Is methylene blue profitable to sell on Amazon United Kingdom?

The niche generates £271K/yr across 9 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -37.1%. Flapen's verdict: Skip it (46/100).

How competitive is the methylene blue niche?

9 brands and 77 sellers compete. The top 5 products take 84% of clicks and top 5 brands hold 84% of demand.

What do buyers complain about in methylene blue?

Top complaints mined from reviews: Leak-Proof, Certifications, Color. The return rate is 0.7%.

When does demand for methylene blue peak?

Demand peaks in Jan–Feb–Mar; the busiest month runs 3.0× the quietest.

What does it cost to enter the methylene blue niche?

Listings span £8.17–£49.63; the average listing price is £24.24 (sweet spot $15–$100). The average incumbent carries 502 reviews — the moat a new listing must climb.

methylene blue

Skip it

Soft demand (-37.1% this quarter) — this niche doesn't clear our bar today.

Returns

Incredible0.7%

return rate — above 5% kills the launch gate

Avg price

Incredible£24.24

avg listing price — sweet spot $15–$100

Price range

Great£8.17–£49.63

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

Review moat

Good501.67

avg incumbent reviews — the moat a new listing must climb

Market size

Okay£271K

£271K/yr · 300K searches

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Conversion

Okay3.7%

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

Brand share

Okay84%

top-5 brand share — brands hold most of the demand

Competition

Bad84%

top-5 click share — a locked-up shelf

Growth

Bad-37.1%

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

Signals Low Review Barrier Out of Stock

According to Flapen's Amazon United Kingdom niche tracking, methylene blue is a £271K/yr Amazon United Kingdom market (300K searches/yr). The top 5 brands hold 84% of demand. Demand peaks in Jan–Feb–Mar. Verdict: Skip it — 46/100.

Data updated Jul 21, 2026 · scored weekly · How we score niches

methylene blue market data

Units sold / yr: 10K–13K; avg 500–750/product
Revenue / yr: £242K–£303K; units × avg price
Conversion rate: 3.7%
Avg BSR: #19,861
Page quality: 0%
Prime: 67%
Sponsored: 67%
Out of stock: 52.9%
Avg brand age: 43 months
Avg seller age: 183 days

Competition & brand share

The top 5 products capture 84% of clicks — a locked-up shelf that new listings rarely crack.

Brands

9 rising

Sellers

Top-5 brand share

84%

Top 20: 100%

Top-5 click share

84%

Top 20: 100%

Open market

11%

LUMIN LIFE34%
NT Labs19%
7 Labs14%
CZTL9%
AzulBotanicals7%
Kordon6%
Open — no brand owns it (3 brands, 11%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -37.1% search growth over the last 90 days.

Peak months: Jan, Feb, Mar · busiest ÷ quietest = 3.0×

Open Trend

Top methylene blue search terms

methylene blue236K/yr -35.3%0.8% conv.
methylene blue for humans32K/yr -41.8%0.5% conv.
methylene10K/yr -41.5%0.2% conv.
methylene blue capsules10K/yr -22.1%0.1% conv.
blue methylene5K/yr -61.0%1.8% conv.
methylene blue pharmaceutical grade5K/yr -74.5%0.5% conv.
methylene blue tablets2K/yr -27.5%0.4% conv.

All search terms

Top methylene blue products on Amazon

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

Top sellers

by 90-day click share

5% Methylene blue Aqueous Solution Methylthioninium Chloride 120ml Glass bottle with pipette for Research & Analytical Use

LUMIN LIFE£25.105.0★8 rev

NT Labs Aquarium Methylene Blue Fish Medicine (100ml Treats 900L)

NT Labs£8.174.6★244 rev

Methylene Blue 2% Solution - Pharmaceutical USP Grade Purity 99.99% No Formaldehyde Formula with Child Resistant Dropper - 50 mL (1.7 fl. oz.)

7 Labs£24.914.2★31 rev

CZTL Methylene Blue Powder - 1g

CZTL£24.894.5★69 rev

Methylene Blue Infused Whipped Grass Fed Beef Tallow Balm Anti-Aging Moisturizer Stretchmarks Rosacea Psoriasis Eczema Acne All skin types (1.7 oz)

AzulBotanicals£18.914.2★171 rev

Newest

by launch date

Methylene Blue 2% Solution - Pharmaceutical USP Grade Purity 99.99% No Formaldehyde Formula with Child Resistant Dropper - 50 mL (1.7 fl. oz.)

7 Labs£24.9131 rev

2mo ago

5% Methylene blue Aqueous Solution Methylthioninium Chloride 120ml Glass bottle with pipette for Research & Analytical Use

LUMIN LIFE£25.108 rev

2mo ago

Methylene Blue

BACTERIOSTATIC£49.63106 rev

1y ago

NT Labs Aquarium Methylene Blue Fish Medicine (100ml Treats 900L)

NT Labs£8.17244 rev

1y ago

Methylene Blue Infused Whipped Grass Fed Beef Tallow Balm Anti-Aging Moisturizer Stretchmarks Rosacea Psoriasis Eczema Acne All skin types (1.7 oz)

AzulBotanicals£18.91171 rev

2y ago

What buyers say about methylene blue

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

What buyers love

Quality-Overall26%

“Good quality & always delivers on time”

Advertised Vs Actual Product18%

“Does what it says”

Ease Of Use14%

“Very easy to use”

Value For Money12%

“Good value for money”

Efficiency6%

“It works well for me”

Leak-Proof4%

“not leaky”

Safety Standards3%

“The cap is well secured”

Color3%

“characteristic blue colour that indicates proper concentration”

Instructions/User Manual/Troubleshooting2%

“Came with a batch test certificate and full instructions and pepite”

Allergies2%

“Very good for skin irritaions”

What buyers complain about

Leak-Proof15%

“One drop and it's useless”

Certifications12%

“there isnt a huge amount of transparent third-party testing information easily available”

Color10%

“It does turn whatever you add it too blue”

Stain Resistance9%

“The first this I will say is this stuff can stain so be very careful using it”

Value For Money8%

“which seemed very expensive”

Ease Of Use8%

“Do not use”

Absorbency8%

“as can lead to over absorption through skin”

Ease Of Cleaning3%

“which can be incredibly messy”

Advertised Vs Actual Product2%

“While this is labelled as a 2% solution and claims high purity, there isnt a huge amount of transparent third-party testing information easily available, which did make me pause a little”

Top return reasons

Leak-Proof68%

Compatibility-Overall9%

Functionality-Overall6%

Strength3%

Value For Money3%

Adhesion/Stickiness3%

Certifications3%

Advertised Vs Actual Product3%

Color2%

Common questions

Is methylene blue profitable to sell on Amazon United Kingdom?: The niche generates £271K/yr across 9 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -37.1%. Flapen's verdict: Skip it (46/100).
How competitive is the methylene blue niche?: 9 brands and 77 sellers compete. The top 5 products take 84% of clicks and top 5 brands hold 84% of demand.
What do buyers complain about in methylene blue?: Top complaints mined from reviews: Leak-Proof, Certifications, Color. The return rate is 0.7%.
When does demand for methylene blue peak?: Demand peaks in Jan–Feb–Mar; the busiest month runs 3.0× the quietest.
What does it cost to enter the methylene blue niche?: Listings span £8.17–£49.63; the average listing price is £24.24 (sweet spot $15–$100). The average incumbent carries 502 reviews — the moat a new listing must climb.