Is undecylenic acid toenail fungus treatment profitable to sell on Amazon United States?

The niche generates $487K/yr across 21 tracked products. 8 of 9 products launched in the last 360 days are still selling. 90-day search growth is +9.1%. Flapen's verdict: Worth a look (65/100).

How competitive is the undecylenic acid toenail fungus treatment niche?

17 brands and 29 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 62% of demand.

What do buyers complain about in undecylenic acid toenail fungus treatment?

Top complaints mined from reviews: Functionality-Overall, Symptom Reduction, Value For Money. The return rate is 0.4%.

When does demand for undecylenic acid toenail fungus treatment peak?

Demand peaks in Mar–Apr–May–Jul; the busiest month runs 2.6× the quietest.

What does it cost to enter the undecylenic acid toenail fungus treatment niche?

Listings span $9.50–$45.96; the average listing price is $23.01 (sweet spot $15–$100). The average incumbent carries 3,012 reviews — the moat a new listing must climb.

undecylenic acid toenail fungus treatment

Worth a look

Shows low returns (0.4%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Incredible0.4%

return rate — above 5% kills the launch gate

Avg price

Incredible$23.01

avg listing price — sweet spot $15–$100

Conversion

Great10.0%

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

Price range

Great$9.50–$45.96

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

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Brand share

Good62%

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

Market size

Good$487K

$487K/yr · 212K searches

Competition

Okay59%

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

Growth

Okay+9.1%

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

Review moat

Okay3,012.33

avg incumbent reviews — the moat a new listing must climb

According to Flapen's Amazon United States niche tracking, undecylenic acid toenail fungus treatment is a $487K/yr Amazon United States market (212K searches/yr). The top 5 brands hold 62% of demand. Demand peaks in Mar–Apr–May–Jul. Verdict: Worth a look — 65/100.

Data updated Jul 18, 2026 · scored weekly · How we score niches

undecylenic acid toenail fungus treatment market data

Units sold / yr: 20K–25K; avg 750–1,000/product
Revenue / yr: $460K–$575K; units × avg price
Conversion rate: 10.0%
Avg BSR: #279
Page quality: 0%
Prime: 100%
Sponsored: 95%
Out of stock: 8.3%
Avg brand age: 50 months
Avg seller age: 160 days

Competition & brand share

The top 5 products take 59% of clicks — established leaders, but buyers still shop beyond them.

Brands

17 rising

Sellers

Top-5 brand share

62%

Top 20: 95%

Top-5 click share

59%

Top 20: 99%

Open market

32%

Tobcharm27%
THORNE13%
MEOLY11%
VTROUY6%
FOOT CURE6%
--5%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +9.1% search growth over the last 90 days.

Peak months: Mar, Apr, May, Jul · busiest ÷ quietest = 2.6×

Open Trend

Top undecylenic acid toenail fungus treatment search terms

undecylenic acid93K/yr -0.4%7.9% conv.
undecylenic acid 25%32K/yr +27.6%9.2% conv.
undecylenic acid toenail fungus treatment28K/yr -2.1%9.4% conv.
25% undecylenic acid12K/yr +29.5%8.5% conv.
acido undecilenico para uas4K/yr +802.2%3.0% conv.
undecylenic acid nail fungus5K/yr +12.5%5.8% conv.
pure undecylenic acid5K/yr -10.1%3.8% conv.
undecylenic4K/yr +68.6%5.0% conv.
thorne undecylenic acid6K/yr -21.2%19.4% conv.
fungavir5K/yr -36.9%4.6% conv.

All search terms

Top undecylenic acid toenail fungus treatment 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 21 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Toenail Fungus Treatment with 25% Undecylenic Acid Toe Fungus Treatment for Toenail Fungus Nail Treatment Toenail Fungus Treatment Extra Strength Fungal Nail Treatment for Athletes Foot - 2pcs

Tobcharm$13.784.1★1,680 rev

THORNE - Undecylenic Acid - Fatty Acid Support for a Healthy Balance of Gut & Vaginal Flora - Promotes Optimal GI Tract Function* - Gluten Dairy & Soy-Free - 250 Softgels

THORNE$45.964.4★1,794 rev

MEOLY Toenail Fungus Treatment Extra Strength: 30% Undecylenic Acid Toenail Fungus Treatment With natural oils -nail bandage Toenail file & brush 30 ml

MEOLY$19.104.2★64 rev

Toenail Fungus Treatment Extra Strength VTROUY 2 Bottle Nail & Toe Solution with Undecylenic Acid 25% and Tea Tree Oil 15ml 2Pcs

VTROUY$17.614.5★487 rev

Better Nail - Rejuvica - Extra Strength Nail Fungus Treatment - 25% Undecylenic Acid Maximum Strength Antifungal Solution helps Discolored & Damaged Nails - Supports Healthy Nails with 6 Natural Oils

--$34.423.9★13,353 rev

Newest

by launch date

Extra Strength Nail Care Solution: Natural Formula Complete Nail Restoration Kit with Nail File for Thick Discolored & Brittle Nails

PHARMBANNER$22.24273 rev

2mo ago

MEOLY Toenail Fungus Treatment Extra Strength: 30% Undecylenic Acid Toenail Fungus Treatment With natural oils -nail bandage Toenail file & brush 30 ml

MEOLY$19.1064 rev

3mo ago

Toenail Fungus Treatment : Extra Strength 25% Undecylenic Acid Toe and Fingernail Fungus Removal - Fast Acting Fungal Nail Revitalizer with Tea Tree Oil (0.5 Fl Oz (Pack of 2))

UAUKO$18.9877 rev

5mo ago

Toenail Fungus Treatment Extra Strength VTROUY 2 Bottle Nail & Toe Solution with Undecylenic Acid 25% and Tea Tree Oil 15ml 2Pcs

VTROUY$17.61487 rev

6mo ago

Arflom Toenail Fungus Treatment Kit: 2 Pcs Extra Strength 25% Undecylenic Acid Solution & 14 Fungal Nail Renewal Patches - for Toe Nail & Fingernail with Tea Tree Oil (0.51 Fl Oz (Pack of 2))

ARFLOM$18.3123 rev

7mo ago

What buyers say about undecylenic acid toenail fungus treatment

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

What buyers love

Efficiency21%

“it works”

Quality-Overall18%

“Great product, and def”

Ease Of Application10%

“EASY TO APPLY”

Ease Of Use9%

“Good size easy to handle”

Value For Money7%

“Excellent value”

Advertised Vs Actual Product7%

“As advertised”

Symptom Reduction4%

“The results were truly noticeable”

Smell3%

“doesn't smell terrible”

Color Fading/Discoloration2%

“less discoloration”

Instructions/User Manual/Troubleshooting2%

“It has clear instructions”

What buyers complain about

Functionality-Overall39%

“Did Not Work”

Symptom Reduction9%

“have seen ABSOLUTELY NO IMPROVEMENT WHATSOEVER”

Value For Money7%

“very expensive”

Leak-Proof3%

“leaked throughout the box”

Color3%

“It starts to change color to light pink”

Color Fading/Discoloration2%

“now nails are thick and discolored”

Durability2%

“Brush broken at 2nd use”

Smell2%

“It has a weird chemical smell”

Advertised Vs Actual Product2%

“FALSE ADVERTISING”

Quality-Overall2%

“Not as good as expected”

Top return reasons

Leak-Proof30%

Functionality-Overall29%

Advertised Vs Actual Product9%

Defective Material/Parts4%

Smell3%

Dispensing Mechanism3%

Ingredients-Overall2%

Value For Money2%

Moist/Dry2%

Size-Overall2%

Common questions

Is undecylenic acid toenail fungus treatment profitable to sell on Amazon United States?: The niche generates $487K/yr across 21 tracked products. 8 of 9 products launched in the last 360 days are still selling. 90-day search growth is +9.1%. Flapen's verdict: Worth a look (65/100).
How competitive is the undecylenic acid toenail fungus treatment niche?: 17 brands and 29 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 62% of demand.
What do buyers complain about in undecylenic acid toenail fungus treatment?: Top complaints mined from reviews: Functionality-Overall, Symptom Reduction, Value For Money. The return rate is 0.4%.
When does demand for undecylenic acid toenail fungus treatment peak?: Demand peaks in Mar–Apr–May–Jul; the busiest month runs 2.6× the quietest.
What does it cost to enter the undecylenic acid toenail fungus treatment niche?: Listings span $9.50–$45.96; the average listing price is $23.01 (sweet spot $15–$100). The average incumbent carries 3,012 reviews — the moat a new listing must climb.