Nootlyn Methylene Blue: What Our Lab Test and Amazon's Records Show

Nootlyn sells methylene blue capsules and liquid drops on Amazon. In Nutricel's independent testing, the capsules failed both the water test and the lab assay: 5.45 mg of methylene blue per capsule against a 15 mg label claim, about a third of what the label says. Per Nutricel's filed Amazon Brand Registry reports, both Nootlyn listings also carry documented fake-review, listing-violation, duplicate-listing, and FDA-labeling flags. Current verdict in Nutricel's lab-test database for both products: Avoid.

• Failed both tests. The capsules (ASIN B0GSG2XTBM) produced a medium blue water test, not a deep blue, and the lab detected 5.45 mg against 15 mg claimed.
• The drops are untested. Nootlyn Liquid Methylene Blue Drops 5% (ASIN B0G43VKJ2F) has not been tested, so the 5% claim is unconfirmed.
• No verifiable company behind it. Nutricel found no independent website, About page, address, or named manufacturer for Nootlyn.

Disclosure: Nutricel sells methylene blue and runs this database, so we are not a neutral party. The result applies to the sample we tested. If Nootlyn has independent lab documentation, send it to us and we will review it and update the entry.

Important: Methylene blue has documented interactions with serotonergic medications including SSRIs and MAOIs. Review the full adverse medications list before use, regardless of brand.

Nootlyn is a methylene blue brand sold on Amazon. It offers a capsule product and a liquid drops product, listed under the names Nootlyn Methylene Blue Capsules and Nootlyn Liquid Methylene Blue Drops 5%.

What Nutricel could not find is anything outside Amazon. Nootlyn has no independent company website, and there is no About page, physical address, working contact information, or named manufacturer to verify. Only the brand name NOOTLYN appears on the listings, with no way to confirm who makes or sells the product. Both listings are rated Poor for brand credibility and Poor for Amazon seller credibility in Nutricel's database.

Per Nutricel's filed Amazon Brand Registry reports, both Nootlyn listings carry documented flags. Notes on file also describe a duplicate listing that had been live for over a month, offering the identical product (same form, same dosage, same size) as an existing listing, with packaging photos that show no brand identity or product name.

These are marketplace-integrity findings about the listings. They are separate from what is in the bottle, which is why the water and lab tests below matter.

These terms get used loosely online, so here is what each one specifically covers on Amazon:

• Fake reviews. Reviews that violate Amazon's Community Guidelines, including undisclosed incentivized reviews, reviews from accounts with no purchase history, or coordinated review activity designed to inflate a rating.
• Listing violation. A catch-all for how a product is represented on its detail page, such as missing brand identity, misleading claims, or content that does not match what is sold.
• Duplicate listing. The same product, in the same form, dosage, and size, listed a second time under a separate listing.
• FDA labeling noncompliance. Marketing or label language that crosses into disease claims a dietary supplement cannot make, or that omits information a supplement label requires.

None of these, on its own, measures what is in the bottle. That is what the test results measure.

Nutricel's database uses two independent checks. A water test dissolves the product and checks for the deep blue color genuine methylene blue produces. A lab test sends the product to a third-party lab to measure the actual milligram content against the label.

Nootlyn capsules failed both. The water test showed a medium blue color rather than a deep, vivid blue. The lab assay then detected 5.45 mg per capsule against the 15 mg on the label, roughly 36 percent of the claim. In plain terms, a buyer taking one capsule would get about a third of the dose printed on the bottle.

Nootlyn Liquid Drops 5% has not been tested. Its claimed 5 percent concentration is five times a standard 1 percent solution, so each drop would deliver five times as much methylene blue if the claim were accurate. Until it is tested, treat the label as unconfirmed.

For comparison, every Nutricel product in the database has passed both the water test and an independent lab assay, and Blue Boost measured 12.83 mg against its 12 mg claim. Nutricel commissioned that testing itself, so check it against the third-party lab reports on our lab reports page.

You do not need access to Brand Registry data to do a basic gut check on any supplement listing before you buy. A few signals worth checking:

• A review burst. Sort by most recent and check whether a large cluster of five-star reviews landed within the same few days or weeks, rather than spreading naturally over the listing's lifetime.
• Repeated phrasing. Several reviews using near-identical language or structure is a common sign of incentivized or coordinated reviews.
• Low Verified Purchase share. Compare how many reviews carry Amazon's Verified Purchase badge against the total count. A large gap is worth noticing.
• No photos, no specifics. Genuine long-term users of a supplement tend to mention dose, timing, or how they use a product. A wall of generic praise with no photos or detail is a weaker signal of real use.

No single signal proves manipulation on its own. But several of these showing up together on one listing is a reasonable prompt to go check that brand's independent testing status, using the database below, before you buy.

Nutricel's full lab and water test database covers more than 160 methylene blue products and lets you search by brand name, filter by product type or seller country, and see the current verdict, along with water test result, lab test result, and claimed dose, for each one. Before you buy or reorder any methylene blue product, including Nootlyn or any brand mentioned here, search for it by name and check its current verdict, since testing and Amazon listing status can change over time.

Do not take methylene blue, from any brand, if you are currently using:

• SSRIs or MAOIs (risk of serotonin syndrome)
• Any serotonergic medication

Review the full adverse medications list and consult your healthcare provider before starting methylene blue in any form.

Every Nutricel product uses USP-grade methylene blue, is manufactured in an NSF-certified, FDA-registered facility in the United States, and is tested by independent third-party labs. The difference between them is what they are built to support alongside the methylene blue itself.

Blue Boost is Nutricel's core formula. If your focus is methylene blue itself and you want a clean, research-backed capsule built around absorption and cellular energy, this is it.

Blue Immune combines methylene blue with copper, NAC, grass-fed beef liver, and vitamins A, C, and E for cellular and immune function support.

Blue Shroom pairs methylene blue with six organic mushroom extracts including lion's mane, reishi, cordyceps, chaga, shiitake, and turkey tail.

Blue Renew is built around GlyNAC (glycine and N-acetyl cysteine), studied for supporting glutathione levels and brain function in aging populations.

Blue Remove combines zeolite, curcumin, and nattokinase for cellular detox, circulatory, and inflammation support.

Blue Liquid delivers USP-grade methylene blue in a precise dropper bottle for those who prefer liquid format and flexible dosing.

• Nutricel. Methylene Blue Lab and Water Test Database, Nootlyn entries. Methodology and per-product results. Nutricel runs this database and sells methylene blue.
• Amazon. Amazon Brand Registry. The program brand owners use to report suspected listing violations and regulatory compliance concerns.
• U.S. Food and Drug Administration. Drug Safety Communication: methylene blue and serotonergic drugs (archived).

Sam Carlson, Marketing Developer at Nutricel

Sam is a marketing developer at Nutricel who writes the Nutricel Insights series to help our customers understand methylene blue and make informed choices. Every figure in this piece comes directly from Nutricel's public lab test database and its underlying Amazon Brand Registry reports, linked in the references above. Sam is not a medical professional, and this article is intended as education rather than medical advice. Always speak with your healthcare provider before starting any supplement.