Japanese Knotweed
MaybeAn estimated 0.0% of orders come back. But the products selling today already average 4.6★, so Japanese Knotweed is a Maybe.
- Flapen Score
- 58 / 100Top 16% of 14,768 Health & Household niches · +9 vs the category median of 4958
- Market size
- $118K/yr60K searches / yr
- 90-day growth
- +24.3%search demand this quarter
- Competition
- 56%top-5 click share · 17 brands · 469 sellers
Flapen Score
Japanese Knotweed against its category
The dotted line is the Health & Household average. Past it, Japanese Knotweed is stronger. Inside it, weaker.
Market
The Japanese Knotweed market on Amazon at a glance
Shoppers on Amazon United States searched for Japanese Knotweed 60K times last year and spent an estimated $118K. The top 5 brands take 72% of clicks. Demand peaks in May–Jun. Flapen scores it 58 out of 100, a Maybe.
01 · Demand
An estimated 7.0% of those searches ended in a purchase.
Shoppers searched for this 60K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 7.0% of those searches ended in a purchase. Searches in the last 90 days moved +24.3% against the 90 days before. Searches, conversion and average price together put the market at an estimated $118K a year.
- Searches, last 12 months
- 60K
- Growth, 90 days vs prior 90
- +24.3%
- Conversion, latest week
- 7.0%
- Market size, estimated
- $118Ka year
- Peak month
- May1.6× the quietest month
- Top search term
- japanese knotweed45K searches a year
02 · Price
A sale here is worth $28.03.
Listings sell for $28.03 on average, from $10.16 to $45.00. Amazon reports units sold in ranges. This niche sold 4K to 5K a year. The average listing sells 100 to 250 of them. At $28.03 that is $3K to $7K a year per listing.
- Average price
- $28.03inside the $15 to $100 sweet spot
- Price range
- $10.16–$45.00
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 4K–5K
- Units per listing a year
- 100–250
- Revenue per listing a year
- $3K–$7K
- Returns
- 0.0%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is low.
86% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.3% of listings are out of stock. The average listing ranks #1,492 within Antioxidants. It carries 386 reviews at 4.59 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 86%
- Prime listings
- 100%
- Out of stock, average day
- 0.3%
- Average rank
- #1,492in Antioxidants
- Average rating
- 4.59 starsAmazon United States average 4.42 stars
- Average reviews
- 386per listing
- Listings tracked
- 21
04 · Newcomers
0 of last year's 1 launches cleared the first-year sales bar.
1 products launched here in the last 12 months. 0 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 78 months on average, so the names here are established.
- Launched, last 12 months
- 1
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 78 months
Products
Top Japanese Knotweed products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 25, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Supreme Nutrition Japanese Knotweed Supreme 120 Pure Polygonum cuspidatum Vegetarian Capsules
- Price
- $38.83
- Rating
- 4.6/5
- Reviews
- 326
- Age
- 7y ago

Zenmen Japanese Knotweed Premium Resveratrol USDA 3rd Party Tested Tincture 60ml/2.32 Oz - 1:3 Clinical Strength Ratio - Tick Wellness Aid and Immune Support Supplement - Made in The USA
- Price
- $35.39
- Rating
- 4.5/5
- Reviews
- 146
- Age
- 2y ago

Zenmen Tick Immune Support Supplement - Improved Formula - Japanese Knotweed Cats Claw Chinese Skullcap Cryptolepis Sanguinolenta Sweet Wormwood - 90 Vegan Capsules Made in The USA
- Price
- $37.98
- Rating
- 4.6/5
- Reviews
- 587
- Age
- 5y ago

Nature Restore Japanese Knotweed Extract Powder (8 oz). Natural Trans-Resveratrol for Longevity Sirtuin Activation & Cellular Aging. Also Known as Polygonum Cuspidatum
- Price
- $26.80
- Rating
- 4.2/5
- Reviews
- 435
- Age
- 10y ago

Earthborn Elements Japanese Knotweed Extract 200 Capsules
- Price
- $15.91
- Rating
- 4.5/5
- Reviews
- 140
- Age
- 5y ago
Trending
estimated 90-day click momentum
NutraMedix Japanese Knotweed Supplement - Natural Source of Resveratrol & Polyphenols for Broad-Spectrum Microbial & Tick Immune Support - Bioavailable Antioxidant & Heart Health Tincture (2 Fl oz)
- Price
- $45.00
- Rating
- 5.0/5
- Reviews
- 3
- Age
- 6mo ago

Pure Original Ingredients Japanese Knotweed (4oz) Hu Zhang Traditional Supplement Gluten-Free
- Price
- $10.16
- Rating
- 4.6/5
- Reviews
- 65
- Age
- 5y ago

GAIA HERBS PRO Resveratrol 150 - Offers Heart Health & Immune Support - Contains Japanese Knotweed - Vegan Soy-Free & Gluten-Free - 50 Liquid Phyto-Caps (25 Servings)
- Price
- $31.80
- Rating
- 5.0/5
- Reviews
- 9
- Age
- 3y ago

NU HERBS Brand Organic Japanese Bushy Knotweed Root Cut-Slices/Hu Zhang/Polygonum Cuspidatum 1lb Bulk Herb
- Price
- $37.07
- Rating
- 4.6/5
- Reviews
- 49
- Age
- 13y ago

Japanese Knotweed Capsules 500 mg 100 Capsules Made in USA - Natural Source of Resveratrol Immune Support Supplement Non-GMO Gluten-Free Vegetarian Japanese Knotweed Root for Cardiovascular Health.*
- Price
- $34.84
- Rating
- 4.5/5
- Reviews
- 21
- Age
- 4y ago
Newest
by launch date
NutraMedix Japanese Knotweed Supplement - Natural Source of Resveratrol & Polyphenols for Broad-Spectrum Microbial & Tick Immune Support - Bioavailable Antioxidant & Heart Health Tincture (2 Fl oz)
- Price
- $45.00
- Rating
- 5.0/5
- Reviews
- 3
- Age
- 6mo ago

BLIVA Tick Immune Support Supplement - Japanese Knotweed Cats Claw Chinese Skullcap Cryptolepis - Advanced Tick Herbal Complex Formula - 90 Vegan Capsules
- Price
- $27.79
- Rating
- 4.6/5
- Reviews
- 41
- Age
- 1y ago

Itadori Tea - Organic Black Tea With Japanese Knotweed For Resveratrol & Immune Support Antioxidant-Rich All-Natural Ingredients 14 Tea Bags for Holistic Wellness
- Price
- $24.98
- Rating
- 4.6/5
- Reviews
- 46
- Age
- 1y ago

PURE ORIGINAL INGREDIENTS Japanese Knotweed (8 oz) Hu Zhang Fen Traditional Supplement
- Price
- $15.04
- Rating
- 4.3/5
- Reviews
- 57
- Age
- 2y ago

Zenmen Japanese Knotweed Premium Resveratrol USDA 3rd Party Tested Tincture 60ml/2.32 Oz - 1:3 Clinical Strength Ratio - Tick Wellness Aid and Immune Support Supplement - Made in The USA
- Price
- $35.39
- Rating
- 4.5/5
- Reviews
- 146
- Age
- 2y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 56% of clicks. Leaders hold, but buyers still shop past them.
Brands
17 rising
Sellers
469
Est. top-5 brand share
72%
Top 20: 100%
Est. top-5 click share
56%
Top 20: 99%
Open market
24%
- Zenmen24%
- PURE ORIGINAL INGREDIENTS17%
- Supreme Nutrition Products15%
- Nature Restore8%
- Earthborn Elements8%
- Green Dragon Botanicals4%
Demand
Japanese Knotweed search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: May, Jun · busiest ÷ quietest = 1.6×
Search terms
Top Japanese Knotweed search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- japanese knotweed45K/yr
- knotweed6K/yr
- itadori extract4K/yr
- japanese knotweed capsules4K/yr
Reviews and returns
What reviews say buyers love and hate about Japanese Knotweed
We read the reviews and the return reasons for every product selling here.
“it's way worse if I miss a dose”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
16 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Japanese Knotweed questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









