Is methylene blue profitable to sell on Amazon United States?

The niche generates $8.5M/yr across 33 tracked products. 20 of 20 products launched in the last 360 days are still selling. 90-day search growth is -31.9%. Flapen's verdict: Worth a look (72/100).

How competitive is the methylene blue niche?

27 brands and 49 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 53% of demand.

What do buyers complain about in methylene blue?

Top complaints mined from reviews: Functionality-Overall, Color, Quality-Overall. The return rate is 0.3%.

When does demand for methylene blue peak?

Demand peaks in Feb–Mar–Apr; the busiest month runs 3.4× the quietest.

What does it cost to enter the methylene blue niche?

Listings span $7.23–$54.88; the average listing price is $22.89 (sweet spot $15–$100). The average incumbent carries 649 reviews — the moat a new listing must climb.

Methylene Blue

Worth a look

Shows a $8.5M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size

Incredible$8.5M

$8.5M/yr · 4.4M searches

Returns

Incredible0.3%

return rate — above 5% kills the launch gate

Avg price

Incredible$22.89

avg listing price — sweet spot $15–$100

Brand share

Great53%

top-5 brand share — no brand owns this niche

Price range

Great$7.23–$54.88

cheapest to priciest tracked listing — scored on the share inside $15–$100

Conversion

Great8.5%

search→purchase rate — share of searches ending in a sale

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Review moat

Good649.24

avg incumbent reviews — the moat a new listing must climb

Competition

Good48%

top-5 click share — leaders hold, buyers still browse

Growth

Bad-31.9%

90-day search growth — must beat 0% to launch

Signals No Dominant Brand

Is methylene blue profitable on Amazon?

According to Flapen's Amazon United States niche tracking, methylene blue is a $8.5M/yr Amazon United States market (4.4M searches/yr). The top 5 brands hold 53% of demand. Demand peaks in Feb–Mar–Apr. Verdict: Worth a look — 72/100.

Data updated Jul 25, 2026 · scored weekly · How we score niches

methylene blue market size & sales

Units sold, revenue, conversion and listing quality across the tracked shelf.

Units sold / yr: 300K–400K; avg 6,000–8,000/product
Revenue / yr: $6.9M–$9.2M; units × avg price
Conversion rate: 8.5%
Avg BSR: #787
Page quality: 0%
Prime: 100%
Sponsored: 91%
Out of stock: 9.1%
Avg brand age: 27 months
Avg seller age: 169 days

Competition: brands, sellers & click share

The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.

Brands

27 rising

Sellers

Top-5 brand share

53%

Top 20: 94%

Top-5 click share

48%

Top 20: 87%

Open market

42%

Bluesun17%
Sweat & Soul11%
Lunakai9%
Meraki Medicinal9%
Earth Harmony Naturals7%
CDE5%

methylene blue demand & seasonality

Weekly Amazon search volume, last 104 weeks — -31.9% search growth over the last 90 days.

Peak months: Feb, Mar, Apr · busiest ÷ quietest = 3.4×

Open Trend

Top methylene blue search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

methylene blue3.0M/yr -35.3%7.1% conv.
methylene blue pharmaceutical grade349K/yr -43.3%5.1% conv.
methylene blue drops104K/yr -5.8%3.6% conv.
methylene blue for humans80K/yr +114.3%0.6% conv.
blue methylene91K/yr -0.2%2.2% conv.
azul de metileno para humanos94K/yr -10.5%2.6% conv.
methane blue for humans71K/yr -30.1%1.9% conv.
meraki methylene blue88K/yr -20.7%11.3% conv.
methylene-blue66K/yr -35.2%2.1% conv.
pharmaceutical grade methylene blue58K/yr -35.1%1.6% conv.

All search terms

Top methylene blue products & what they sell for

Every tracked product — its share of the shelf, its review moat, and what it sells for.

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Bluesun Methylene Blue Drops 1% Pharmaceutical Grade - Made in USA Formaldehyde-Free Third-Party Tested USP Purity 99.99% GMO-Free Alcohol-Free - 2 Fl Oz (60mL) in Amber Glass 10mg/mL

Bluesun$10.544.2★2,271 rev

Sweat & Soul Methylene Blue Pharmaceutical Grade 2oz - Made in USA - Balanced Electrolytic 1% Solution - USP Grade No Formaldehyde No Alcohol 3rd Party Tested

Sweat & Soul$29.254.4★1,332 rev

Meraki Blu USP Grade Methylene Blue Solution Third-Party Tested 1% Liquid Formula High Purity Blue Formula 30ml Glass Dropper Bottle

Meraki Medicinal$33.824.3★823 rev

Lunakai USA Made Methylene Blue Pharmaceutical Grade 99.99% Pure USP Grade 1% Methylene Blue Drops

Lunakai$22.144.5★477 rev

CDE Methylene Blue Capsules 30mg - Made in USA 90 Days Supply - Pharmaceutical CDEMBC USP Grade Third Party Lab Tested Formaldehyde-Free Non-GMO - Cellular & Cognitive Support

CDE$18.654.4★168 rev

Newest

by launch date

Methylene Blue Gummies 60 Count - 5mg of Methylene Blue Per Gummy 99.9% Pure - Supports Cognitive Function Mental Focus & Cellular Energy - Antioxidant Support Vegan Non GMO

VEGONAUD$31.5361 rev

2mo ago

CDE Methylene Blue Capsules 30mg - Made in USA 90 Days Supply - Pharmaceutical CDEMBC USP Grade Third Party Lab Tested Formaldehyde-Free Non-GMO - Cellular & Cognitive Support

CDE$18.65168 rev

3mo ago

Methylene Blue Gummies 60 Count 5mg Per Gummy 99.9% Pure Methylene Blue Supplement Supports Cognitive Function Mental Focus & Cellular Energy Antioxidant Support Vegan Non-GMO Daily Supplement

Echoes of the spring$32.83102 rev

4mo ago

3% Methylene Blue Drops High Purity USP Pharmaceutical Grade Blue Methylene Liquid for Humans Cognitive & Focus Support No Alcohol No Formaldehyde 120 mL 4.06 FL OZ

Someraze$22.24139 rev

4mo ago

HEALTHLETIC Methylene Blue Drops - USP Pharmaceutical Grade 1% Solution Made in USA - Supports Mental Clarity Focus & Cellular Energy - 3rd Party Tested with COA - No Formaldehyde (30ml / 1.1 fl.oz)

HEALTHLETIC$15.0562 rev

5mo ago

What reviews say buyers love and hate about methylene blue

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall26%

“quality seems solid”

Ease Of Use9%

“Easy to Take”

Value For Money7%

“Decent price”

Focus Enhancement7%

“I was able to focus”

Energy Level6%

“Lots of energy”

Advertised Vs Actual Product5%

“exactly as advertised”

Efficiency4%

“Worked well”

Color4%

“Amazing Blue”

Taste-Overall3%

“no strange taste”

Strength3%

“the container feels sturdy”

What buyers complain about

Functionality-Overall10%

“not good result”

Color10%

“I only dont like the color”

Quality-Overall6%

“Low quality”

Value For Money6%

“Not worth it”

Taste-Overall5%

“Hate the taste”

Advertised Vs Actual Product5%

“Not as advertised”

Side Effects5%

“made me sick”

Stain Resistance5%

“this stuff stains”

Dosage4%

“To high of dose to be sold”

Ease Of Use2%

“its very hard to use”

Top return reasons

Leak-Proof21%

Advertised Vs Actual Product15%

Functionality-Overall14%

Defective Material/Parts7%

Stain Resistance7%

Value For Money5%

Certifications5%

Color5%

Instructions/User Manual/Troubleshooting4%

Size-Overall3%

Common methylene blue questions

Is methylene blue profitable to sell on Amazon United States?: The niche generates $8.5M/yr across 33 tracked products. 20 of 20 products launched in the last 360 days are still selling. 90-day search growth is -31.9%. Flapen's verdict: Worth a look (72/100).
How competitive is the methylene blue niche?: 27 brands and 49 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 53% of demand.
What do buyers complain about in methylene blue?: Top complaints mined from reviews: Functionality-Overall, Color, Quality-Overall. The return rate is 0.3%.
When does demand for methylene blue peak?: Demand peaks in Feb–Mar–Apr; the busiest month runs 3.4× the quietest.
What does it cost to enter the methylene blue niche?: Listings span $7.23–$54.88; the average listing price is $22.89 (sweet spot $15–$100). The average incumbent carries 649 reviews — the moat a new listing must climb.