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.

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.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Market size

Incredible$3.7M

$3.7M/yr · 1.6M searches

Conversion

Incredible13.8%

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

Good70%

top-5 brand share — brands hold most of the demand

Competition

Good51%

top-5 click share — leaders hold, buyers still browse

Review moat

Bad4,396.3

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-8.8%

90-day search growth — must beat 0% to launch

Signals No Dominant Brand

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

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

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.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top selenium search terms

selenium944K/yr -4.0%13.1% conv.
selenium 200mcg capsules174K/yr -15.5%16.7% conv.
selenium supplements for women183K/yr -44.9%9.0% conv.
selenio54K/yr +12.9%3.3% conv.
selenium 200mcg33K/yr +90.9%14.1% conv.
selenium supplement60K/yr -14.7%9.2% conv.
selenio organico para tiroides31K/yr -10.4%2.4% conv.
selen38K/yr -8.3%1.1% conv.
selenomethionine29K/yr -18.4%8.2% conv.
selenio 200mg25K/yr -0.5%5.0% conv.

All 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.

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

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$13.534.7★4,463 rev

Nutricost Selenium 200mcg 240 Vegetarian Capsules L-Selenomethionine

Nutricost$13.794.7★3,684 rev

NOW Supplements Selenium (L-Selenomethionine) 100 mcg Essential Mineral* 100 Tablets

NOW Foods$4.994.7★4,266 rev

Bronson Selenium 200 mcg Yeast Free Chelated Amino Acid Complex - Essential Trace Mineral with Superior Absorption 250 Vegetarian Capsules

Bronson$14.924.7★14,686 rev

Pure Encapsulations Selenium - 200 mcg - for Healthy Cellular Function Immune System & Antioxidant Defenses* - Mineral Supplement - Vegan & Gluten Free - 180 Capsules

Pure Encapsulations$35.954.6★5,733 rev

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$21.63462 rev

1y ago

NEW AGE Selenium Zinc Iodine L Tyrosine Ashwagandha - Supplement for Women and Men with Bladderwrack Turmeric Silica Kelp Schisandra - 120 Count

NEW AGE$33.811,179 rev

1y ago

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$16.56170 rev

2y ago

Horbach Selenium Supplement for Women & Men | 200mcg | 120 Tablets

Horbäach$6.75635 rev

2y ago

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$25.413,438 rev

3y ago

What buyers say about selenium

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall17%

“The quality seems consistent”

Vitamin8%

“Best supplement”

Hormonal Balance8%

“If you have thyroid issues this may help balance you hormones”

Value For Money7%

“Worth every penny”

Advertised Vs Actual Product5%

“It has an accurate description”

Energy Level5%

“it has helped with energy”

Efficiency4%

“Effective”

Regulates Digestion4%

“No issues with digestion or side effects”

Ease Of Chewing/Swallowing3%

“The capsules are easy to take”

Dosage3%

“Perfect addition to my routine”

What buyers complain about

Smell13%

“it has disgusting smell”

Side Effects10%

“Side effects”

Size-Overall8%

“they are HUGE”

Dosage8%

“appears to exceed safe/legal dosage limits”

Functionality-Overall7%

“Started havent seen results”

Ingredients-Overall4%

“I have no idea which ingredient it is”

Value For Money3%

“it didnt seem worth the price”

Ease Of Chewing/Swallowing3%

“Hard to Swallow”

Vitamin3%

“Way too many B Vitamins in this product”

Regulates Digestion3%

“May cause gastrointestinal issues”

Top return reasons

Functionality-Overall30%

Dosage15%

Acid Regulator/Stomach Ache Relief15%

Size-Overall10%

Color10%

Joint Pain10%

Product Condition5%

Vitamin5%

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.