and says 5 mg takes 20 drops, which makes very small starting amounts easy. The strength needs a careful read. 150 mg in 30 mL is 5 mg per mL, a 0.5% solution, while the Amazon listing title calls it a “1% Formula”. A buyer who doses it like a typical 1% product gets half the amount they expect.

One bottle costs $35.00, two cost $65.00 and three cost $89.00, so 5 mg costs $1.17 at the single price, the highest of any drops here. The product page shows certificates from 3 Light Labs for heavy metals, formaldehyde and microbes. We found no assay of methylene blue content among them, and the lot field on the certificates is blank. The product description says “For research purposes only” and also warns against use with antidepressants or SSRIs, in pregnancy, while nursing and under 18.

Reviews are Meraki’s strength. The widget on its own page shows 4.47 out of 5 from 10,564 ratings, and the Amazon listing shows 4.3 out of 5 from 939 ratings. Amazon’s summary of those reviews says some buyers feel nothing, opinions on value are mixed, and some mention headaches. The full Meraki methylene blue review goes through each certificate line by line.

Who it suits: people who want the finest drop-by-drop steps. Who should look elsewhere: anyone on a budget, and anyone who wants a report that measures methylene blue content.

5. Earth Harmony: a 12 mg capsule with added botanicals

What it sells: Ultimate Methylene Blue capsules and a liquid.

Each capsule holds 12 mg of methylene blue with vitamin C and a plant blend of organic berberine, chlorophyllin and chlorophyll. Sixty capsules cost $39.95, or $0.28 per 5 mg. The page calls the methylene blue “99.99% USP / pharmaceutical grade” and says all products get third-party testing, but no certificate appears on the product page. The capsules are made in Phoenix, Arizona, and the page warns about pregnancy, nursing, G6PD and MAO inhibitors. The brand’s own page shows 4.6 out of 5 from 35 reviews.

Who it suits: people who want a blend rather than methylene blue alone. Who should look elsewhere: anyone who wants to see a certificate before buying, or who wants methylene blue without extra actives.

6. Biopharm: a plain 1% USP solution

What it sells: Methylene Blue 1%, USP (Pharmaceutical) Grade in glass and plastic bottles.

Biopharm’s product page says one drop holds 0.5 mg, the same step as our drops. A 50 mL glass bottle with a dropper costs $25.97 and a 60 mL plastic bottle costs $24.97, which puts 5 mg at $0.26 and $0.21. For a limited time the store also offers two 50 mL glass bottles for the price of one. The page says the products get additional testing from third-party analysts, and orders ship free to the lower 48 states. It gives no suggested use and no safety warnings, and the product’s structured data files it under laboratory chemicals, next to the pH buffers the company also sells.

Who it suits: experienced users who already know their amount and want a low price. Who should look elsewhere: beginners who want directions and warnings on the page. Our Biopharm methylene blue review covers the brand in detail.

7. Nootlyn: the lowest cost per milligram we found

What it sells: Methylene Blue Drops 5%, a 120 mL glass bottle sold on Amazon. We found no brand store, and nootlyn.com did not resolve when we checked.

This is the product behind most Nootlyn methylene blue review searches, and it is a different kind of product from the 1% solutions above. The listing says each drop delivers about 2.5 mg and four drops give 10 mg. A 5% solution holds 50 mg per mL, five times the strength of a 1% solution. The dropper has no printed markings, which the listing says is deliberate, to keep ink out of the formula.

At $29.99 for 120 mL, the bottle holds about 6,000 mg of methylene blue, so 5 mg costs about $0.025. Nothing else here comes close on price. The listing title claims “99.99% Purity USP”, but the listing text names no lab and shows no certificate that we could find. Amazon files it under Industrial & Scientific, in the Inorganic Reagents category, even though the title says it is for humans.

The ratings are good: 4.3 out of 5 from 559 of them. Amazon’s summary says buyers report more energy, better focus and good value, while taste and color get mixed comments and some buyers say it stains teeth and lips. The written reviews also show the main risk of a 5% solution. One buyer writes that they used to take 30 drops of a 1% product and now take 10 drops of Nootlyn “for the same dosage”. Thirty drops of a 1% solution at 0.5 mg each is 15 mg. Ten drops at 2.5 mg each is 25 mg, two-thirds more than before. Another buyer takes “a full dropper” every morning, and with no markings on the dropper there is no easy way to know how many milligrams that is.

Who it suits: experienced users who know their amount, want the lowest cost and can count single drops with care. Who should look elsewhere: beginners, anyone who wants to start below 2.5 mg, and anyone who wants to see a lab report first. If this is pushing you toward a fixed amount per unit, our capsules vs liquid comparison sets out the trade-offs.

8. TRUEHEALTHIC: 5 mg gummies with mixed off-site reviews

What it sells: Methylene Blue Gummies, plus capsules and 1% drops.

Each gummy holds 5 mg of USP grade methylene blue, 30 to a bag, for $29.99 on the brand store, so 5 mg costs $1.00 and a 10 mg day costs $2.00. The page claims “99.9% Pure” and shows a lab report image from ClearCert Laboratories for one gummy lot. That report lists heavy metal results and marks methylene blue as “Conforms”, but it gives no purity percentage and no milligram assay.

Off-site feedback is weaker than the product page suggests. On Trustpilot the company has a TrustScore of 2.5 out of 5 from 60 reviews. The complaints center on recurring $49.99 VIP membership charges that reviewers say they did not agree to, and on trouble canceling. The company had replied to 97% of negative reviews when we checked. The TRUEHEALTHIC gummies review covers the lab report and the claims on the product page.

Who it suits: people who want a low 5 mg gummy. Who should look elsewhere: anyone who wants 10 mg in one gummy, and anyone wary of subscription add-ons. For the wider gummy market, see our best methylene blue gummies comparison.

Other brands you will see in reviews

Troscriptions sells Just Blue troches at 16 mg each, four to a pack, for $27, but its site now says its products are available only through healthcare practitioners, so we left it out of the ranking. Blue Organics and Supreme also come up often in review searches. We cover them in our Blue Organics review and our Supreme methylene blue review.

For a brand-level comparison with a slightly different set of names, see our top methylene blue brands guide. For single products ranked on the same numbers, see our best methylene blue supplements comparison.

What star ratings tell you, and what they hide

Of the Amazon listings we checked, four have more than 500 ratings each: Nutricel, Chemist Labs, Meraki and Nootlyn. All four sit at 4.3 out of 5. TRUEHEALTHIC’s gummy listing, with 384 ratings, sits at 3.8. Their paperwork runs from lot-specific certificates on the finished product down to nothing at all, and their cost per 5 mg runs from about $0.025 to $1.17. If star averages tracked quality, those four numbers would spread out. They do not.

The reason is simple. A star average records how a product felt to the people who rated it. No reviewer can measure at home whether a bottle holds the amount on its label, so the rating cannot tell you that. Ratings also blend people taking very different amounts. The Nootlyn buyer who went from 15 mg to 25 mg without noticing was not rating the same experience as someone taking 5 mg.

Treat a large rating count as a sign that a product has sold widely for a while, not as a sign of quality. Then read the written reviews and give the most weight to the ones that state an amount, a format, a time of day and how many weeks the person kept going. Those you can compare with your own experience. A review that only says the product is amazing tells you almost nothing.

What reviewers praise and what they complain about

Across the brands we read, the praise is steady: more energy, clearer focus and an afternoon without the slump. The complaints repeat just as reliably.

• Staining. Liquids stain the tongue, teeth, lips, fingers and counters. Nootlyn and MaxLife reviewers both mention it, and one Nootlyn buyer drinks the diluted dose from a wide cup so it does not wash around the mouth.
• Taste. Some buyers find liquid methylene blue bitter. Others barely notice it once it is mixed into water or juice.
• Headaches. Amazon’s review summary for Meraki Blu notes headaches among some buyers.
• Sleep. Nutricel’s own page warns that an evening dose may affect sleep, and a Nootlyn reviewer says it keeps them awake if taken after lunch.
• Blue urine. This surprises first-time users. In a 2017 imaging study, only the people given methylene blue reported colored urine afterward.
• No effect. Some buyers feel no change at all, which Amazon’s summary for Meraki Blu also records.

Many of these complaints are about amount and format rather than brand. Liquids bring the bitter taste and most of the mess. Capsules avoid both, and gummies swap the bitterness for a flavored chew. A strong solution measured with an unmarked dropper can deliver far more than intended. Our comparison of liquid and capsule absorption explains why the choice comes down mostly to routine, and the gummies vs capsules guide covers the two solid formats.

Five red flags in methylene blue reviews and listings

Some patterns point to a real problem with a product or a listing. These are the five worth checking before you order any brand, ours included.

A purity number with no report behind it

“99.99% pure” in a product title means little on its own. USP grade allows anything from 97.0% to 103.0% on the dried basis, so a precise figure is a separate claim, and it needs a report you can read. Nootlyn’s title and Earth Harmony’s product page both print 99.99% with no certificate on the page.

A report that does not test what the label claims

Many brands post a lab document, so read what it actually measures. Meraki’s published certificates cover heavy metals, formaldehyde and microbes, with no methylene blue assay. TRUEHEALTHIC’s gummy report marks methylene blue as “Conforms” with no percentage. Our own CTLA report confirms identity and lists heavy metals for the raw ingredient, with no purity percentage and no finished-batch result. A report that measures methylene blue content in the finished product, as Nutricel’s does for Blue Boost, tells you the most. Our guide on how to test if methylene blue is real covers what you can and cannot check at home.

A strength you cannot dose accurately

Check the concentration and the drop size before you check the stars. A 5% solution at 2.5 mg per drop, sold with an unmarked dropper, makes it easy to take several times more than you meant to. A bottle called 1% in one place that holds 5 mg per mL makes it easy to take half. Capsules and gummies with a stated amount per unit avoid both problems.

Lab reagent wording on a product sold for daily use

Some listings sit in reagent categories or carry wording such as “For research purposes only”, while the title or the reviews talk about daily use. Aquarium methylene blue is a separate product: Kordon’s 2.303% solution says it is not intended for human consumption. If a label will not say a product is meant for people, take it at its word. Our guide to finding methylene blue in stores and pharmacies explains the grades you will see on shelves.

Review patterns that look manufactured

Be wary of review sections where many short five-star reviews land within a few days, where different reviewers use the same sentence with only the product name changed, or where a product page shows near-perfect scores while complaint sites tell another story. The last one is easy to check. Search the brand on Trustpilot and the Better Business Bureau before you order. Our Blue Organics write-up shows what that search can turn up.

What the research says about methylene blue

Reviews tell you what people felt. Studies tell you what has been measured, and for methylene blue as a daily supplement that list is short.

The mechanism. A 2018 review in Molecular Neurobiology by Tucker, Lu and Zhang describes how methylene blue can pass electrons from NADH straight to cytochrome c in the mitochondrial electron transport chain, which raises the activity of complex IV. Most of the supporting work is in cells and animal models. That work helps explain why buyers talk about “clean energy”, but it is not evidence that a supplement does the same thing in you.

The human imaging studies. In a randomized, double-blind, placebo-controlled trial published in Radiology in 2016, Rodriguez and colleagues enrolled 26 healthy adults aged 22 to 62. Each took either a single oral dose of 280 mg of methylene blue (about 4 mg/kg) or a placebo, and was scanned an hour later. The methylene blue group showed more brain activity during attention and short-term memory tasks, and a 7% increase in correct answers during memory retrieval. A follow-up from the same team, published in Brain Imaging and Behavior in 2017, enrolled 28 participants at the same single 280 mg dose. It found changes in resting-state connectivity and in blood flow during a visual-motor task, and no effect on reaction time.

Keep the scale in mind. 280 mg is 28 times a 10 mg serving, taken once and measured an hour later. Neither study tested daily use at supplement amounts, and neither followed people for weeks. Writing in The Conversation in 2025, pharmacologist Lorne Hofseth of the University of South Carolina summed up the evidence: most of what is known about methylene blue and the brain comes from rats and lab dishes, and much larger, longer trials are needed. A 2022 review in Toxicology Research went further and called its clinical use controversial, because basic toxicology data are lacking.

What has not been shown. We found no trial showing that daily methylene blue at 5 to 15 mg improves focus, memory or energy in healthy adults over weeks or months. Reviews that describe those effects describe personal experience, not a measured result. For a longer walk through the studies, see our guide to methylene blue benefits.

Who should not take methylene blue

These warnings apply to every brand in this guide, including ours.

• Serotonergic medicines. Methylene blue is a potent inhibitor of monoamine oxidase A, the enzyme that breaks down serotonin. A 2007 laboratory study by Ramsay, Dunford and Gillman confirmed this and linked it to serotonin toxicity in people taking SSRIs. Do not combine methylene blue with SSRIs, SNRIs, MAOIs or other serotonergic medicines. Agitation, confusion, fever, a racing heart or muscle stiffness after combining them needs urgent medical care. Our list of what not to take with methylene blue covers the other interactions.
• G6PD deficiency. A 2010 evidence review in Drug Safety found solid evidence to avoid only seven medicines in people with G6PD deficiency, and methylene blue was one of them, because it can make red blood cells break down. If you are not sure of your G6PD status, ask your doctor about a test before you start.
• Pregnancy and breastfeeding. Do not take methylene blue while pregnant or breastfeeding.
• Other medicines. Talk to your doctor before you start if you take any prescription medicine. Chemist Labs and Nutricel both warn that common antihistamines such as diphenhydramine may interact.

Our methylene blue side effects guide covers the milder effects, such as blue urine, stomach upset and headaches, in more detail.

Frequently asked questions about methylene blue reviews

What is the best methylene blue brand?

NooBlue is our pick, and we make it, so weigh that. It offers three formats with a stated amount in every unit, from a 0.5 mg drop to a 10 mg gummy, and a named lab’s ingredient report on each product page. If price per milligram matters most, Nootlyn and Biopharm cost less, and Nutricel posts certificates for its finished capsules.

What brand of methylene blue is legit?

A legitimate brand tells you how much methylene blue is in each unit, names the lab behind its report and shows you that report, says what the report covers, and sells the product with directions for people rather than as a lab reagent. Check each of those on the product page before you trust the reviews. Nutricel, for example, posts lot-specific certificates for its finished capsules. Our report covers the raw ingredient rather than each finished batch, and we say so on every product page.

Why don’t doctors recommend methylene blue?

Mostly because the evidence for everyday use is thin and the interactions are serious. Most brain research on methylene blue is in animals and cells, and the two human imaging studies used a single 280 mg dose rather than daily supplement amounts. Larger, longer trials have not been done. At the same time, it interacts with serotonergic medicines, it must be avoided with G6PD deficiency and in pregnancy, and products sold online range from human supplements to lab reagents. Doctors do use methylene blue in hospitals for specific medical situations, at doses and with monitoring that have nothing to do with a daily supplement.

Why do I feel so good on methylene blue?

People who feel a lift usually describe more energy and a brighter mood. Two properties may contribute. Methylene blue is a potent inhibitor of monoamine oxidase A, the enzyme that breaks down serotonin, which is also why it interacts with serotonergic medicines. In cells and animals it can also pass electrons along the mitochondrial energy chain. Expectation can play a part as well, which is why controlled trials use a placebo group and reviews have none. None of this has been measured for daily supplement amounts in people over months.

How long should I take methylene blue before I judge it?

No study sets a trial period for supplement amounts. A fair personal test is a fixed amount at the same time each day for four weeks, with notes on sleep, afternoon energy and anything else you care about, and without changing other supplements at the same time. Stop and talk to your doctor if anything worries you.

Why do reviews for the same brand swing between five stars and one star?

Because reviewers are rarely describing the same thing. They take different amounts, in different formats, at different times of day, with different expectations. Some take it with medicines that interact. Some one-star reviews are about shipping or a leaking bottle rather than the contents. Reviews that state the amount and format are the only ones you can line up against each other.

Are capsule reviews more reliable than liquid reviews?

They are easier to compare, because every reviewer took the same stated amount. Liquid reviews mix people taking different numbers of drops, and the Nootlyn reviews above show how easily the total changes when the strength changes. That does not make liquids worse, only harder to judge from reviews.

What does it mean if a methylene blue brand has almost no reviews?

Less than most buyers assume. A brand that launched recently, or one that sells direct rather than through a marketplace, can be sound with a thin review count. Judge it on what it publishes instead: the amount per unit, a report from a named lab, a lot number and a clear statement of what the report covers. The real warning sign runs the other way: a flood of five-star reviews in a short window on a listing that shows no test results at all.

What’s the downside of methylene blue?

Liquids stain teeth, fingers and anything they touch, and some people find the taste bitter. Urine can turn blue or green. Some buyers report headaches, and a dose taken late in the day can disrupt sleep. The serious downside is the interaction: methylene blue inhibits monoamine oxidase A, so taking it with SSRIs, SNRIs or other serotonergic medicines can cause serotonin toxicity. It must also be avoided with G6PD deficiency and in pregnancy, and there are no long-term human trials at supplement amounts. Our side effects guide covers each one in detail.

The verdict

NooBlue is our pick for most people who have read their way through methylene blue reviews: three formats with a stated amount in every unit, a named lab’s ingredient report on every product page, and the limits of that report stated plainly. Nutricel is the choice for certificates on the finished product, and Nootlyn for the lowest cost per milligram, if you can measure a 2.5 mg drop with care. Whatever you buy, read the report, check the strength, and clear it with your doctor if you take any medicine.

New to methylene blue? Our beginner’s guide walks through a first bottle, and our guide to methylene blue for athletes covers training days. NooBlue ships worldwide, and if you are ordering from Australia, our guide to buying methylene blue in Australia covers delivery there. You can also compare all three formats in the NooBlue shop.

Sources

1. Rodriguez P, Zhou W, Barrett DW, et al. Multimodal randomized functional MR imaging of the effects of methylene blue in the human brain. Radiology. 2016;281(2):516-526. PubMed 27351678
2. Rodriguez P, Singh AP, Malloy KE, et al. Methylene blue modulates functional connectivity in the human brain. Brain Imaging and Behavior. 2017;11(3):640-648. PMC5018244
3. Tucker D, Lu Y, Zhang Q. From mitochondrial function to neuroprotection: an emerging role for methylene blue. Molecular Neurobiology. 2018;55(6):5137-5153. PubMed 28840449
4. Ramsay RR, Dunford C, Gillman PK. Methylene blue and serotonin toxicity: inhibition of monoamine oxidase A (MAO A) confirms a theoretical prediction. British Journal of Pharmacology. 2007;152(6):946-951. PubMed 17721552
5. Youngster I, Arcavi L, Schechmaster R, et al. Medications and glucose-6-phosphate dehydrogenase deficiency: an evidence-based review. Drug Safety. 2010;33(9):713-726. PubMed 20701405
6. Bužga M, Machytka E, Dvořáčková E, et al. Methylene blue: a controversial diagnostic acid and medication? Toxicology Research. 2022;11(5):711-717. PMC9618115
7. Hofseth LJ. Is methylene blue really a brain booster? A pharmacologist explains the science. The Conversation. 2025. theconversation.com
8. USP–NF. Methylene Blue monograph (definition: NLT 97.0% and NMT 103.0%, dried basis). doi.usp.org
9. Brand and listing pages read in September 2026: Nutricel Blue Boost, Nutricel certificates, Chemist Labs capsules, Meraki Blu, Earth Harmony capsules, Biopharm 1% USP, Nootlyn 5% on Amazon, TRUEHEALTHIC gummies, TRUEHEALTHIC on Trustpilot, Troscriptions Just Blue, Kordon Methylene Blue.