---
title: "Selenomethionine — $327K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/selenomethionine"
last_updated: "2026-08-11T08:01:38.589Z"
locale: en
meta:
description: "Niche score 45/100 · $327K/yr market · 87K searches/yr · $19.10 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 45/100 · $327K/yr market · 87K searches/yr · $19.10 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Selenomethionine — $327K/yr Amazon US Niche (2026) - Flapen"
---
# **selenomethionine**
**Skip it**
Brand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.
Market size 52Growth 22Conversion 100Competition 8Returns 100Price range 68Avg price 85Brand share 7Review moat 32Quality gap 23
**Conversion**
**Incredible****19.7%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$19.10**
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
**Market size**
**Good****$327K**
$327K/yr · 87K searches
**Review moat**
**Okay****3,296**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-5.8%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****91%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, selenomethionine is a $327K/yr Amazon United States market (87K searches/yr). The top 5 brands hold 97% of demand. Demand peaks in Jan. Verdict: Skip it — 45/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **selenomethionine market data**
- **Units sold / yr**
- **15K–20K**
- avg 2,500–3,000/product
- **Revenue / yr**
- **$287K–$382K**
- units × avg price
- **Conversion rate**
- **19.7%**
- **Avg BSR**
- **#83**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **88%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **102 months**
- **Avg seller age**
- **175 days**
## **Competition & brand share**
The top 5 products capture 91% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **▲rising
**Sellers**
**17**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**91%**
Top 20: 100%
**Open market**
**0%**
- THORNE56% - Pure Encapsulations31% - Nutricost4% - NOW Foods3% - BIOTICS RESEARCH3% - Triquetra Health3%
## **Demand & seasonality**
Weekly Amazon search volume, last 103 weeks — -5.8% search growth over the last 90 days.
4K3KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jan · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/us/health-household/selenomethionine/trend)
## **Top selenomethionine search terms**
- **selenomethionine**29K/yr-18.4%7.7% conv. - **thorne selenium**23K/yr+4.7%25.8% conv. - **pure selenium**9K/yr+6.9%17.7% conv. - **thorne selenium 200mcg capsules**9K/yr-17.1%32.4% conv. - **pure encapsulations selenium**8K/yr+4.4%16.2% conv. - **selenium thorne**4K/yr+12.6%24.2% conv. - **selenium pure encapsulations**4K/yr-0.9%22.0% conv. - **selenomethionine 200mcg organic**1K/yr-16.9%7.3% conv. [**All search terms **](https://flapen.com/research/us/health-household/selenomethionine/search-terms)
## **Top selenomethionine 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%15%$49K30%$98K45%$147K60%$196K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 8 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**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) [3**Pure Encapsulations Selenium - 200 mcg - for Healthy Cellular Function Immune System & Antioxidant Defenses* - Mineral Supplement - Vegan & Gluten Free - 60 Capsules**Pure Encapsulations**$14.22**4.6★5,733 rev](https://www.amazon.com/dp/B000H85L5Y) [4**Pure Encapsulations Selenium (Citrate) - for Immune System Support & Cellular Health - Antioxidant Supplement - Supports Blood Flow* - Gluten Free & Vegan - 180 Capsules**Pure Encapsulations**$28.65**4.8★963 rev](https://www.amazon.com/dp/B0017I0MCA) [5**Nutricost Selenium 200mcg 240 Vegetarian Capsules L-Selenomethionine**Nutricost**$13.79**4.7★3,684 rev](https://www.amazon.com/dp/B079B2PDW1)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**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**1,423 rev6y ago](https://www.amazon.com/dp/B07YN46F7V) [**Biotics Research Selenomethionine High Potency Selenium Thyroid Gland Function DNA Production Cognitive Health Potent Antioxidant. 90 Capsules**BIOTICS RESEARCH**$20.00**103 rev8y ago](https://www.amazon.com/dp/B07F3FDWRJ) [**Nutricost Selenium 200mcg 240 Vegetarian Capsules L-Selenomethionine**Nutricost**$13.79**3,684 rev8y ago](https://www.amazon.com/dp/B079B2PDW1) [**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**4,463 rev13y ago](https://www.amazon.com/dp/B00B5N9IDQ) [**Pure Encapsulations Selenium - 200 mcg - for Healthy Cellular Function Immune System & Antioxidant Defenses* - Mineral Supplement - Vegan & Gluten Free - 60 Capsules**Pure Encapsulations**$14.22**5,733 rev16y ago](https://www.amazon.com/dp/B000H85L5Y)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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★**▲ 31%**](https://www.amazon.com/dp/B07YN46F7V) [**Pure Encapsulations Selenium (Citrate) - for Immune System Support & Cellular Health - Antioxidant Supplement - Supports Blood Flow* - Gluten Free & Vegan - 180 Capsules**Pure Encapsulations**$28.65**4.8★**▲ 18%**](https://www.amazon.com/dp/B0017I0MCA) [**Biotics Research Selenomethionine High Potency Selenium Thyroid Gland Function DNA Production Cognitive Health Potent Antioxidant. 90 Capsules**BIOTICS RESEARCH**$20.00**4.5★**▲ 10%**](https://www.amazon.com/dp/B07F3FDWRJ) [**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★**— 2%**](https://www.amazon.com/dp/B00B5N9IDQ) [**Pure Encapsulations Selenium - 200 mcg - for Healthy Cellular Function Immune System & Antioxidant Defenses* - Mineral Supplement - Vegan & Gluten Free - 60 Capsules**Pure Encapsulations**$14.22**4.6★**— 2%**](https://www.amazon.com/dp/B000H85L5Y)
**~~View all trending →~~**
## **What buyers say about selenomethionine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**23%
*“Great quality supplement”*
**Value For Money**9%
*“Worth it”*
**Vitamin**8%
*“EXCELLENT SUPPLEMENTS”*
**Advertised Vs Actual Product**5%
*“It has an accurate description”*
**Ease Of Chewing/Swallowing**4%
*“Easy to swallow”*
**Hormonal Balance**4%
*“Good for thyroid”*
**Energy Level**3%
*“Has been certainly boosting my energy”*
**Regulates Digestion**3%
*“is a good product especially when you have thyroid problem this is a good supplement that we all need if you suffer from thyroid so I recommend it”*
**Ingredients-Overall**3%
*“The ingredients are great and clean”*
**Dosage**3%
*“the dosage is straightforward”*
### **What buyers complain about **
**Smell**29%
*“had an odd odor”*
**Dosage**7%
*“That said, the smell coming from the capsule is so foul, I could not take it more than one day”*
**Size-Overall**7%
*“They are very small”*
**Functionality-Overall**5%
*“Started havent seen results”*
**Ingredients-Overall**4%
*“empty half a selenium capsule into one”*
**Immunity Booster**3%
*“I have a couple of immune issues”*
**Magnesium**3%
*“Not good magnesium”*
**Strength**3%
*“strength too much”*
**Energy Level**3%
*“Haven't seen a difference in energy or anything”*
**Value For Money**3%
*“Too expensive”*
### **Top return reasons **
**Functionality-Overall**33%
**Joint Pain**33%
**Color**33%
## **Common questions**
- **Is selenomethionine profitable to sell on Amazon United States?**
- The niche generates $327K/yr across 8 tracked products. 90-day search growth is -5.8%. Flapen's verdict: Skip it (45/100).
- **How competitive is the selenomethionine niche?**
- 6 brands and 17 sellers compete. The top 5 products take 91% of clicks and top 5 brands hold 97% of demand.
- **What do buyers complain about in selenomethionine?**
- Top complaints mined from reviews: Smell, Dosage, Size-Overall. The return rate is 0.0%.
- **When does demand for selenomethionine peak?**
- Demand peaks in Jan; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the selenomethionine niche?**
- Listings span $4.99–$35.95; the average listing price is $19.10 (sweet spot $15–$100). The average incumbent carries 3,296 reviews — the moat a new listing must climb.
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