quercetin
Worth a lookShows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Market size
Incredible$6.4M$6.4M/yr · 2.2M searches
Conversion
Incredible12.3%search→purchase rate — share of searches ending in a sale
Avg price
Incredible$24.21avg listing price — sweet spot $15–$100
Brand share
Great52%top-5 brand share — no brand owns this niche
Price range
Great$8.00–$47.39cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Great38%top-5 click share — an open shelf
Review moat
Bad4,456.55avg incumbent reviews — the moat a new listing must climb
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Growth
Bad-18.4%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, quercetin is a $6.4M/yr Amazon United States market (2.2M searches/yr). The top 5 brands hold 52% of demand. Verdict: Worth a look — 69/100.
Data updated Jul 25, 2026 · scored weekly · How we score niches
quercetin market data
- Units sold / yr
- 250K–300K
- avg 6,000–8,000/product
- Revenue / yr
- $6.1M–$7.3M
- units × avg price
- Conversion rate
- 12.3%
- Avg BSR
- #160
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 86%
- Out of stock
- 0.6%
- Avg brand age
- 64 months
- Avg seller age
- 146 days
Competition & brand share
Clicks spread well past the top 5 (38% combined) — an open shelf where new products get seen.Brands
30 rising
Sellers
322
Top-5 brand share
52%
Top 20: 92%
Top-5 click share
38%
Top 20: 82%
Open market
43%
- NOW Foods24%
- Pure Encapsulations7%
- ForestLeaf7%
- Double Wood Supplements7%
- Nutricost7%
- NatureBell5%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -18.4% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Top quercetin search terms
- quercetin1.2M/yr
- quercetin with bromelain465K/yr
- quercetin 500mg capsules103K/yr
- quercetin 1000mg53K/yr
- quercetin supplements86K/yr
- quercitin43K/yr
- quercetin 500mg33K/yr
- now quercetin with bromelain27K/yr
- quercetin bromelain23K/yr
- quer18K/yr
Top quercetin 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 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
NOW Foods Supplements Quercetin with Bromelain Balanced Immune System* 120 Veg Capsules
NOW Foods$21.434.7★21,602 rev
NOW Foods Supplements Quercetin with Bromelain Balanced Immune System* 240 Veg Capsules
NOW Foods$30.504.7★21,602 rev
ForestLeaf Quercetin with Bromelain 1350mg - Blend with Vitamin C & Stinging Nettle Supplement Quercetin 500mg Capsules Non-GMO Gluten Free Natural Function 90 Veggie Caps
ForestLeaf$23.214.7★8,581 rev
Quercetin with Bromelain - 96% Highly Purified - 120 Count (1 200mg Servings) - Supports Healthy Immune Functions in Men and Women (Vegan Safe Third Party Tested Gluten Free) by Double Wood
Double Wood Supplements$23.604.7★4,943 rev
NOW Supplements Quercetin with Bromelain Balanced Immune System* 60 Veg Capsules
NOW Foods$12.564.7★21,602 rev
Newest
by launch date
Bronson Quercetin with Bromelain 2 in 1 Wellness Support Non-GMO 60 Capsules
Bronson$9.99121 rev
Biosyntra Pure Quercetin 500mg - Pure Quercetin Capsules for Immune Support & Cellular Protection Gluten-Free Non-GMO 120 Capsules
Biosyntra$10.1997 rev
Natures Bounty Quercetin Immune Support 500mg With Vitamin C Rose Hips & Rutin 60 count
Nature's Bounty$14.88219 rev
NOW Supplements Quercetin with Bromelain Balanced Immune System* 60 Veg Capsules
NOW Foods$12.5621,602 rev
Pure Encapsulations Quercetin UltraSorb | Enhanced-Absorption Cellular Immune and Cardiovascular Support* | 90 Capsules
Pure Encapsulations$47.39213 rev
Trending
90-day click momentumBronson Quercetin with Bromelain 2 in 1 Wellness Support Non-GMO 60 Capsules
Bronson$9.994.6★
Biosyntra Pure Quercetin 500mg - Pure Quercetin Capsules for Immune Support & Cellular Protection Gluten-Free Non-GMO 120 Capsules
Biosyntra$10.194.6★
Life Extension Bio-Quercetin Immune Health Supplement Heart Health Support Gluten Free Non-GMO Vegetarian 30 Capsules
Life Extension$8.004.6★
Nutricost Quercetin 880mg 240 Vegetarian Capsules with Bromelain (165mg) - 120 Servings (440mg Quercetin Per Cap) - Gluten Free Non-GMO
Nutricost$32.944.7★
NOW Supplements Quercetin with Bromelain Balanced Immune System* 60 Veg Capsules
NOW Foods$12.564.7★
What buyers say about quercetin
What buyers praise and complain about, mined from review topics.What buyers love
“The quality feels solid”
“Excellent brand of vitamin”
“Great supplement for immune”
“Great allergy relief”
“Reasonably priced”
“Works Well”
“As advertised”
“Ingredients are good”
“Help with inflammation”
“Easy Digest”
What buyers complain about
“I seem to be allergic to it”
“Dosing vs bottle qty = ridiculous”
“Waste of money”
“Causes nausea”
“Doesn't help 100%”
“Since their Quality Control seems to be lacking”
“HUGE”
“Not displayed in ad”
“Fishy smell”
“These look like you are supposed to chew them”
Top return reasons
Common questions
- Is quercetin profitable to sell on Amazon United States?
- The niche generates $6.4M/yr across 42 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -18.4%. Flapen's verdict: Worth a look (69/100).
- How competitive is the quercetin niche?
- 30 brands and 322 sellers compete. The top 5 products take 38% of clicks and top 5 brands hold 52% of demand.
- What do buyers complain about in quercetin?
- Top complaints mined from reviews: Allergies, Dosage, Value For Money. The return rate is 0.0%.
- When does demand for quercetin peak?
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- What does it cost to enter the quercetin niche?
- Listings span $8.00–$47.39; the average listing price is $24.21 (sweet spot $15–$100). The average incumbent carries 4,457 reviews — the moat a new listing must climb.