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.

selenomethionine

Skip it

Brand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.

Conversion

Incredible19.7%

search→purchase rate — share of searches ending in a sale

Returns

Incredible0.0%

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

Okay3,296

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-5.8%

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

Competition

Bad91%

top-5 click share — a locked-up shelf

Brand share

Bad97%

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

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

Top-5 brand share

97%

Top 20: 100%

Top-5 click share

91%

Top 20: 100%

Open market

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.

Peak months: Jan · busiest ÷ quietest = 1.9×

Open Trend

Top selenomethionine search terms

selenomethionine29K/yr -18.4%7.7% conv.
thorne selenium23K/yr +4.7%25.8% conv.
pure selenium9K/yr +6.9%17.7% conv.
thorne selenium 200mcg capsules9K/yr -17.1%32.4% conv.
pure encapsulations selenium8K/yr +4.4%16.2% conv.
selenium thorne4K/yr +12.6%24.2% conv.
selenium pure encapsulations4K/yr -0.9%22.0% conv.
selenomethionine 200mcg organic1K/yr -16.9%7.3% conv.

All 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.

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

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

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

Pure Encapsulations Selenium - 200 mcg - for Healthy Cellular Function Immune System & Antioxidant Defenses* - Mineral Supplement - Vegan & Gluten Free - 60 Capsules

Pure Encapsulations$14.224.6★5,733 rev

Pure Encapsulations Selenium (Citrate) - for Immune System Support & Cellular Health - Antioxidant Supplement - Supports Blood Flow* - Gluten Free & Vegan - 180 Capsules

Pure Encapsulations$28.654.8★963 rev

Nutricost Selenium 200mcg 240 Vegetarian Capsules L-Selenomethionine

Nutricost$13.794.7★3,684 rev

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$21.711,423 rev

6y ago

Biotics Research Selenomethionine High Potency Selenium Thyroid Gland Function DNA Production Cognitive Health Potent Antioxidant. 90 Capsules

BIOTICS RESEARCH$20.00103 rev

8y ago

Nutricost Selenium 200mcg 240 Vegetarian Capsules L-Selenomethionine

Nutricost$13.793,684 rev

8y ago

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$13.534,463 rev

13y ago

Pure Encapsulations Selenium - 200 mcg - for Healthy Cellular Function Immune System & Antioxidant Defenses* - Mineral Supplement - Vegan & Gluten Free - 60 Capsules

Pure Encapsulations$14.225,733 rev

16y ago

What buyers say about selenomethionine

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

What buyers love

Quality-Overall23%

“Great quality supplement”

Value For Money9%

“Worth it”

Vitamin8%

“EXCELLENT SUPPLEMENTS”

Advertised Vs Actual Product5%

“It has an accurate description”

Ease Of Chewing/Swallowing4%

“Easy to swallow”

Hormonal Balance4%

“Good for thyroid”

Energy Level3%

“Has been certainly boosting my energy”

Regulates Digestion3%

“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-Overall3%

“The ingredients are great and clean”

Dosage3%

“the dosage is straightforward”

What buyers complain about

Smell29%

“had an odd odor”

Dosage7%

“That said, the smell coming from the capsule is so foul, I could not take it more than one day”

Size-Overall7%

“They are very small”

Functionality-Overall5%

“Started havent seen results”

Ingredients-Overall4%

“empty half a selenium capsule into one”

Immunity Booster3%

“I have a couple of immune issues”

Magnesium3%

“Not good magnesium”

Strength3%

“strength too much”

Energy Level3%

“Haven't seen a difference in energy or anything”

Value For Money3%

“Too expensive”

Top return reasons

Functionality-Overall33%

Joint Pain33%

Color33%

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.