nsk-sd
Worth a lookShows low returns (0.0%), but a small market ($75K/yr) keeps it on the watch list.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Avg price
Incredible$46.34avg listing price — sweet spot $15–$100
Conversion
Good6.9%search→purchase rate — share of searches ending in a sale
Price range
Good$14.61–$148.01cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Good+32.5%90-day search growth — must beat 0% to launch
Review moat
Good1,247avg incumbent reviews — the moat a new listing must climb
Brand share
Okay80%top-5 brand share — brands hold most of the demand
Competition
Okay65%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Market size
Bad$75K$75K/yr · 23K searches
According to Flapen's Amazon United States niche tracking, nsk-sd is a $75K/yr Amazon United States market (23K searches/yr). The top 5 brands hold 80% of demand. Verdict: Worth a look — 51/100.
Data updated Jul 26, 2026 · scored weekly · How we score niches
nsk-sd market data
- Units sold / yr
- 2K–2K
- avg 100–250/product
- Revenue / yr
- $70K–$93K
- units × avg price
- Conversion rate
- 6.9%
- Avg BSR
- #685
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 94%
- Out of stock
- 0.4%
- Avg brand age
- 62 months
- Avg seller age
- 180 days
Competition & brand share
The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.Brands
13 falling
Sellers
497
Top-5 brand share
80%
Top 20: 100%
Top-5 click share
65%
Top 20: 100%
Open market
16%
- Pure Encapsulations36%
- Source Naturals23%
- Doctor's BEST8%
- SFI Health7%
- Double Wood Supplements6%
- Allergy Research Group5%
- Open — no brand owns it (7 brands, 16%)
Demand
Weekly Amazon search volume, last 29 weeks — +32.5% search growth over the last 90 days.Top nsk-sd search terms
- nsk-sd nattokinase9K/yr
- nattokinase nsk-sd6K/yr
- nsk-sd5K/yr
- pure encapsulations nattokinase4K/yr
Top nsk-sd 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.
All 17 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Pure Encapsulations NSK-SD - 100 mg Nattokinase - for Normal Blood Circulation - Supports Fibrinolytic Activity* - Gluten Free & Non-GMO - 60 Capsules
Pure Encapsulations$80.034.7★277 rev
Source Naturals NSK-SD Nattokinase Systemic Enzyme for Healthy Circulation* 100mg - 60 Vegan Capsules
Source Naturals$19.554.7★311 rev
Pure Encapsulations NSK-SD - 100 mg Nattokinase - for Normal Blood Circulation - Supports Fibrinolytic Activity* - Gluten Free & Non-GMO - 120 Capsules
Pure Encapsulations$148.014.7★277 rev
Doctors Best Nattokinase Non-GMO Vegan Gluten Free 270 Veggie Caps
Doctor's BEST$31.814.6★8,981 rev
Klaire Labs SFI Health Nattokinase NSK-SD - Proteolytic Enzyme for Cardiovascular Support Dairy & Gluten-Free (60 Capsules)
SFI Health$43.724.6★95 rev
Newest
by launch date
Himalaya NSK-SD Nattokinase Dietary Supplement for Healthy Circulation Vegan Gluten Free Natto Extract 100 mg 60 Capsules
Himalaya$51.6942 rev
Nutrient Revolution NSK-SD Nattokinase - Cardiovascular Support - High Potency Nattokinase Supplement - Optimizes Circulation Non-GMO Vegetarian JHFA & JNKA Recognized - 60 Ct
Nutrient Revolution$29.0930 rev
Luma Nutrition Nattokinase Supplement - Natto 4000 FU Per Serving Premium Heart Health Support - Vegan & Gluten Free - 60 Capsules 30 Servings
Luma Nutrition$19.751,584 rev
Source Naturals NSK-SD Nattokinase Vegetarian Friendly Whole Body Systemic Enzyme for Healthy Circulation* 200 mg - 60 Vegetarian Capsules
Source Naturals$31.4828 rev
Source Naturals NSK-SD Nattokinase Vegetarian Friendly Whole Body Systemic Enzyme for Healthy Circulation* 200 mg - 30 Vegetarian Capsules
Source Naturals$15.2628 rev
Trending
90-day click momentumSource Naturals NSK-SD Nattokinase Vegetarian Friendly Whole Body Systemic Enzyme for Healthy Circulation* 200 mg - 60 Vegetarian Capsules
Source Naturals$31.484.9★
Pure Encapsulations NSK-SD - 100 mg Nattokinase - for Normal Blood Circulation - Supports Fibrinolytic Activity* - Gluten Free & Non-GMO - 120 Capsules
Pure Encapsulations$148.014.7★
Allergy Research Group - Nattokinase Supplement NSK-SD 2000 FU 100mg - Cardiovascular/Circulatory Health - 60 Softgels
Allergy Research Group$48.454.6★
Doctors Best Nattokinase Non-GMO Vegan Gluten Free 270 Veggie Caps
Doctor's BEST$31.814.6★
Enzyme Science Nattokinase Pro with NSK-SD - Organic Supplement - Best enzymes for Cardiovascular and Circulatory Support - Vegan and Kosher - 60 Capsules
Enzyme Science$44.244.3★
What buyers say about nsk-sd
What buyers praise and complain about, mined from review topics.What buyers love
“The quality feels consistent”
“AS DESCRIBED”
“Great value”
“Improved cholesterol levels”
“Blood pressure relief”
“Effective”
“Great vitamin”
“Have noticed an improvement in my health”
“Great price per dose too”
“This nattokinase is easy to take”
What buyers complain about
“Need a little higher single capsule dosage”
“Price could be better”
“My cholesterol. bad”
“Really hasnt done much for me”
“Bad quality control”
“Questionable ingredients”
“Not All Is As It Seems”
“Upset stomach”
“About 2 that afternoon my ankles started tingling and burning”
“Can cause stomach issues”
Top return reasons
Common questions
- Is nsk-sd profitable to sell on Amazon United States?
- The niche generates $75K/yr across 17 tracked products. 90-day search growth is +32.5%. Flapen's verdict: Worth a look (51/100).
- How competitive is the nsk-sd niche?
- 13 brands and 497 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 80% of demand.
- What do buyers complain about in nsk-sd?
- Top complaints mined from reviews: Dosage, Value For Money, Heart Health. The return rate is 0.0%.
- What does it cost to enter the nsk-sd niche?
- Listings span $14.61–$148.01; the average listing price is $46.34 (sweet spot $15–$100). The average incumbent carries 1,247 reviews — the moat a new listing must climb.