---
title: "Selenium 100 Mcg — $177K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/selenium-100-mcg"
last_updated: "2026-08-07T09:10:59.211Z"
locale: en
meta:
description: "Niche score 49/100 · $177K/yr market · 70K searches/yr · $16.17 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 49/100 · $177K/yr market · 70K searches/yr · $16.17 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Selenium 100 Mcg — $177K/yr Amazon US Niche (2026) - Flapen"
---
# **selenium 100 mcg**
**Skip it**
Soft demand (-10.1% this quarter) — this niche doesn't clear our bar today.
Market size 36Growth 20Conversion 97Competition 43Returns 100Price range 71Avg price 78Brand share 33Review moat 38Quality gap 23
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****15.6%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$16.17**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$4.99–$39.34**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****59%**
top-5 click share — leaders hold, buyers still browse
**Review moat**
**Okay****2,693.71**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Okay****$177K**
$177K/yr · 70K searches
**Brand share**
**Okay****85%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-10.1%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, selenium 100 mcg is a $177K/yr Amazon United States market (70K searches/yr). The top 5 brands hold 85% of demand. Demand peaks in Sep–Oct–Nov–Dec. Verdict: Skip it — 49/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **selenium 100 mcg market data**
- **Units sold / yr**
- **10K–13K**
- avg 500–750/product
- **Revenue / yr**
- **$162K–$202K**
- units × avg price
- **Conversion rate**
- **15.6%**
- **Avg BSR**
- **#124**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **67%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **120 months**
- **Avg seller age**
- **168 days**
## **Competition & brand share**
The top 5 products take 59% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**12 **▲rising
**Sellers**
**551**
**Top-5 brand share**
**85%**
Top 20: 100%
**Top-5 click share**
**59%**
Top 20: 99%
**Open market**
**10%**
- NOW Foods56% - Nutricost10% - Amazing Nutrition7% - Pure Encapsulations6% - THORNE5% - SOLARAY5% - Open — no brand owns it (6 brands, 10%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -10.1% search growth over the last 90 days.
25K15KSpike '24Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct, Nov, Dec · busiest ÷ quietest = 13.0×
[**Open Trend **](https://flapen.com/research/us/health-household/selenium-100-mcg/trend)
## **Top selenium 100 mcg search terms**
- **selenium 100 mcg**38K/yr-30.6%13.8% conv. - **selenium 100mcg**6K/yr+156.6%14.6% conv. - **now selenium 200 mcg**6K/yr+26.6%18.5% conv. - **now selenium**8K/yr-25.6%14.6% conv. - **selenium now**4K/yr-9.7%15.8% conv. - **selenio 100mg**3K/yr-24.5%6.6% conv. - **selenium 100**3K/yr-10.0%13.6% conv. - **now foods selenium 200 mcg**2K/yr+11.0%16.4% conv. [**All search terms **](https://flapen.com/research/us/health-household/selenium-100-mcg/search-terms)
## **Top selenium 100 mcg 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%$9K10%$18K15%$27K20%$35K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 21 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NOW Foods Supplements Selenium (L-Selenomethionine) 100 mcg Essential Mineral* 250 Tablets**NOW Foods**$9.27**4.7★4,266 rev](https://www.amazon.com/dp/B000G24ZW6) [2**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★7,820 rev](https://www.amazon.com/dp/B08Q3KPFGM) [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**Nutricost Selenium Supplement 100mcg 240 Capsules Vegetarian Gluten-Free**Nutricost**$12.73**4.6★284 rev](https://www.amazon.com/dp/B0B7C6L4BT) [5**Amazing Formulas Selenium Supplement | 100 Mcg Per Serving | 250 Tablets | Non-GMO | Gluten Free | Made in USA**Amazing Nutrition**$9.80**4.6★110 rev](https://www.amazon.com/dp/B0BZWHCFCT)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Amazing Formulas Selenium Supplement | 100 Mcg Per Serving | 250 Tablets | Non-GMO | Gluten Free | Made in USA**Amazing Nutrition**$9.80**110 rev3y ago](https://www.amazon.com/dp/B0BZWHCFCT) [**Nutricost Selenium Supplement 100mcg 240 Capsules Vegetarian Gluten-Free**Nutricost**$12.73**284 rev4y ago](https://www.amazon.com/dp/B0B7C6L4BT) [**Designs for Health Thyrommune - Thyroid Support Supplement with Selenium (Selenomethionine) + Myo-Inositol - Vegan & Gluten-Free (60 Capsules)**Designs for Health**$27.63**161 rev4y ago](https://www.amazon.com/dp/B09Y8HKNZC) [**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**7,820 rev5y ago](https://www.amazon.com/dp/B08Q3KPFGM) [**Now Selenium 200mcg Capsules 300 Count (Pack of 2) - L Selenomethionine Mineral Supplement for Women & Men - Veg Caps Non-GMO Vegan Friendly Yeast-Free**NOW Foods**$39.34**106 rev6y ago](https://www.amazon.com/dp/B0885R2826)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Designs for Health Thyrommune - Thyroid Support Supplement with Selenium (Selenomethionine) + Myo-Inositol - Vegan & Gluten-Free (60 Capsules)**Designs for Health**$27.63**4.5★**▲ 61%**](https://www.amazon.com/dp/B09Y8HKNZC) [**NOW Foods Supplements Selenium (L-Selenomethionine) 200 mcg Essential Mineral* 90 Veg Capsules**NOW Foods**$6.50**4.6★**▲ 60%**](https://www.amazon.com/dp/B0013OUTO4) [**Amazing Formulas Selenium Supplement | 100 Mcg Per Serving | 250 Tablets | Non-GMO | Gluten Free | Made in USA**Amazing Nutrition**$9.80**4.6★**▲ 52%**](https://www.amazon.com/dp/B0BZWHCFCT) [**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★**▲ 24%**](https://www.amazon.com/dp/B00B5N9IDQ) [**Nutricost Selenium Supplement 100mcg 240 Capsules Vegetarian Gluten-Free**Nutricost**$12.73**4.6★**▲ 20%**](https://www.amazon.com/dp/B0B7C6L4BT)
**~~View all trending →~~**
## **What buyers say about selenium 100 mcg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**22%
*“The quality seems consistent”*
**Vitamin**9%
*“Great price for these vitamins”*
**Value For Money**9%
*“its pretty affordable”*
**Advertised Vs Actual Product**8%
*“It has an accurate description”*
**Efficiency**6%
*“Effective”*
**Ease Of Chewing/Swallowing**5%
*“Easy to swallow”*
**Hormonal Balance**5%
*“I use this to take with my thyroid medication because it helps it to work better”*
**Regulates Digestion**3%
*“It is the gentle push my thyroid needed”*
**Nutritional Content**3%
*“Great quality supplement”*
**Energy Level**3%
*“Has been certainly boosting my energy”*
### **What buyers complain about **
**Smell**29%
*“it has disgusting smell”*
**Size-Overall**5%
*“They are very small”*
**Energy Level**5%
*“It didn't give me energy”*
**Dosage**5%
*“Cannot force myself to take this more than once”*
**Value For Money**5%
*“a total waste of money”*
**Side Effects**4%
*“Caused brain fog”*
**Functionality-Overall**4%
*“Started havent seen results”*
**Taste-Overall**3%
*“It didnt taste funky”*
**Ingredients-Overall**3%
*“empty half a selenium capsule into one”*
**Quality-Overall**3%
*“There are better priced quality products”*
### **Top return reasons **
**Joint Pain**33%
**Functionality-Overall**33%
**Color**33%
## **Common questions**
- **Is selenium 100 mcg profitable to sell on Amazon United States?**
- The niche generates $177K/yr across 21 tracked products. 90-day search growth is -10.1%. Flapen's verdict: Skip it (49/100).
- **How competitive is the selenium 100 mcg niche?**
- 12 brands and 551 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 85% of demand.
- **What do buyers complain about in selenium 100 mcg?**
- Top complaints mined from reviews: Smell, Size-Overall, Energy Level. The return rate is 0.0%.
- **When does demand for selenium 100 mcg peak?**
- Demand peaks in Sep–Oct–Nov–Dec; the busiest month runs 13.0× the quietest.
- **What does it cost to enter the selenium 100 mcg niche?**
- Listings span $4.99–$39.34; the average listing price is $16.17 (sweet spot $15–$100). The average incumbent carries 2,694 reviews — the moat a new listing must climb.
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