Best Over-The-Counter Methylene Blue Supplements in 2026: 8 OTC Brands Compared

Written by the NooBlue editorial team. We make and sell methylene blue capsules, gummies and drops. We did not lab-test any product in this guide. Every figure comes from a brand’s own page, its published lab paperwork or a peer-reviewed study, and all of them are listed in the sources at the end.

Methylene blue sits in an odd place. The version hospitals use is a prescription injection. The version most people buy is a dietary supplement sold online as capsules, gummies, tablets or drops, and none of those need a prescription. Between the two sits a grey zone of lab chemicals, aquarium remedies and “research use only” liquids that are easy to order and not made for people.

This guide covers the supplement side. It compares eight over-the-counter brands you can order in the US today, with the same arithmetic for every row, and explains what to avoid. For each one we give the milligrams per unit, the price, the cost per 5 mg, the lab paperwork behind the purity claim, and who it suits.

Best OTC methylene blue supplements at a glance

Prices are as of Sep 2026, read from each brand’s own store unless the row says Amazon, before shipping, coupons and multi-pack discounts. Cost per 5 mg is the price divided by the total milligrams of methylene blue in the pack, times five.

NooBlue’s drops hold 500 mg of methylene blue in 50 mL, about 100 servings of 5 mg. LVLUP shows $80.99 for subscribe and save. MaxLife’s listing showed a price range up to $34.98 depending on the offer.

What “over the counter” means for methylene blue

There are four ways to get methylene blue in the US, and only one of them is truly over the counter.

• Dietary supplements (no prescription). Capsules, gummies, tablets and drops sold by supplement brands, online or through Amazon. Everything ranked in this guide is in this group.
• Prescription methylene blue. The injectable hospital medicine is prescription-only and given by clinicians. Telehealth services such as Healthspan also prescribe oral methylene blue after a clinician review, for $99 a month including the prescription, pharmacy delivery and support.
• Compounded capsules. Compounding pharmacies such as Empower Pharmacy make methylene blue capsules in several strengths, and a prescription is required.
• Practitioner-only brands. Some brands sell only through healthcare practitioners. Troscriptions, maker of the Just Blue troche, now says its products are available exclusively through practitioners, so we no longer list it here.

High-street pharmacies rarely stock supplement methylene blue, so “over the counter” in practice usually means “online without a prescription”. Our guides to whether you need a prescription for methylene blue and finding methylene blue in health food stores and pharmacies go into both questions.

The trade-off of buying without a prescription is that nobody checks your medicines for you. That makes the safety section below more important, not less.

How we ranked the best OTC methylene blue supplements

We did not run lab tests, and we do not claim to have. This is a comparison of what each brand states and publishes, and you can check every line against the same pages. We weighed six things.

1. Smallest dose. The lowest amount you can take without splitting anything. Most guidance on methylene blue is to start low and increase slowly.
2. Paperwork. A lot-numbered certificate from a named laboratory, published before you buy, ranks above a claim of testing with no document. We say what each document covers: an ingredient report tests the raw methylene blue, and a finished-product certificate tests a batch of capsules or gummies.
3. Cost per 5 mg. Worked out from the total milligrams in the pack, so a two-capsule serving compares fairly with a one-capsule serving.
4. Format choice. Capsules, gummies, tablets and drops each suit different people.
5. Other ingredients. Vitamin C, cacao, berberine or a stack of mitochondrial nutrients can be a plus or an unwanted variable. We list them.
6. Safety information. Whether the page warns about serotonergic medicines, G6PD deficiency and pregnancy.

Star ratings count for little. A rating cannot tell you what is in a capsule, and review systems differ by store. Where a page shows one, we quote it as it read on the day we checked.

NooBlue ranks first because it offers a 5 mg capsule, a gummy and a 1% solution from one brand, with its ingredient report on the product page. It does not win on cost per milligram, and the entries below say so.

The 8 best OTC methylene blue supplements, ranked

These are the eight over-the-counter brands we would consider in the US in 2026, from our own range at #1 to a four-ingredient stack at #8.

1. NooBlue Methylene Blue: best overall

NooBlue makes three methylene blue products, and they are our pick for most people buying without a prescription. All three use USP grade methylene blue.

• Ultimate Methylene Blue Capsules: 5 mg of methylene blue and 10 mg of vitamin C in a vegetable capsule, 60 for $37.99 (regular price $49.99). That is $0.63 a capsule.
• Methylene Blue Gummies: 10 mg of methylene blue and 25 mg of vitamin C per gummy, 0 g of sugar, 60 for $49.99. That is $0.83 a gummy, or $0.42 per 5 mg. They don’t leave the blue mouth that drops can.
• Methylene Blue Drops: a 1% solution at 0.5 mg per drop, so 10 drops make 5 mg and a full dropper of 20 drops makes 10 mg. A 50 mL bottle costs $29.99 (regular price $39.99) and gives about 100 servings of 5 mg, or $0.30 each.

The case for NooBlue is the starting dose and the choice. A 5 mg capsule, one a day, lets you start lower than any of the 10 mg or 12 mg capsules in this guide. If you would rather chew than swallow, the gummy is there. If you want the finest control, the drops go down to 0.5 mg. You can buy one of each format for $100 instead of $117.97, which also clears the free-shipping threshold.

The lab paperwork is on the product pages. 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. That is ingredient-level evidence. It does not state a numerical purity percentage or test every finished batch. Nutricel (#2) publishes a certificate for a finished lot, which is a stronger kind of document.

On price, be realistic. Our capsules cost more per milligram than most capsules here. What you pay for is the small step. Two bottles cost 10% less each, three bottles 15% less and five bottles 20% less. Orders over $100 ship free worldwide, returns are accepted within 30 days, and orders dispatch in 1 to 2 business days with tracking.

Who it suits: first-time users, people who want to stay between 5 and 15 mg a day, and anyone who wants to choose the format. Who should look elsewhere: people settled on 12 mg or more a day who want the lowest cost per milligram (#2, #3 or #7), and people who want finished-product certificates (#2). Our first-timer’s guide to methylene blue covers the first two weeks.

2. Nutricel Blue Boost: best finished-lot paperwork

Nutricel’s Blue Boost capsule holds 12 mg of USP grade methylene blue with 35 mg of vitamin C ester and 235 mg of organic cacao powder, 60 capsules for $34.90. That is $0.58 a capsule and $0.24 per 5 mg. Its certificates page links a Eurofins certificate for a finished Blue Boost lot covering methylene blue content, heavy metals and microbes, and says its raw methylene blue is 99.4% pure. The product page suggests one capsule in the morning and notes that evening doses may affect sleep.

The limit is the 12 mg floor, and the cacao adds a second ingredient that single-ingredient buyers may not want. We compare the two brands in our Nutricel vs NooBlue comparison.

Who it suits: buyers settled at about 12 mg a day who want finished-product testing. Who should look elsewhere: anyone who wants to start below 12 mg.

3. Chemist Labs Methylene Blue Capsules: best plain 10 mg capsule

Chemist Labs sells a plain 10 mg capsule: methylene blue, microcrystalline cellulose and a vegetable capsule. It was $24.99 for 60 on Amazon with a $3 coupon, and 4.3 out of 5 from 689 ratings when we checked. That is $0.42 a capsule and $0.21 per 5 mg. The brand’s lab reports page links certificates for three capsule lots. The listing warns against use with SSRIs or during pregnancy or nursing, and notes possible interactions with antihistamines such as diphenhydramine.

Who it suits: buyers who take 10 mg a day and want a simple, cheap capsule. Who should look elsewhere: anyone who wants a first dose below 10 mg. Our methylene blue capsules comparison covers eight capsule brands in more depth.

4. Best 365 Labs NeuroPro+: best pressed tablet

NeuroPro+ from Best 365 Labs, a Utah company, is a swallow-whole tablet with 15 mg of methylene blue and 75 mg of vitamin C per tablet, 60 to a bottle. It costs $49.99 on Amazon, where it showed 4.4 out of 5 from 454 ratings, or $50 on the brand’s store. That is $0.83 a tablet and $0.28 per 5 mg. The brand’s COA page lists a certificate for NeuroPro+ lot 14726, which we did not audit.

The smallest dose is 15 mg, and the brand’s page is softer on antidepressants than we are: it says there “should be no problems” for people on an SSRI at its doses and suggests talking to a provider. We would not combine methylene blue with an SSRI at any dose. Our methylene blue tablets comparison covers the other tablet options.

Who it suits: people who want a real tablet and take 15 mg or more a day. Who should look elsewhere: beginners, and anyone on a serotonergic medicine.

5. Earth Harmony Ultimate Methylene Blue: best capsule with a botanical blend

Earth Harmony’s Ultimate Methylene Blue capsule holds 12 mg of methylene blue with vitamin C and a blend of organic berberine, chlorophyllin and chlorophyll, 60 capsules for $39.95. That is $0.67 a capsule and $0.28 per 5 mg. The page says the methylene blue is “99.99% USP / pharmaceutical grade” and formaldehyde-free, and that the capsules are made in Phoenix, Arizona. It showed 4.6 out of 5 from 35 reviews. The safety notes are clear: not during pregnancy or nursing, check with a provider if you have a G6PD variant, and a warning about its MAO-inhibitor properties.

We did not find a certificate of analysis on the product page to back the 99.99% figure, so ask for one before you rely on it. The berberine blend also makes this more than a methylene blue product.

Who it suits: buyers who want a 12 mg capsule and like the botanical blend. Who should look elsewhere: single-ingredient buyers, and anyone who wants to see a certificate before buying.

6. TrueHealthic Methylene Blue Gummies: best 5 mg gummy

TrueHealthic’s gummies hold 5 mg of USP grade methylene blue each, 30 gummies to a bag, for $29.99 on the brand’s store (it shows a compare-at price of $80). That is $1.00 a gummy and $1.00 per 5 mg, the highest cost per milligram of any gummy here. The page claims 99.9% purity and shows a lab result image. It advises checking with a doctor if you take SSRIs, SNRIs, MAO inhibitors or other serotonergic medicines.

The 5 mg dose is the draw: it is the smallest gummy we found. The page also leans on marketing claims we would not repeat, so read the lab image rather than the headlines. Our TrueHealthic gummies review and NooBlue vs TrueHealthic comparison go into detail.

Who it suits: gummy buyers who want 5 mg a day. Who should look elsewhere: anyone watching cost per milligram.

7. MaxLife Naturals Liposomal Methylene Blue Gummies: lowest cost per milligram

MaxLife Naturals sells a liposomal 12 mg gummy, 60 to a bottle, blue raspberry flavored. It was $24.98 on Amazon when we checked, which works out to $0.42 a gummy and $0.17 per 5 mg, the lowest cost per milligram of the eight brands here.

The ratings are the weak point: 3.5 out of 5 from 41 ratings, and several of the reviews shown on the listing complain about a bitter taste and blue staining of the teeth and tongue. We found no certificate of analysis linked on the listing.

Who it suits: price-first buyers settled at about 12 mg a day. Who should look elsewhere: anyone who wants lab paperwork, a smaller dose or a pleasant taste. Our methylene blue gummies roundup compares eleven gummy brands.

8. LVLUP Health Mito Blue: best all-in-one stack

LVLUP’s Mito Blue is a combination capsule: 10 mg of methylene blue, 400 mg of acetyl L-carnitine, 100 mg of ubiquinol and 10 mg of PQQ per capsule, 60 capsules. It is listed at $89.99, with $80.99 shown for subscribe and save. At the list price that is $1.50 a capsule and $0.75 per 5 mg of methylene blue. The page says every lot goes to a third-party laboratory for purity and potency testing, but we found no certificate linked. It tells people on SSRIs or MAOIs, pregnant or nursing women and anyone under 18 to consult a provider first.

Who it suits: people who wanted those three other nutrients anyway. Who should look elsewhere: anyone who wants to adjust the methylene blue separately from the rest.

OTC methylene blue products we left out, and why

• “Research use only” liquids. Meraki Blu’s product description says “For research purposes only”, even though the store files it as a supplement. Its 30 mL bottle holds 150 mg, which is a 0.5% solution. Our Meraki methylene blue review covers it in full.
• Laboratory chemicals. Some 1% USP solutions are sold by laboratory chemical suppliers rather than supplement brands. Our Biopharm methylene blue review looks at one example. Nutrivance Laboratories’ 20 mg tablet page likewise says it is “Supplied for laboratory, research, and professional use”.
• Aquarium products. Aquarium methylene blue is not for people. Kordon’s 2.303% solution, for example, says it is “not intended for human consumption”.
• Practitioner-only products. Troscriptions Just Blue is no longer sold directly to the public.

If a listing does not say it is a dietary supplement for people, with a stated number of milligrams per serving, do not swallow it.

How to buy methylene blue over the counter safely

1. Check the milligrams per unit. If the label will not tell you, skip it.
2. Buy a supplement, not a chemical. Avoid anything labeled for research, laboratory, aquarium or professional use.
3. Look for the document behind “USP grade”. Every brand here claims it. A lot-numbered certificate from a named laboratory is what makes the claim checkable. Our guide to what 99% and USP purity mean explains what those numbers do and do not tell you.
4. Read what the certificate covers. Identity, methylene blue content, heavy metals and microbes, for a lot that matches the product.
5. Choose the smallest dose you can get. A 5 mg start is easier to adjust than a 12 mg or 15 mg one.
6. Buy from the brand or its official store. On Amazon, check that the seller is the brand.
7. Check your medicines first. Nobody else will when you buy over the counter.

Store it dry, sealed and away from light. Our methylene blue shelf life guide covers how long an opened bottle keeps.

Side effects and who should talk to a doctor first

Blue or blue-green urine is the most common thing people notice, and StatPearls describes it as expected and benign. Liquids and some other brands’ gummies can also stain the mouth for a while. NooBlue gummies don’t leave that blue mouth. Our methylene blue side effects guide covers the rest.

These groups should not take methylene blue, whatever the brand or format:

• People taking serotonergic medicines. Methylene blue is a potent reversible inhibitor of monoamine oxidase A (Ramsay and colleagues, 2007). StatPearls lists serotonin syndrome as a reported reaction when methylene blue is used with SSRIs, SNRIs, MAOIs, certain opioids and dextromethorphan. A systematic review by Ng and Cameron (2010) found 26 patients who became acutely confused after intravenous methylene blue, and 24 of them were taking a serotonin reuptake inhibitor. Do not combine them, and do not stop a prescribed medicine to make room for methylene blue. Talk to your doctor.
• People with G6PD deficiency. StatPearls lists G6PD deficiency as a contraindication because of the risk of hemolysis.
• Pregnancy and breastfeeding. StatPearls notes that methylene blue may cause fetal harm when given during pregnancy. Do not take it while pregnant, and do not take it while breastfeeding without your doctor’s advice.
• Allergy. Anyone who has reacted badly to methylene blue or related thiazine dyes should avoid it.

Keep the dose low. Healthspan, a clinician-led telehealth service, says its dosing typically starts around 5 mg and rises to a maximum of about 25 mg a day. Take it in the morning or early afternoon, and hold a new dose for a week or two before you change it. Our guides to who should not take methylene blue and how many mg of methylene blue to take per day go into more detail.

What the research says about low-dose methylene blue

The human evidence is small. In a 2016 randomized, double-blind, placebo-controlled trial published in Radiology, Rodriguez and colleagues gave 26 healthy adults either placebo or a single oral dose of 280 mg (about 4 mg per kilogram) of USP grade methylene blue. An hour later, functional MRI showed more brain activity during attention and memory tasks, and the methylene blue group gave 7% more correct answers during memory retrieval. In 2023, Singh and colleagues gave healthy volunteers methylene blue into a vein at 0.5 and 1 mg per kilogram and found that brain blood flow and oxygen use fell, the opposite of what they expected.

Most of the rest is cell and animal work on how methylene blue passes electrons along in mitochondria, reviewed by Rojas and colleagues (2012). The effects follow a hormetic curve, rising with dose and then falling, so more is not better (Bruchey and Gonzalez-Lima, 2008). We know of no trial that has tested daily 5 to 25 mg supplement use over months. Treat any OTC methylene blue as a supplement that may support cellular energy, not as something proven to change how you think. Our best methylene blue supplements guide and top methylene blue brands comparison cover the wider market.

Frequently asked questions about OTC methylene blue

Is methylene blue available over the counter?

Yes, as a dietary supplement. Capsules, gummies, tablets and drops are sold online and on Amazon without a prescription. The injectable hospital medicine and compounded pharmacy capsules still need a prescription.

What is the best over-the-counter methylene blue supplement?

Our pick is NooBlue, which sells 5 mg capsules (60 for $37.99), 10 mg gummies with vitamin C (60 for $49.99) and a 1% solution at 0.5 mg per drop ($29.99 for 50 mL). NooBlue makes them. Start with the 5 mg capsules if you are new to methylene blue.

Do I need a prescription for methylene blue?

Not for supplements. You do for the injectable hospital form, for compounded capsules from a pharmacy, and for telehealth programs that prescribe it after a clinician review.

Is OTC methylene blue the same as the hospital version?

The molecule is the same. The route and dose differ: hospital methylene blue is injected at doses set by a clinician, while supplements provide a few milligrams by mouth. Both should be USP grade.

Which form of OTC methylene blue is best?

Capsules suit people who want a fixed dose and no taste. Gummies suit people who dislike pills. Drops give the finest control and the lowest cost per milligram, but need measuring and can stain the mouth. Tablets are rare. Choose the form with the smallest starting dose you can get.

Is over-the-counter methylene blue safe?

For healthy adults on no interacting medicines, low doses are generally well tolerated, but no long-term trial has tested daily use. Do not take it if you take SSRIs, SNRIs, MAOIs, certain opioids or dextromethorphan, if you have G6PD deficiency, or if you are pregnant or breastfeeding. Talk to your doctor if you take any prescription medicine.

How much OTC methylene blue should I take?

Start at the lowest dose your product allows, ideally 5 mg, once a day with food, and hold it for one to two weeks. One clinician-led service starts around 5 mg and goes up to a maximum of about 25 mg a day.

Are methylene blue supplements on Amazon legit?

Some are, some are not. Check that the seller is the brand, that the label states milligrams per unit, and that the brand publishes a certificate of analysis. Avoid listings labeled for research, laboratory or aquarium use.

How can I tell if OTC methylene blue is USP grade?

Look for a lot-numbered certificate of analysis from a named laboratory that covers identity, methylene blue content, heavy metals and microbes. A USP claim on the label without a document behind it tells you little.

Why does methylene blue turn urine blue?

The dye leaves the body in urine, so urine turns blue or blue-green. StatPearls describes this as expected and benign.

The verdict: which OTC methylene blue should you buy?

For most people buying without a prescription, NooBlue is the right choice. Start with the 5 mg capsules at $37.99 for 60, move to the 10 mg gummies if you prefer to chew, or use the 1% drops if you want fine control at $0.30 per 5 mg. All three use USP grade methylene blue, and the ingredient report is on the product pages.

If finished-product certificates matter most, Nutricel Blue Boost is $34.90 for 60 capsules of 12 mg. If you want a plain 10 mg capsule, Chemist Labs was $24.99 on Amazon with three lot certificates on its site. If you want a tablet, Best 365 Labs NeuroPro+ is 15 mg per tablet. If cost per milligram is all that matters, MaxLife’s 12 mg gummy works out at $0.17 per 5 mg, with mixed reviews and no linked certificate.

Whatever you buy, avoid anything not sold as a supplement for people, check your medicines first, and start at the lowest dose the product allows.

More methylene blue buying guides

• Best methylene blue supplements in every format
• Best methylene blue capsules compared
• Best methylene blue gummies
• Best methylene blue tablets
• Methylene blue gummies vs capsules

Browse every guide on the NooBlue blog or in our buying guides, see all three formats in the NooBlue shop, or go back to the NooBlue home page.

Sources

1. Ostrovsky A, Afzal M. Methylene Blue. StatPearls, updated January 2, 2026. NCBI Bookshelf NBK557593
2. 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
3. Ng BK, Cameron AJ. The role of methylene blue in serotonin syndrome: a systematic review. Psychosomatics. 2010;51(3):194-200. PubMed 20484716
4. 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 · full text (dose)
5. Singh N, MacNicol E, DiPasquale O, et al. The effects of acute methylene blue administration on cerebral blood flow and metabolism in humans and rats. Journal of Cerebral Blood Flow & Metabolism. 2023;43(2 suppl):95-105. PubMed 36803299
6. Rojas JC, Bruchey AK, Gonzalez-Lima F. Neurometabolic mechanisms for memory enhancement and neuroprotection of methylene blue. Progress in Neurobiology. 2012;96(1):32-45. PubMed 22067440
7. Bruchey AK, Gonzalez-Lima F. Behavioral, physiological and biochemical hormetic responses to the autoxidizable dye methylene blue. American Journal of Pharmacology and Toxicology. 2008;3(1):72-79. PubMed 20463863
8. Product pages read September 25, 2026: NooBlue capsules · NooBlue gummies · NooBlue drops · Nutricel Blue Boost and Nutricel certificates · Chemist Labs on Amazon and lab reports · Best 365 Labs NeuroPro+ on Amazon, brand page and COA page · Earth Harmony · TrueHealthic gummies · MaxLife Naturals on Amazon · LVLUP Mito Blue · Meraki Blu · Nutrivance Laboratories · Troscriptions Just Blue · Kordon Methylene Blue