---
title: "Selenium — $3.7M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/selenium"
last_updated: "2026-08-10T08:49:50.027Z"
locale: en
meta:
description: "Niche score 62/100 · $3.7M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 62/100 · $3.7M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Selenium — $3.7M/yr Amazon US Niche (2026) - Flapen"
---
# **selenium**
**Worth a look**
Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 96Growth 21Conversion 96Competition 56Returns 100Price range 68Avg price 79Brand share 58Review moat 25Quality gap 23
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Market size**
**Incredible****$3.7M**
$3.7M/yr · 1.6M searches
**Conversion**
**Incredible****13.8%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$16.40**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$4.99–$35.95**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****70%**
top-5 brand share — brands hold most of the demand
**Competition**
**Good****51%**
top-5 click share — leaders hold, buyers still browse
**Review moat**
**Bad****4,396.3**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-8.8%**
90-day search growth — must beat 0% to launch
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United States niche tracking, selenium is a $3.7M/yr Amazon United States market (1.6M searches/yr). The top 5 brands hold 70% of demand. Verdict: Worth a look — 62/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **selenium market data**
- **Units sold / yr**
- **200K–250K**
- avg 8,000–10,000/product
- **Revenue / yr**
- **$3.3M–$4.1M**
- units × avg price
- **Conversion rate**
- **13.8%**
- **Avg BSR**
- **#84**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **78%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **83 months**
- **Avg seller age**
- **151 days**
## **Competition & brand share**
The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**16 **▼falling
**Sellers**
**35**
**Top-5 brand share**
**70%**
Top 20: 100%
**Top-5 click share**
**51%**
Top 20: 97%
**Open market**
**24%**
- THORNE18% - Bronson17% - Pure Encapsulations12% - NOW Foods12% - Nutricost11% - Nature's Bounty6%
## **Demand & seasonality**
Weekly Amazon search volume, last 103 weeks — -8.8% search growth over the last 90 days.
35K25KSpike '25Prime Day '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/health-household/selenium/trend)
## **Top selenium search terms**
- **selenium**944K/yr-4.0%13.1% conv. - **selenium 200mcg capsules**174K/yr-15.5%16.7% conv. - **selenium supplements for women**183K/yr-44.9%9.0% conv. - **selenio**54K/yr+12.9%3.3% conv. - **selenium 200mcg**33K/yr+90.9%14.1% conv. - **selenium supplement**60K/yr-14.7%9.2% conv. - **selenio organico para tiroides**31K/yr-10.4%2.4% conv. - **selen**38K/yr-8.3%1.1% conv. - **selenomethionine**29K/yr-18.4%8.2% conv. - **selenio 200mg**25K/yr-0.5%5.0% conv. [**All search terms **](https://flapen.com/research/us/health-household/selenium/search-terms)
## **Top selenium 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.
0%5%$186K10%$372K15%$558K20%$744K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 23 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**THORNE - Selenium - 200 mcg Selenium Supplement for Antioxidant Support - Supports Thyroid Health Immune Function & Healthy Aging - Third-Party Certified - Gluten Dairy & Soy-Free - 60 Capsules**THORNE**$13.53**4.7★4,463 rev](https://www.amazon.com/dp/B00B5N9IDQ) [2**Nutricost Selenium 200mcg 240 Vegetarian Capsules L-Selenomethionine**Nutricost**$13.79**4.7★3,684 rev](https://www.amazon.com/dp/B079B2PDW1) [3**NOW Supplements Selenium (L-Selenomethionine) 100 mcg Essential Mineral* 100 Tablets**NOW Foods**$4.99**4.7★4,266 rev](https://www.amazon.com/dp/B000A2L8NQ) [4**Bronson Selenium 200 mcg Yeast Free Chelated Amino Acid Complex - Essential Trace Mineral with Superior Absorption 250 Vegetarian Capsules**Bronson**$14.92**4.7★14,686 rev](https://www.amazon.com/dp/B004MNBMZS) [5**Pure Encapsulations Selenium - 200 mcg - for Healthy Cellular Function Immune System & Antioxidant Defenses* - Mineral Supplement - Vegan & Gluten Free - 180 Capsules**Pure Encapsulations**$35.95**4.6★5,733 rev](https://www.amazon.com/dp/B0017I2CLY)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Selenium Supplements for Women & Men 200mcg Per Serving 500 Softgels | Made with Coconut Oil | Essential Trace Mineral as L-Selenomethionine | 16+ Month Supply | Non-GMO Gluten Free**Micro Ingredients**$21.63**462 rev1y ago](https://www.amazon.com/dp/B0F3GKVDHY) [**NEW AGE Selenium Zinc Iodine L Tyrosine Ashwagandha - Supplement for Women and Men with Bladderwrack Turmeric Silica Kelp Schisandra - 120 Count**NEW AGE**$33.81**1,179 rev1y ago](https://www.amazon.com/dp/B0DCPDVXV5) [**BulkSupplements.com Selenium Glycinate Capsules - Selenium Supplement Selenium 200mcg Capsules - Essential Trace Mineral Gluten Free 1 Capsule per Serving 500 Count (Pack of 1)**BulkSupplements**$16.56**170 rev2y ago](https://www.amazon.com/dp/B0CXBKQQ5F) [**Horbach Selenium Supplement for Women & Men | 200mcg | 120 Tablets**Horbäach**$6.75**635 rev2y ago](https://www.amazon.com/dp/B0CGML21X7) [**Clean Nutra Selenium 300mcg Iodine 500mcg Thyroid Support for Women & Men | L Tyrosine 500mg Ashwagandha Supplement Bladderwrack Turmeric Kelp Schisandra Zinc Pills Capsule Supplements**Clean Nutraceuticals**$25.41**3,438 rev3y ago](https://www.amazon.com/dp/B0BT6C8NGW)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Now Foods Selenium 200mcg Capsules 300 Count - L Selenomethionine Mineral Supplement for Women & Men - Veg Caps Non-GMO Vegan Friendly Yeast-Free**NOW Foods**$23.36**4.6★**▲ 81%**](https://www.amazon.com/dp/B08Q3KPFGM) [**BulkSupplements.com Selenium Glycinate Capsules - Selenium Supplement Selenium 200mcg Capsules - Essential Trace Mineral Gluten Free 1 Capsule per Serving 500 Count (Pack of 1)**BulkSupplements**$16.56**4.6★**▲ 65%**](https://www.amazon.com/dp/B0CXBKQQ5F) [**NOW Supplements Selenium (L-Selenomethionine) 100 mcg Essential Mineral* 100 Tablets**NOW Foods**$4.99**4.7★**▲ 37%**](https://www.amazon.com/dp/B000A2L8NQ) [**Selenium - 200 mcg Selenomethionine Form 300 Servings - Vegan Glass Bottle Yeast Free - Sublingual Liquid Concentrate - Antioxidant Supports Immunity Thyroid Health (2 oz.)**Triquetra Health**$21.71**4.5★**▲ 23%**](https://www.amazon.com/dp/B07YN46F7V) [**Life Extension Super Selenium Complex 200 mcg 3 Forms of Selenium Vitamin E Cellular Health & Longevity Support Gluten-Free Non-GMO Vegetarian 1 Daily 100 Capsules**Life Extension**$9.63**4.6★**▲ 21%**](https://www.amazon.com/dp/B009EA6FZG)
**~~View all trending →~~**
## **What buyers say about selenium**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**17%
*“The quality seems consistent”*
**Vitamin**8%
*“Best supplement”*
**Hormonal Balance**8%
*“If you have thyroid issues this may help balance you hormones”*
**Value For Money**7%
*“Worth every penny”*
**Advertised Vs Actual Product**5%
*“It has an accurate description”*
**Energy Level**5%
*“it has helped with energy”*
**Efficiency**4%
*“Effective”*
**Regulates Digestion**4%
*“No issues with digestion or side effects”*
**Ease Of Chewing/Swallowing**3%
*“The capsules are easy to take”*
**Dosage**3%
*“Perfect addition to my routine”*
### **What buyers complain about **
**Smell**13%
*“it has disgusting smell”*
**Side Effects**10%
*“Side effects”*
**Size-Overall**8%
*“they are HUGE”*
**Dosage**8%
*“appears to exceed safe/legal dosage limits”*
**Functionality-Overall**7%
*“Started havent seen results”*
**Ingredients-Overall**4%
*“I have no idea which ingredient it is”*
**Value For Money**3%
*“it didnt seem worth the price”*
**Ease Of Chewing/Swallowing**3%
*“Hard to Swallow”*
**Vitamin**3%
*“Way too many B Vitamins in this product”*
**Regulates Digestion**3%
*“May cause gastrointestinal issues”*
### **Top return reasons **
**Functionality-Overall**30%
**Dosage**15%
**Acid Regulator/Stomach Ache Relief**15%
**Size-Overall**10%
**Color**10%
**Joint Pain**10%
**Product Condition**5%
**Vitamin**5%
## **Common questions**
- **Is selenium profitable to sell on Amazon United States?**
- The niche generates $3.7M/yr across 23 tracked products. 90-day search growth is -8.8%. Flapen's verdict: Worth a look (62/100).
- **How competitive is the selenium niche?**
- 16 brands and 35 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 70% of demand.
- **What do buyers complain about in selenium?**
- Top complaints mined from reviews: Smell, Side Effects, Size-Overall. The return rate is 0.0%.
- **When does demand for selenium peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the selenium niche?**
- Listings span $4.99–$35.95; the average listing price is $16.40 (sweet spot $15–$100). The average incumbent carries 4,396 reviews — the moat a new listing must climb.
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